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Magnetization-Induced Higher-Order Topological Effects in Quantum Spin Hall Insulators 认领 引用
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作者 Xiang-Long Yu Jie Wang +2 位作者 Pei-Hao Fu Da-Yong Liu Dao-Xin Yao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期135-138,I0106-I0114,共4页
Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order top... Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order topological states in a rhombic geometry of two-dimensional group-IVA materials subjected to external magnetic fields,described by a modified Kane-Mele model with next-nearest-neighbor Rashba spin-orbit coupling.We identify two distinct types of corner modes governed by different physical mechanisms:under out-ofplane magnetization,corner states emerge at the acute angles due to boundary hybridization induced by spin-orbit coupling,whereas under in-plane magnetization,corner modes appear at the obtuse angles as topologically protected Jackiw-Rebbi solitons arising at the domain wall between boundaries with different topological invariants.Using first-principles-based parameters for realistic materials including silicene,germanene,and stanene,we show that the obtuse-angle corner states are robust and enhanced in systems with stronger spin-orbit coupling.Our results establish a feasible route for magnetically creating and controlling higher-order topological states,enabling reconfigurable corner-mode-based topological devices. 展开更多
关键词 corner modes external magnetic fieldsdescribed identify two distinct types corner modes external magnetic fields physical mechanisms magnetization quantum spin hall insulators experimentally accessible control schemeshere
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Manufacturing novel Fe-based nanocrystalline powders with high saturation magnetization and low core loss by gas atomization 认领 引用
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作者 Yanqiu Li Ling Zhang +4 位作者 Xingjie Jia Yaqiang Dong Aina He Jiawei Li Baogen Shen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2026年第1期182-189,共8页
Fe-based nanocrystalline powders are ideal soft magnetic materials for matching the wide bandgap semiconductors.Previously developed Fe-based nanocrystalline alloys are difficult to produce high-quality precursor powd... Fe-based nanocrystalline powders are ideal soft magnetic materials for matching the wide bandgap semiconductors.Previously developed Fe-based nanocrystalline alloys are difficult to produce high-quality precursor powder by gas atomization due to their poor amorphous forming ability,and their following nanocrystallizations also require high temperatures or heating rates.In present work,we invented novel high-performance Fe-based nanocrystalline powders that can be directly manufactured by gas atomization without annealing.The as-atomized Fe73.3Si12B13Cu1.7nanocrystalline powders exhibit fine α-Fe(Si)crystals with an average size of 15.1 nm and high saturation magnetization(Ms)of 156.2 emu/g.The Fe73.3Si12B13Cu1.7soft magnetic powder cores annealed at 480℃for 60 min process high effective permeability of 35.9 and low core losses(50 mT/100 kHz)of 310.1 mW/cm3.These outstanding magnetic properties and good processability make the developed Fe73.3Si12B13Cu1.7nanocrystalline powders highly promising for high-performance inductors and transformers. 展开更多
关键词 Fe-based nanocrystalline alloys High Cu content Gas atomization Saturation magnetization Core loss
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Uncovering the Magnetization Multipolar Anisotropy of the Anomalous Hall Effect in Conventional Ferromagnets 认领 引用
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作者 Wenzhi Peng Zheng Liu +10 位作者 Haolin Pan Peng Wang Yulong Chen Jiachen Zhang Xuhao Yu Jinhui Shen Mingmin Yang Jiahao Han Qian Niu Yang Gao Dazhi Hou 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期67-72,I0070-I0084,共6页
The anomalous Hall effect(AHE)in ferromagnets is conventionally described by a dipolar relation between the anomalous Hall conductivity and the magnetization,which enforces their parallel alignment and thus forbids a ... The anomalous Hall effect(AHE)in ferromagnets is conventionally described by a dipolar relation between the anomalous Hall conductivity and the magnetization,which enforces their parallel alignment and thus forbids a Hall signal when the magnetization lies within the Hall plane.Here,by systematically measuring the AHE under in-plane magnetization in Fe and Ni,we uncover a multipolar anisotropy of the AHE that produces a finite in-plane anomalous Hall response in Fe(103)and Ni(111),while it vanishes in Fe(001)as dictated by crystal symmetry.The angular dependence of the in-plane AHE in Fe(103)and Ni(111)further deviates from the familiar sinusoidal form expected from dipolar behavior,revealing symmetry-allowed higher-order multipolar contributions.First-principles calculations quantitatively reproduce the experimentally extracted dipolar and octupolar coefficients for Fe,demonstrating that intrinsic Berry curvature carries a sizable multipolar anisotropy in conventional cubic ferromagnets. 展开更多
关键词 anomalous hall effect ahe dipolar relation magnetization parallel alignment anomalous hall conductivity hall signal anomalous hall effect multipolar anisotropy
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Room-temperature sensitive electromechanical magnetization reversal with modulation capability approaching 100% 认领 引用
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作者 Mingliang Cheng Jianzhao Wang +6 位作者 Yiting Mo Yijun Huang Xinghao Qu Senjiang Yu Liang Hu Xinglong Dong Xuefeng Zhang 《Science China Materials》 SCIE EI CAS CSCD 2026年第8期4945-4953,共9页
Developing efficient strategies for electrically manipulating two-dimensional magnetism at room temperature is a key challenge in contemporary spintronics.In this study,we demonstrate giant electromechanical control o... Developing efficient strategies for electrically manipulating two-dimensional magnetism at room temperature is a key challenge in contemporary spintronics.In this study,we demonstrate giant electromechanical control over the magnetism of the room-temperature van der Waals ferromagnet Fe3GaTe2by integrating it with the ferroelectric aIn2Se3.Modest gate voltages lead to an almost complete suppression of the coercive field by 96.5%,corresponding to a remarkable peak modulation sensitivity of~8.1 mT V-1,which stands out among existing van der Waals magnetoelectric systems.Importantly,this substantial magnetoelectric response is predominantly unaffected by voltage polarity,as both positive and negative gate voltages induce similar magnetic modulation effects.To elucidate the underlying mechanism,we tracked the voltage-induced Raman spectral changes,revealing a peak shift of 1.7 cm1 that accurately represents an effective in-plane tensile strain of~1.42%under an equivalent bias,demonstrating polarity independence as well.The synchronized magnetic response and strain variation unequivocally indicate that the induced tensile strain serves as the fundamental physical driver behind the magnetic modulation.Additionally,density functional theory calculations corroborate that the reduction in magnetic anisotropy induced by tensile strain results in a decrease in the coercive field.Our work establishes a novel and efficient approach for achieving voltage control of magnetism at room temperature in van der Waals multiferroic heterostructures,highlighting their significant potential for applications in ultra-low-power magnetic logic and sensing technologies. 展开更多
关键词 van der Waals magnet multiferroic heterostructure electromechanical coupling electric-field control of magnetism magneto-optical Kerr effect
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Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements 认领 引用 被引量：2
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作者 ShiDa Sun Hui Li +3 位作者 JinSong Du Pan Zhang Chao Chen PengFei Liu 《Earth and Planetary Physics》 EI CSCD 2025年第3期653-666,共14页
The lithospheric magnetic field is an important component of the geomagnetic field,and the oceanic lithosphere exhibits distinct characteristics.Because of its formation mechanisms,evolutionary history,and geomagnetic... The lithospheric magnetic field is an important component of the geomagnetic field,and the oceanic lithosphere exhibits distinct characteristics.Because of its formation mechanisms,evolutionary history,and geomagnetic field polarity reversals,the oceanic lithosphere has significant remanent magnetization,which causes magnetic anomaly stripes parallel to the mid-ocean ridges.However,it is difficult to construct a high-resolution lithospheric magnetic field model in oceanic regions with relatively sparse data or no data.Using forward calculated lithospheric magnetic field data based on an oceanic remanent magnetization(ORM) model with physical and geological foundations as a supplement is a feasible approach.We first collect the latest available oceanic crust age grid,plate motion model,geomagnetic polarity timescale,and oceanic lithosphere thermal structure.Combining the assumptions that the paleo geomagnetic field is a geocentric axial dipole field and that the normal oceanic crust moves only in the horizontal direction,we construct a vertically integrated ORM model of the normal oceanic crust with a known age,including the intensity,inclination,and declination.Both the ORM model and the global induced magnetization(GIM) model are then scaled from two aspects between their forward calculated results and the lithospheric magnetic field model LCS-1.One aspect is the difference in their spherical harmonic power spectra,and the other is the misfit between the grid data over the oceans.We last compare the forward calculated lithospheric magnetic anomaly from the scaled ORM and GIM models with the Macao Science Satellite-1(MSS-1) observed data.The comparison results show that the magnetic anomalies over the normal oceanic crust regions at satellite altitude are mainly contributed by the high-intensity remanent magnetization corresponding to the Cretaceous magnetic quiet period.In these regions,the predicted and observed anomalies show good consistency in spatial distribution,whereas their amplitude differences vary across regions.This result suggests that regional ORM construction should be attempted in future work to address these amplitude discrepancies. 展开更多
关键词 oceanic remanent magnetization lithospheric magnetic field LCS-1 Macao Science Satellite-1
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In-situ reduction mechanism of hematite by bastnaesite during suspension magnetization roasting 认领 引用 被引量：2
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作者 Wen-bo LI Shao-kai CHENG +1 位作者 Rui QU Ji-jia CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第3期965-974,共10页
To explore the spontaneous magnetization of iron-bearing rare earth ores during suspension roasting,binary minerals containing hematite and bastnaesite were used to investigate the effects of the roasting temperature,... To explore the spontaneous magnetization of iron-bearing rare earth ores during suspension roasting,binary minerals containing hematite and bastnaesite were used to investigate the effects of the roasting temperature,roasting time,and bastnaesite-to-hematite mass ratio on in-situ reduction of hematite in a N2atmosphere.Relevant analytical tests were used to explore the mineral phase evolution during roasting,the magnetism and microstructure of the roasted products,the phase composition,and the surface element valence of concentrate.It was found that magnetic separation of the iron concentrate afforded an iron grade of 68.87%and a recovery of 93.18%under the optimum roasting conditions.During roasting,bastnaesite decomposed to generate CO2and CO,and the compact structure of hematite was gradually destroyed,resulting in microcracks.Subsequently,the CO entered the surface of the hematite through the microcracks and reacted to form a magnetite shell,and the magnetite-encapsulated hematite particles were recovered via low-intensity magnetic separation. 展开更多
关键词 bastnaesite hematite magnetization roasting in-situ reduction
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Ultralow-Vertical-Current Magnetization Switching Effect in an All Van Der Waals 2D Heterostructure 认领 引用
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作者 Hao Wu Li Yang +6 位作者 Gaojie Zhang Wen Jin Jie Yu Bichen Xiao Ahmed Annas Wenfeng Zhang Haixin Chang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第2期239-248,共10页
The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in spintronics.It has formed the foundation for data storage and next-generation computing system... The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in spintronics.It has formed the foundation for data storage and next-generation computing systems.Spin-transfer torque(STT)and spin-orbit torque(SOT)have emerged as prominent mechanisms in current-driven magnetization switching.However,these approaches typically require critical current densities in the range of 106 to 109 A·cm-2,resulting in significant heat generation during data writing processes.Herein,we report the discovery of an ultralow-vertical-current magnetization switching effect in a van der Waals ferromagnetic/ferroelectric heterostructure based on the modulation of the critical magnetic field(HC)using small vertical currents,with a critical current density as low as 1.81A·cm-2 and an average effective field(Heff/JC)as high as 150.3mT·A-1·cm2.This unique magnetization switching effect with ultralow-critical-vertical-current densities typically six to nine orders of magnitude lower than those of the STT and SOT provides a new transformative and viable pathway for developing next-generation spintronic and quantum technologies. 展开更多
关键词 magnetization critical typically
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Influence of cooling atmosphere on the structure,magnetization,and dielectric properties of CaBaCo4O7 认领 引用
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作者 Gaoshang Gong Minghao Wang +4 位作者 Ruoshui Liu Yang Wu Lichen Wang Yongqiang Wang Baogen Shen 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第4期585-589,共5页
CaBaCo4O7has been widely studied because of its distinctive structure and magnetic properties.This study examined the influence of different cooling atmospheres on the structure,magnetic properties,and dielectri... CaBaCo4O7has been widely studied because of its distinctive structure and magnetic properties.This study examined the influence of different cooling atmospheres on the structure,magnetic properties,and dielectric behavior of CaBaCo4O7.Samples were cooled under different atmospheric conditions to assess these influences.Our findings indicate that reduced oxygen content leads to increased lattice distortion.Since oxygen atoms play a crucial role in mediating magnetic exchange,oxygen deficiency disrupts long-range magnetic order and promotes short-range antiferromagnetic interactions.Additionally,the cooling atmosphere significantly impacts grain size,thereby affecting the dielectric constant and dielectric loss.In the argon-cooled CaBaCo4O7(Ar)sample,oxygen deficiency reduced dielectric permittivity and increased dielectric loss. 展开更多
关键词 CaBaCo4O7 cooling atmosphere magnetization dielectric
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Nature of the 1/3 Magnetization Plateau in Spin-1/2 Kagome Antiferromagnets 认领 引用 被引量：1
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作者 Li-Wei He Xinzhe Wang +1 位作者 Shun-Li Yu Jian-Xin Li 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第9期163-168,共6页
We investigate the origin of the 1/3 magnetization plateau in the S=1/2 kagome antiferromagnetic Heisenberg model using the variational Monte Carlo and exact diagonalization methods,to account for the recent experimen... We investigate the origin of the 1/3 magnetization plateau in the S=1/2 kagome antiferromagnetic Heisenberg model using the variational Monte Carlo and exact diagonalization methods,to account for the recent experimental observations in YCu3(OH)6+xBr3-xand YCu3(OD)6+xBr3-x.We identify three degenerate valencebond-solid(VBS)states forming a√3×√3 unit cell.These states exhibit David-star patterns in the spin moment distribution with only two fractional values-1/3 and 2/3,and are related through translational transformations.While the spin correlations in these VBS states are found to be short-range,resembling a quantum spin liquid,we show that they have a vanishing topological entanglement entropy and thus are topologically trivial many-body states.Our theoretical results provide strong evidence that the 1/3 magnetization plateau observed in recent experiments arises from these√3×√3 VBS states with fractional spin moments. 展开更多
关键词 kagome antiferromagnetic heisenberg model variational monte carlo spin moment distribution valencebond solid states exact diagonalization magnetization plateau spin kagome antiferromagnets exact diagonalization methodsto
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Extrinsic negative magnetization and exchange bias of FePS3(CoCp2)0.40 认领 引用
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作者 Zhixin Liu Wei Shi +6 位作者 Na Li Yilin Pei Liyuan Song Qiuping Huang Zhengping Fu Jianlin Wang Yalin Lu 《Journal of University of Science and Technology of China》 CAS CSCD 北大核心 2025年第12期1-10,I0001,共10页
Van der Waals(vdW)crystals,particularly transition metal phosphorus trisulfides(MPX3),have garnered significant attention because of their tunable magnetic properties through intercalation.This study investigated t... Van der Waals(vdW)crystals,particularly transition metal phosphorus trisulfides(MPX3),have garnered significant attention because of their tunable magnetic properties through intercalation.This study investigated the magnetic behavior of FePS3 intercalated with cobaltecene ions(FePS3(CoCp2)0.40),focusing on its negative magnetization(NM)and exchange bias(EB)effects.Structural analysis reveals an expansion of the interlayer spacing from 6.46Å to 11.95Å and the emergence of spontaneous magnetization below 65 K.A robust NM is observed below~35 K under zero-field cooling(ZFC),even at high magnetic fields.Detailed investigations demonstrate that this ZFC-NM arises from a combination of a negative trapped field in the superconducting magnet and the material’s giant coercive force rather than an intrinsic magnetic mechanism.Furthermore,the apparent EB effect,often misinterpreted as intrinsic,is attributed to a secondary minorloop effect rather than genuine EB.By systematically excluding external influences,the study confirms that FePS3(CoCp2)0.40 has no intrinsic NM or EB.This work provides a critical methodology to distinguish extrinsic from intrinsic magnetic phenomena in high-coercivity materials,advancing the understanding of vdW magnetism and its applications in spintronic devices. 展开更多
关键词 FePS3 intercalation negative magnetization exchange bias trapped field
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Elevated temperature magnetic microstructures and demagnetization mechanism for grain boundary diffused dual-main-phase(Nd,Ce)-Fe-B magnets 认领 引用 被引量：7
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作者 Yifei Xiao Lele Zhang +7 位作者 Wei Yang Tao Liu Qisong Sun Xiaolong Song Yikun Fang Anhua Li Minggang Zhu Wei Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第4期10-23,共14页
The combination of dual-main-phase(DMP)(Nd,Ce)-Fe-B magnets and grain boundary diffusion process(GBDP)is currently a research topic for obtaining high-cost performance materials in rare earth permanent magnet fields.T... The combination of dual-main-phase(DMP)(Nd,Ce)-Fe-B magnets and grain boundary diffusion process(GBDP)is currently a research topic for obtaining high-cost performance materials in rare earth permanent magnet fields.The novel structural features of GBDP(Nd,Ce)-Fe-B magnets give a version of different domain reversal processes from those of non-diffused magnets.In this work,the in-situ magnetic domain evolution of the DMP magnets was observed at elevated temperatures,and the temperature demagnetization and coercivity mechanism of the GBDP dual-main-phase(Nd,Ce)-Fe-B magnets are discussed.The results show that the shell composition of different types of grains in DMP magnets is similar,while the magnetic microstructure results indicate the Ce-rich grains tend to demagnetize first.Dy-rich shell with a high anisotropic field caused by GBDP leads to an increase in the nucleation field,which enhances the coercivity.It is found that much more grains exhibit single domain characteristics in the remanent state for GBDP dual-main-phase(Nd,Ce)-Fe-B magnets.In addition,the grains that undergo demagnetization first are Ce-rich or Nd-rich grains,which is different from that of non-diffused magnets.These results were not found in previous studies but can be intuitively characterized from the perspective of magnetic domains in this work,providing a new perspective and understanding of the performance improvement of magnetic materials. 展开更多
关键词 Magnetic microstructures Dual-main-phase (Nd,Ce)-Fe-B Diffused Dy Rare earth permanent magnet materials Grain boundary diffusion process(GBDP)
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Modification of slow relaxation of magnetization behavior via substituent change on two neutral mononuclear dysprosium(Ⅲ) single-molecule magnets 认领 引用
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作者 Leilei Li Libo Zhang +4 位作者 Anzhi Huang Shuang Liu Wenzhen Wang Hongjiang Yu Yiquan Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第9期1901-1908,共8页
Structural fine-tuning is of significant importance to enhance the magnetic anisotropy and elucidate the magneto-structural relationship for single molecule magnets(SMMs).For this purpose,two mononuclear Dy3+ SMMs:... Structural fine-tuning is of significant importance to enhance the magnetic anisotropy and elucidate the magneto-structural relationship for single molecule magnets(SMMs).For this purpose,two mononuclear Dy3+ SMMs:[Dy{HB(pz)3}2(Sal)](1) and [Dy{HB(pz)3}2(MeO-Sal)](2),where HB(pz)3-represents hydro tris(pyrazolyl)borate,Sal denotes salicyiaidehyde and MeO-Sal stands for 5-methoxysalicylaldehyde,were designed and synthesized.Single crystal X-ray diffraction tests show that the two SMMs have very similar eight-coordinated molecule structures,although the introducing of-MeO substituent on salicyiaidehyde ligand induces the changes on the molecule packing mode and the space group.Both the two SMMs have a Dy-Oaryloxidebond that is significantly shorter than other Dy-O/N bonds,which defines the orientation of main anisotropy axis of the ground Kramers doublets and engenders the slow relaxation of the magnetization behavior,as evidenced by the magnetic susceptibility and the ab initio calculation.Though with an electron-donating substituent on the axial Sal ligand in 2,the collective magnetic anisotropy is not enhanced and the corresponding magneto-structural relationship is discussed based on the experimental and theoretical calculation results.In addition,as neutral molecules,1 and 2 are soluble in several common organic solvents,like CH2Cl2,CHCl3,THF and so on. 展开更多
关键词 Dysprosium Rare earths Single molecule magnet Magnetic property Magnetic anisotropy Slow magnetic relaxation
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High-frequency complex permeability calculation for metallic soft magnetic particles with easy magnetization plane in non-magnetic medium 认领 引用
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作者 Liangrui Tan Donglin He +5 位作者 Zhibiao Xu Guowu Wang Shengyu Yang Shaoyong Leng Ruilong Li Tao Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第11期254-261,共8页
Soft magnetic composites made from metallic magnetic particles with an easy magnetization plane(referred to as easy-plane metallic soft magnetic composites(SMC))are considered ideal materials for the next generation o... Soft magnetic composites made from metallic magnetic particles with an easy magnetization plane(referred to as easy-plane metallic soft magnetic composites(SMC))are considered ideal materials for the next generation of power electronic devices.This advantage is attributed to their ability to maintain high permeability at elevated frequencies.Despite these advantages,a definitive mathematical model that connects the high-frequency magnetic properties(e.g.,effective permeability)of easy-plane metallic SMCs to the intrinsic properties of the particles is still lacking.In this work,a theoretical calculation model for the effective permeability of easy-plane metallic SMCs was formulated.This model was derived from a skin effect-corrected Landau-Lifshitz-Gilbert(LLG)equation and integrated with effective medium theory incorporating inter-particle interaction.To validate the model,we prepared samples of easy-plane Y2Co17particle/PU SMCs with varying particle sizes and volume fractions.The experimental results showed a strong agreement with the calculated values.This research offers critical theoretical backing for the design and optimization of soft magnetic materials intended for high-frequency applications. 展开更多
关键词 easy-plane material high-frequency soft magnetic composites complex permeability Landau-Lifshitz-Gilbert(LLG)equation
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Effects of Magnetization of Background Ions on Wave Spectra of 2D Complex Plasma 认领 引用
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作者 Zhang Hui Zhang Lanxin +2 位作者 Sun Shulin Yang Fang Kong Wei 《南开大学学报（自然科学版）》 CAS CSCD 北大核心 2025年第1期22-33,共12页
The longitudinal and transverse waves of 2D magnetized complex plasma based on the drivendissipative Langevin dynamics simulation are investigated.The modified Yukawa potential with including the magnetization of back... The longitudinal and transverse waves of 2D magnetized complex plasma based on the drivendissipative Langevin dynamics simulation are investigated.The modified Yukawa potential with including the magnetization of background ions is used to account for the interaction of the charged dust particles.The simulation results are compared with the existing theories including quasilocalized charge approximation and randomphase approximation.In the weak magnetization regime,the wave spectra obtained from Yukawa simulation and modified Yukawa simulation basically are the same.In the strong magnetization regime,the magnetization of background ions and temperature ratio of background electrons to background ions play effects on the wave spectra of the system,particularly for the strongly coupled state.The dust acoustic waves in the weakly coupled state basically are not influenced by the magnetization of background ions. 展开更多
关键词 wave spectrum dusty plasma magnetic field
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Multiple modes of perpendicular magnetization switching scheme in single spin-orbit torque device 认领 引用 被引量：1
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作者 Tong-Xi Liu Zhao-Hao Wang +4 位作者 Min Wang Chao Wang Bi Wu Wei-Qiang Liu Wei-Sheng Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第10期283-287,共5页
Spin-orbit torque(SOT)has been considered as one of the promising technologies for the next-generation magnetic random access memory(MRAM).So far,SOT has been widely utilized for inducing various modes of magnetizatio... Spin-orbit torque(SOT)has been considered as one of the promising technologies for the next-generation magnetic random access memory(MRAM).So far,SOT has been widely utilized for inducing various modes of magnetization switching.However,it is a challenge that so many multiple modes of magnetization switching are integrated together.Here we propose a method of implementing both unipolar switching and bipolar switching of the perpendicular magnetization within a single SOT device.The mode of switching can be easily changed by tuning the amplitude of the applied current.We show that the field-like torque plays an important role in switching process.The field-like torque induces the precession of the magnetization in the case of unipolar switching,however,the field-like torque helps to generate an effective zcomponent torque in the case of bipolar switching.In addition,the influence of key parameters on the mode of switching is discussed,including the field-like torque strength,the bias field,and the current density.Our proposal can be used to design novel reconfigurable logic circuits in the near future. 展开更多
关键词 spin-orbit torque(SOT) field-like torque magnetization switching perpendicular magnetization
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Mechanism for suspension magnetization roasting of iron ore using straw-type biomass reductant 认领 引用 被引量：17
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作者 Yue Cao Yongsheng Sun +2 位作者 Peng Gao Yuexin Han Yanjun Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第6期1075-1083,共9页
As an alternative reductant for fossil fuel in the future,straw-type biomass contributes to emission reduction and green utilization in the suspension roasting process.In this study,the influences of the roasting time... As an alternative reductant for fossil fuel in the future,straw-type biomass contributes to emission reduction and green utilization in the suspension roasting process.In this study,the influences of the roasting time,roasting temperature and dose of straw-type biomass after suspension magnetization roasting(SMR) and separation were investigated.The optimal conditions were determined to be a roasting time of 7.5 min with a straw-type biomass dose of 20 wt% and a roasting temperature of 800℃ in which an iron grade of 71.07% and recovery of 94.17% were obtained for the iron concentrate.The maximum saturation magnetization under optimal conditions was 35.05 A·m2·g-1,and the gaseous regulation of the biomass revealed that cumulative reducing gas volume was 293.93 mL at the optimal roasting time of450 s.The transformation of hematite to magnetite was detected by X-ray diffraction(XRD).During microstructure evolution,the outer layer consisting of fissures and tiny holes continuously deepened toward the core. 展开更多
关键词 Straw-type biomass Suspension magnetization roasting Phase conversation Gases analyses Microstructure evolution
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Application of suspension magnetization roasting as technology for high-efficiency separation of valuable iron minerals from high-iron bauxite 认领 引用 被引量：16
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作者 Ruo-feng WANG Shuai YUAN +1 位作者 Peng GAO Yan-jun LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第7期2391-2402,共12页
A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery.The optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 m... A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery.The optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 min,a CO concentration of 20%,and particles with a size less than 37μm accounting for 67.14%of the roasted product.The total iron content and iron recovery of the magnetic concentrate were 56.71%and 90.50%,respectively.The phase transformation,magnetic transition,and microstructure evolution were systematically characterized through iron chemical phase analysis,X-ray diffraction,vibrating sample magnetometry,X-ray photoelectron spectroscopy,and transmission electron microscopy.The results demonstrated the transformation of hematite to magnetite,with the iron content in magnetite increasing from 0.41%in the raw ore to 91.47%in the roasted product. 展开更多
关键词 high-iron bauxite suspension magnetization roasting comprehensive utilization magnetic separation phase transformation
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Mechanism of microwave assisted suspension magnetization roasting of oolitic hematite ore 认领 引用 被引量：11
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作者 ZHOU Wen-tao SUN Yong-sheng +2 位作者 HAN Yue-xin GAO Peng LI Yan-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期420-432,共13页
Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roa... Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore.The results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic separation.Moreover,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,respectively.Microwave pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m2)/kg and the saturation susceptibility from 0.179×10−3 m3/kg to 0.283×10−3 m3/kg.Microcracks were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment time.The reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite. 展开更多
关键词 oolitic hematite microwave suspension magnetization roasting phase and magnetic transformation microstructure evolution
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Effect of heterogeneous microstructure on magnetization reversal mechanism of hot-deformed Nd-Fe-B magnets 认领 引用 被引量：5
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作者 Yuqing Li Xiaochang Xu +3 位作者 Ming Yue Dan Wu Weiqiang Liu Dongtao Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第10期1088-1095,共8页
The hot-deformed(HD) Nd-Fe-B magnets show heterogeneous microstructure composed of coarse and fine grain regions. It is significant to fully understand the influence of this complex microstructure on the magnetization... The hot-deformed(HD) Nd-Fe-B magnets show heterogeneous microstructure composed of coarse and fine grain regions. It is significant to fully understand the influence of this complex microstructure on the magnetization reversal process which can give the guidance for the enhancement of the magnetic properties. In this paper, the heterogeneous microstructure of the(HD) Nd-Fe-B magnets were characterized from the morphology, size, macro-texture and micro-structure. In addition, the magnetization reversal process of the HD Nd-Fe-B magnets was systematically analyzed by magnetic measurement, insitu domain evolution observation and micromagnetic simulation. The results indicate that the HD NdFe-B magnets mainly consist of fine grain regions(FGRs) and coarse grain regions(CGRs). The FGRs show plate-like grains with fine grain size and strong c-axis texture, while the CGRs show equiaxial grains with large grain size and weak c-axis texture. In particular, it is worth noting that the texture in homogeneity exists not only between FGRs and CGRs, but also inside both the FGRs and CGRs. The dominant coercivity mechanism of the HD Nd-Fe-B magnets is domain wall pinning. Also, the experimental analysis shows that the reverse domain is formed and expanded in the CGRs at low reverse applied field, while the reverse domain occurs in the FGRs at higher reverse applied field. The micromagnetic simulation results also confirm the above magnetization reversal process. In addition, micromagnetic simulation results also show that the orientation of the grains also affects the pinning strength, besides the grain size. 展开更多
关键词 Hot-deformed Nd-Fe-B magnet Heterogeneous microstructure Magnetization reversal Coercivity mechanism Rare earths
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The Impact Induced DemagnetizationMechanism in NdFeB Permanent Magnets 认领 引用 被引量：8
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作者 LI Yan-Feng ZHU Ming-Gang +6 位作者 LI Wei ZHOU Dong LU Feng CHEN Lang WU Jun-Ying QI Yan DU An 《Chinese Physics Letters》 SCIE EI CAS CSCD 2013年第9期153-156,共4页
Compression of unmagnetized Nd2Fe14B permanent magnets is executed by using shock waves with different pressures in a one-stage light gas gun system.The microstructure,crystal structure,and magnetic properties o... Compression of unmagnetized Nd2Fe14B permanent magnets is executed by using shock waves with different pressures in a one-stage light gas gun system.The microstructure,crystal structure,and magnetic properties of the magnets are examined with scanning electronic microscopy,x-ray diffraction,hysteresis loop instruments,and a vibrating sample magnetometer,respectively.The NdFeB magnets display a demagnetization phenomenon after shock wave compression.The coercivity dropped from about 21.4kOe to 3.2kOe.The critical pressure of irreversible demagnetization of NdFeB magnets should be less than 4.92GPa.The coercivity of the NdFeB magnets compressed by shock waves could be recovered after annealing at 900℃and 520℃for 2h,sequentially.The chaotic orientation of Nd2Fe14B grains in the compressed magnets is the source of demagnetization。 展开更多
关键词 NdFeB magnetization magnets
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