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A methodology for constructing the system-of-systems environment to evaluate UAV decision systems 认领 引用
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作者 Zhiqi Liu Mingqiang Luo +4 位作者 Yulu Ma Chenguang Xing Ruo Wang Daheng Chen Xiaolu Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期337-351,共15页
Evaluating Unmanned Aerial Vehicle(UAV)systems within a System-of-Systems(SoS)environment helps clarify their contribution to the overall combat capability and supports effectiveness-oriented system optimization.When ... Evaluating Unmanned Aerial Vehicle(UAV)systems within a System-of-Systems(SoS)environment helps clarify their contribution to the overall combat capability and supports effectiveness-oriented system optimization.When assessing decision systems in such an environment,cross-level modeling and simulation are required,which often face a trade-off between low modeling cost and high simulation accuracy,while the credibility of results remains challenging to ensure.To address these issues,this study proposes a hybrid-granularity Hardware-In-the-Loop(HIL)SoS environment construction method based on Graphical Evaluation and Review Technique(GERT).The method employs GERT to analyze the relationships between simulation systems,the System Under Test(SUT),and mission outcomes,thereby determining the required model precision for different systems.A dynamic resource allocation algorithm is applied to adjust model granularity on demand,ensuring high-fidelity simulation under constrained total cost.Additionally,GERT estimates the computational frequency and communication bandwidth requirements of the SUT,guiding hardware selection to enhance simulation credibility.A UAV maritime combat case study was conducted for validation.The results demonstrate that,compared to the flat modeling approach,the hybrid-granularity scenario based on GERT analysis achieves higher simulation accuracy with lower overall model complexity.The coefficient of variation in evaluation results significantly decreases in HIL simulations compared to virtual simulations,confirming improved credibility.Under the hybrid-granularity HIL scenario,the decision system was evaluated from an effectiveness perspective,identifying the most sensitive performance parameter.Subsequent targeted optimization led to an 11.90%improvement in effectiveness,validating the method's practical utility. 展开更多
关键词 System-of-systems Unmanned aerial vehicle Decision system Hardware-in-the-loop Hybrid-granularity simulation
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The complete mitochondrial genome of Aleuropteryx sinica (Neuroptera: Coniopterygidae) and its phylogenetic analysis 认领 引用
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作者 Meiyi HUANG Yu'ang LI +1 位作者 Han XU Zhiqi LIU 《Entomotaxonomia》 CSCD 2026年第1期32-41,共10页
Aleuropteryx sinica Liu&Yang,2003 is the only species of Aleuropteryx in the family Coniopterygidae found in China.In this study,we used high-throughput sequencing methods to assemble the complete mitochondrial ge... Aleuropteryx sinica Liu&Yang,2003 is the only species of Aleuropteryx in the family Coniopterygidae found in China.In this study,we used high-throughput sequencing methods to assemble the complete mitochondrial genome of A.sinica.The results showed that the complete mitogenome is 15,600 bp in length and had a high AT content(76.30%),with a typical set of 37 genes,including 13 protein-coding genes(PCGs),22 transfer RNA genes(tRNAs),2 ribosomal RNA genes(rRNAs),and 1 control region(CR)Based on the sequences of 13PCGs+2rRNAs,the phylogenetic analysis revealed that A.sinica,Coniopteryx sp.,Conwentzia sinica Yang,1974,Semidalis macleodi Meinander,1972 and Semidalis aleyrodiformis Stephens,1836 form a clade,which is a sister group to other families of Neuroptera. 展开更多
关键词 Aleuropteryinae molecular data taxonomy
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Strength Deterioration Characteristics of Soft and Hard Interbedded Rock Masses in Three Gorges Reservoir Area Induced by Wetting-Drying Cycles 认领 引用 被引量：2
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作者 Qiong Wu Di Wang +7 位作者 Huiming Tang Jintao Kang Hongming Luo Yuxin Liu Shiyu Li Bo Zhang Zhiqi Liu Zhiwei Lin 《Journal of Earth Science》 SCIE CAS CSCD 2025年第5期1948-1962,共15页
The rock masses in the hydro-fluctuation zone of reservoir banks sustain wettingdrying cycles(WDC),thereby affecting the stability of the reservoir bank slope.In this paper,rock masses with argillaceous siltstone and ... The rock masses in the hydro-fluctuation zone of reservoir banks sustain wettingdrying cycles(WDC),thereby affecting the stability of the reservoir bank slope.In this paper,rock masses with argillaceous siltstone and silty mudstone interbedded in Badong Formation were taken as the research object to investigate the variation of strength parameters of soft and hard interbedded rock masses with WDC and dip angle through laboratory experiments and numerical experiments.Some attempts were made to reveal the mechanical properties deterioration mechanism of interbedded rock masses by quantitatively analyzing the contribution of strength parameters deterioration of hard rocks,soft rocks,and bedding planes to the strength parameters deterioration of rock masses.The results indicate that the logarithmic function could be used to describe the deterioration of each strength parameter of both argillaceous siltstone and silty mudstone and bedding plane with the number of WDC.The strength parameters of interbedded rock masses decrease as the number of WDC increases,with the largest decrease after the first cycle and then slowing down in the later cycles.The strength parameters initially decrease and then increase as the dip angles increase.The impact of deteriorated strength parameters of bedding planes and rocks on the deterioration of strength parameters of interbedded rock masses differs significantly with the dip angle,which can be divided into four typical ranges of different controlling factors. 展开更多
关键词 strength deterioration wetting-drying cycles soft and hard interbedded rock mass numerical simulations contribution degree engineering geology
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Largely tunable compensation temperature in a rare-earth ferrimagnetic metal and deterministic spin-orbit torque switching for artificial neural network application 认领 引用
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作者 Li Liu Yuzhou He +13 位作者 Yifei Ma Peixin Qin Hongyu Chen Xiaoning Wang Xiaorong Zhou Ziang Meng Guojian Zhao Zhiyuan Duan Dazhuang Kang Yu Liu Shuai Ning Zhaochu Luo Qinghua Zhang Zhiqi Liu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第31期15-23,共9页
Ferrimagnets are important for next-generation high-density ultrafast spintronic device applications.Magnetization compensation temperature(TM)is a fundamentally critical magnetic parameter for ferrimagnets besides th... Ferrimagnets are important for next-generation high-density ultrafast spintronic device applications.Magnetization compensation temperature(TM)is a fundamentally critical magnetic parameter for ferrimagnets besides their Curie temperature.Around TM,the spin-orbit switching efficiencies are extraordinarily high.Therefore,the accurate manipulation of TM from the material fabrication process is essential for the electrical steering of ferrimagnetic spins.In this work,CoTb thin films,with the 3 d and 4 f magnetic sublattices antiferromagnetically coupled to each other,are deposited at different temperatures.The magnetotransport and magnetic properties of these films are systematically investigated.It was found that the TM of this rare-earth ferrimagnet largely depends on the growth temperature and it can be tuned by over 100 K.Accordingly,the spins of an optimized ferrimagnetic CoTb thin film with its TM close to room temperature can be efficiently switched by the current-pulse-induced spin-orbit torque.Moreover,an artificial neural network utilizing the spin-orbit torque device was constructed,demonstrating an image recognition accuracy of approximately 92.5%,which is comparable to that of conventional software solutions.Thus,this work demonstrates the large tunability of TM of a rare earth ferrimagnet by chemical ordering and the great potential of such a ferrimagnet for electrically operated spintronic devices. 展开更多
关键词 Ferrimagnetic metals CoTb Spin-orbit torque Compensation temperatures Artificial neural network
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Atomic insights into topochemical fluorination and strong octahedral tilt in La2CoO4 认领 引用
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作者 Yuzhou He Ting Lin +7 位作者 Shiyu Wang Ang Gao Ziang Meng Tianping Ying Zhiqi Liu Lin Gu Qinghua Zhang Binghui Ge 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第7期104-110,共7页
Topochemical fluorination introduces significant structural distortions and emerging properties in perovskite oxides via substituting oxygen with fluorine.However,the rapid fluorination process and the similarity betw... Topochemical fluorination introduces significant structural distortions and emerging properties in perovskite oxides via substituting oxygen with fluorine.However,the rapid fluorination process and the similarity between F and O render the O/F site occupation and local lattice evolution during fluorination unclear.Here we investigated the atomic-scale O/F exchange in La2CoO4and quantified the lattice distortion of three ordered structures:La2CoO3.5F,La2CoO3F2,and La2CoO2.5F3by utilizing aberration-corrected electron microscopy.Atomic-resolved elemental mapping provides direct evidence for the O/F occupancy in interstitial and apical sites.We revealed that apical F ions induce significant octahedral tilting from 178°to 165°,linearly proportional to the occupancy rate;and cause the obvious change in the fine structure O K edge,meanwhile apical O is exchanged into interstitial sites.The strong octahedral tilt leads to the in-plane elongation of the[CoO4F2]octahedra.These findings elucidate the atomic-scale mechanisms of the entire fluorination process and highlight the significant role of F in tuning the octahedral tilt of functional oxides. 展开更多
关键词 topochemical fluorination structural evolution octahedral tilting
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Experimental investigation on shear strength deterioration at the interface between different rock types under cyclic loading 认领 引用 被引量：7
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作者 Qiong Wu Zhiqi Liu +6 位作者 Huiming Tang Liangqing Wang Xiaoxue Huo Zhen Cui Shiyu Li Bo Zhang Zhiwei Lin 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第8期3063-3079,共17页
The shear strength deterioration of bedding planes between different rock types induced by cyclic loading is vital to reasonably evaluate the stability of soft and hard interbedded bedding rock slopes under earthquake... The shear strength deterioration of bedding planes between different rock types induced by cyclic loading is vital to reasonably evaluate the stability of soft and hard interbedded bedding rock slopes under earthquake;however,rare work has been devoted to this subject due to lack of attention.In this study,experimental investigations on shear strength weakening of discontinuities with different joint wall material(DDJM)under cyclic loading were conducted by taking the interface between siltstone and mudstone in the Shaba slope of Yunnan Province,China as research objects.A total of 99 pairs of similar material samples of DDJM(81 pairs)and discontinuities with identical joint wall material(DIJM)(18 pairs)were fabricated by inserting plates,engraved with typical surface morphology obtained by performing three-dimensional laser scanning on natural DDJMs sampled from field,into mold boxes.Cyclic shear tests were conducted on these samples to study their shear strength changes with the cyclic number considering the effects of normal stress,joint surface morphology,shear displacement amplitude and shear rate.The results indicate that the shear stress vs.shear displacement curves under each shear cycle and the peak shear strength vs.cyclic number curves of the studied DDJMs are between those of DIJMs with siltstone and mudstone,while closer to those of DIJMs with mudstone.The peak shear strengths of DDJMs exhibit an initial rapid decline followed by a gradual decrease with the cyclic number and the decrease rate varies from 6%to 55.9%for samples with varied surface morphology under different testing conditions.The normal stress,joint surface morphology,shear displacement amplitude and shear rate collectively influence the shear strength deterioration of DDJM under cyclic shear loading,with the degree of influence being greater for larger normal stress,rougher surface morphology,larger shear displacement amplitude and faster shear rate. 展开更多
关键词 Discontinuities with different joint wall material(DDJM) Discontinuities with identical joint wall material(DIJM) Cyclic shear test Shear strength deterioration Joint surface morphology Shear displacement amplitude Shear rate Normal stress
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Demagnetization Analysis and Velocity Tracking Control of In-wheel Motor 认领 引用
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作者 Haihong Li Junjie Chen Zhiqi Liu 《Journal of Harbin Institute of Technology(New Series)》 CAS 2024年第2期1-11,共11页
The error caused by irreversible demagnetization damages the accurate velocity tracking of an in-wheel motor in a mobile robot.A current feedforward vector control system based on ESO is proposed to compensate it for ... The error caused by irreversible demagnetization damages the accurate velocity tracking of an in-wheel motor in a mobile robot.A current feedforward vector control system based on ESO is proposed to compensate it for the demagnetization motor.A demagnetization mathematical model is established to describe a permanent magnet synchronous motor,which took the change of permanent magnet flux linkage parameters as a factor to count the demagnetization error in velocity tracking.The uncertain disturbance estimation model of the control system is built based on ESO,which eliminates the system error by the feedforward current compensation.It is compared with the vector control method in terms of control accuracy.The simulation results show that the current feedforward vector control method based on ESO reduces the velocity tracking error greatly in conditions of motor demagnetization less than 30%.It is effective to improve the operation accuracy of the mobile robot. 展开更多
关键词 mobile robot velocity tracking disturbance estimation vector control
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Three-dimensional visualization of tip-vesicles in growing pollen tubes by electron tomography 认领 引用 被引量：3
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作者 Zhiqi Liu Mengfei Liao +6 位作者 Zizhen Liang Jiayang Gao Yixin Huang Yun Xiang Tao Ni Philipp S.Erdmann Liwen Jiang 《Science China(Life Sciences)》 SCIE CSCD 2026年第1期1-16,共16页
The life cycle of flowering plants starts when a zygote is formed following a double fertilization event.To achieve fertilization,sperm cells are delivered to the female gametes within the embryo sac by the tip-growin... The life cycle of flowering plants starts when a zygote is formed following a double fertilization event.To achieve fertilization,sperm cells are delivered to the female gametes within the embryo sac by the tip-growing pollen tube.The fast-growing pollen tube is characterized and regulated by abundant transport vesicles responsible for both exocytosis and endocytosis in the tip region.Visualization of these tip-vesicles has been challenging owing to their small size,high dynamics,and complexity.In this study,we illustrated the three-dimensional(3D)ultrastructure of tip-vesicles in growing pollen tubes of lily,tobacco,and Arabidopsis.Five major types of tip-vesicles,including secretory vesicles(SVs),electron-dense vesicles(DVs),clathrin-coated vesicles(CCVs),mini vesicles(MVs),and extracellular vesicles(EVs),can be distinguished using room-temperature electron tomography(RT-ET)based on their ultrastructural features.We also demonstrated the extensive distribution of tubular endoplasmic reticulum(ER)structures at the apex of growing pollen tubes and vesicles budding from the tip-localized ER.Cryo-ET further revealed the tip-localized tubular ER with budding coat protein complex II(COPII)vesicles.Our study thus offered a structural basis for a deeper comprehension of vesicular trafficking in the tip growth of the pollen tube,aiding future research on vesicle-mediated membrane trafficking in polarized cell growth. 展开更多
关键词 pollen tube tip-vesicle electron tomography cryo-ET
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Electron microscopy-based three-dimensional subcellular imaging of plant male gametophyte 认领 引用 被引量：1
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作者 Zhiqi Liu Zizhen Liang +7 位作者 Mengfei Liao Yixin Huang Rui Ma Jiayang Gao Weiqi Wang Tao Ni Philipp S.Erdmann Liwen Jiang 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2026年第5期1290-1314,共25页
Understanding cellular events in three dimensions(3D)is of great importance for the annotation and illustration of biological processes in a contextual way.Imaging techniques based on electron microscopy(EM),such as t... Understanding cellular events in three dimensions(3D)is of great importance for the annotation and illustration of biological processes in a contextual way.Imaging techniques based on electron microscopy(EM),such as those derived from scanning electron microscopy(SEM)and transmission electron microscopy(TEM),provide various options to visualize biological samples at scales ranging from cells to macromolecules in situ.Recently,a series of cryogenic techniques has brought EM-based imaging to a new level,enabling specimens to retain their hydrated state throughout the sample preparation and imaging steps,thereby offering a near-native visualization of cellular events.The application of dual-beam focused ion beam(FIB)-SEM to biological samples has enabled high-resolution reconstructions in 3D and streamlined sample preparation workflows for downstream cryo-electron tomography(cryo-ET)imaging.However,applications of these technologies to plant materials are limited due to intrinsic characteristics of plant cells(e.g.,non-adhesive growth,large size with a central vacuole,and the presence of cell walls).For the timely application of dual-beam FIB-SEM in three-dimensional subcellular imaging of plant materials,we have recently tested and developed three major workflows with proof-of-concept evidence using developing anthers and in vitro-cultured pollen tubes based on Aquilos 2 Cryo-FIB,including(1)room-temperature FIB-SEM volume imaging,(2)cryo-lamellae preparation from cell suspension culture or high-pressure-frozen organs for cryo-ET imaging,and(3)cryo-FIB-SEM volume imaging,which will facilitate structural studies of plant materials and provide technical guidance for the broader plant cell biology research community. 展开更多
关键词 3D imaging cryo-ET cryo-lift-out dual-beam FIBSEM volume electron microscopy
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Effects of T-Factor on Quantum Annealing Algorithms for Integer Factoring Problem 认领 引用
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作者 Zhiqi Liu Shihui Zheng +2 位作者 Xingyu Yan Ping Pan Licheng Wang 《Journal of Quantum Computing》 2023年第1期41-54,共14页
The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quan... The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quantum annealing algorithms(QAA)also manifest certain advantages in factoring integers.In experimental aspects,the reported integers that were successfully factored by using the D-wave QAA platform are much larger than those being factored by using Shor-like quantum algorithms.In this paper,we report some interesting observations about the effects of QAA for solving IFP.More specifically,we introduce a metric,called T-factor that measures the density of occupied qubits to some extent when conducting IFP tasks by using D-wave.We find that T-factor has obvious effects on annealing times for IFP:The larger of T-factor,the quicker of annealing speed.The explanation of this phenomenon is also given. 展开更多
关键词 Quantum annealing algorithm integer factorization problem T-factor D-wave
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The positioning of cephalon medullary nailing correlated with hidden blood loss during the perioperative period in patients with intertrochanteric fractures:A retrospective study 认领 引用
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作者 Yao Chen Shaobo Zhang +1 位作者 Zhiqi Liu Jiashan Li 《Chinese Journal of Traumatology》 CAS CSCD 2025年第6期503-508,共6页
Purpose:Hidden blood loss(HBL)during the perioperative period significantly impacts postoperative recovery and complications,yet it is frequently disregarded.This study aimed to investigate the effects of tip-apex dis... Purpose:Hidden blood loss(HBL)during the perioperative period significantly impacts postoperative recovery and complications,yet it is frequently disregarded.This study aimed to investigate the effects of tip-apex distance(TAD)and calcar-referenced tip-apex distance(calTAD)on HBL in the treatment of intertrochanteric fractures utilizing proximal femoral nail antirotation(PFNA).The study also seeks to evaluate the possible decrease in HBL subsequent to PFNA treatment by optimizing nail positioning.Method:A historical cohort study was conducted from January 2020 to December 2022.Patients diagnosed with unilateral acute closed femoral intertrochanteric fracture and who underwent PFNA internal fixation surgery met the inclusion criteria,and were grouped according to the value of calTAD and TAD.The participants were divided into low TAD group(TAD0.05).The average HBL for the low calTAD group was 611.42 mL,whereas for the high calTAD group it was 904.97 mL(p<0.05).Subsequent analysis revealed that the patient''s height,preoperative hemoglobin levels,changes in hemoglobin and hematocrit levels from pre-to post-surgery,and calTAD are independent risk factors influencing HBL.Conclusion:In summary,our investigation revealed a significant correlation between the positioning of nails in PFNA and HBL during the perioperative period.By optimizing the placement of the cephalic nail,specifically by ensuring a calTAD of less than 7.625 mm,a significant decrease in HBL can be attained.Additionally,we identified that height,preoperative hemoglobin,differences in preoperative and postoperative hemoglobin and hematocrit,and the positioning of the cephalic nail were independent risk factors for HBL. 展开更多
关键词 Intertrochanteric fracture Proximal femoral nail antirotation Hidden blood loss Location of the cephalic nail Calcar-referenced tip-apex distance
OsMKKK70 regulates grain size and leaf angle in rice through the OsMKK4-OsMAPK6-OsWRKY53 signaling pathway 认领 引用 被引量：19
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作者 Zhiqi Liu Enyang Mei +10 位作者 Xiaojie Tian Mingliang He Jiaqi Tang Min Xu Jiali Liu Lu Song Xiufeng Li Zhenyu Wang Qingjie Guan Qijiang Xu Qingyun Bu 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2021年第12期2043-2057,共15页
Grain size and leaf angle are key agronomic traits that determine final yields in rice.However,the underlying molecular mechanisms are not well understood.Here we demonstrate that the Oryza sativa Mitogen Activated Pr... Grain size and leaf angle are key agronomic traits that determine final yields in rice.However,the underlying molecular mechanisms are not well understood.Here we demonstrate that the Oryza sativa Mitogen Activated Protein Kinase Kinase Kinase OsMKKK70 regulates grain size and leaf angle in rice.Overexpressing OsMKKK70 caused plants to produce longer seeds.The osmkkk62/70 double mutant and the osmkkk55/62/70 triple mutant displayed significantly smaller seeds and a more erect leaf angle compared to the wild type,indicating that OsMKKK70 functions redundantly with its homologs Os MKKK62 and Os MKKK55.Biochemical analysis demonstrated that OsMKKK70 is an active kinase and that OsMKKK70 interacts with Os MKK4 and promotes Os MAPK6 phosphorylation.In addition,the osmkkk62/70 double mutant showed reduced sensitivity to Brassinosteroids(BRs).Finally,overexpressing constitutively active Os MKK4,Os MAPK6,and Os WRKY53 can partially complement the smaller seed size,erect leaf,and BR hyposensitivity of the osmkkk62/70 double mutant.Taken together,these findings suggest that OsMKKK70 might regulate grain size and leaf angle in rice by activating Os MAPK6 and that OsMKKK70,Os MKK4,Os MAPK6,and Os WRKY53 function in a common signaling pathway that controls grain shape and leaf angle. 展开更多
关键词 Brassinosteroids MAPK signaling OsMKKK70 rice seed size
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Heterostructured NiS2@SnS2 hollow spheres as superior high-rate and durable anodes for sodium-ion batteries 认领 引用 被引量：7
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作者 Chongwei Li Jinchuan Hou +10 位作者 Jingyi Zhang Xiaoyue Li Shiqi Jiang Guoqing Zhang Zhujun Yao Tiancun Liu Shenghui Shen Zhiqi Liu Xinhui Xia Jie Xiong Yefeng Yang 《Science China Chemistry》 SCIE EI CAS CSCD 2022年第7期1420-1432,共13页
Tin-based sulfides have attracted increasing attention as anodes for sodium-ion batteries(SIBs) owing to their high theoretical capacity;however, the poor rate capability and inferior cycling stability caused by the l... Tin-based sulfides have attracted increasing attention as anodes for sodium-ion batteries(SIBs) owing to their high theoretical capacity;however, the poor rate capability and inferior cycling stability caused by the low electrical conductivity, sluggish kinetics and drastic volume variations during cycling have greatly hampered their practical applications. Herein, heterostructured NiS2@SnS2 hybrid spheres were delicately designed and constructed by anchoring interconnected SnS2 nanosheets on metalorganic frameworks(MOFs)-derived Ni S2 hollow spheres coupled with N-doped carbon skeleton through facile solvothermal and sulfurization/carbonization processes. The unique hollow heterostructure with highly conductive carbon matrix can effectively facilitate the charge transfer kinetics and ensure the desired buffer space while endowing more active sites and enhanced structural integrity, as demonstrated by the experimental and density functional theory(DFT) results. Benefitting from these merits, the NiS2@SnS2 hybrid composite displays a high reversible capacity of 820 m Ah g-1 after 250 cycles at 1 A g-1, and retains a value of 673 m Ah g-1after 1,300 cycles at 5 A g-1, manifesting the excellent high-rate and durable sodium storage behaviors when applied in SIBs. This study shall shed more light on the fabricating and interface engineering of other transition metal-based composite anodes for high-performance SIBs. 展开更多
关键词 anode metal-organic frameworks heterostructure bimetallic sulfide sodium ion battery
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Emergent ultra-high temperature ferromagnetism in La2CoO4±x thin films 认领 引用 被引量：2
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作者 Ziang Meng Han Yan +13 位作者 Peixin Qin Zhuo Yin Peiheng Jiang Xiaorong Zhou Xiaoning Wang Hongyu Chen Li Liu Zhiyuan Duan Guojian Zhao Weisheng Zhao Fengxia Hu Qinghua Zhang Zhicheng Zhong Zhiqi Liu 《Nano Research》 SCIE EI CSCD 2024年第8期7250-7255,共6页
Searching for novel ferromagnetic oxides with high Curie temperature(TC)has been one of the main goals for oxide spintronics.The well-known perovskite cobaltate LaCoO3 is a classical ferromagnet in its thin-film fo... Searching for novel ferromagnetic oxides with high Curie temperature(TC)has been one of the main goals for oxide spintronics.The well-known perovskite cobaltate LaCoO3 is a classical ferromagnet in its thin-film form;however,it suffers from a low TC(~85 K).Here we report a new type of ferromagnetic La-Co-O films with an ultrahigh TC of~820 K.They are fabricated by pulsed laser deposition from a LaCoO3 target at low oxygen partial pressures.Detailed structural analysis indicates that they crystallize in terms of the Ruddlesden–Popper phase of La2CoO4±x.In sharp contrast to the antiferromagnetism of bulk La2CoO4,the strong ferromagnetism in the La2CoO4±x thin films is firmly demonstrated by magnetometry measurements,X-ray magnetic circular dichroism characterization,and magnetotransport experiments.More importantly,density functional theory calculations indicate that the nonstoichiometric oxygen induces an antiferromagnetic-to-ferromagnetic phase transition,accompanied by the orbital reconstruction of Co 3d electrons.Thus,our study provides an attractive strategy for designing or synthesizing exotic magnetic oxides with high ordering temperatures. 展开更多
关键词 ferromagnetic oxides ultra-high Curie temperature La2CoO4 spin current transport oxygen engineering
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Morphology evolution of SmCox permanent magnetic nanoparticles 认领 引用 被引量：2
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作者 Ying Dong Hui Wang +5 位作者 BingJie Liu Xin Liu JiaXiang Shang ZhiQi Liu TianLi Zhang ChengBao Jiang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2021年第4期104-110,共7页
Sm-Co nanoparticles (NPs) are promising candidates for preparing superstable magnets and exchange-coupled nanocomposite magnets with unprecedented magnetic properties.However,the morphology evolution of the NPs remain... Sm-Co nanoparticles (NPs) are promising candidates for preparing superstable magnets and exchange-coupled nanocomposite magnets with unprecedented magnetic properties.However,the morphology evolution of the NPs remains unclear.Here,single crystalline SmCox(x=4.07,4.79,6.94,and 8.61) NPs with dimensions below the critical size of a single magnetic domain were synthesized.These NPs consist of Sm2Co7,SmCo5,and Sm2Co17phases with divergent typical morphologies.An evolution model for the different morphological characteristics was proposed based on phase-structure changes and surface-energy calculations using the density functional theory.The results show that these SmCo4.79 NPs can be well aligned along the easy magnetization axis and exhibit an ultrahigh coercivity of 5.7 T,thus enabling to advance the control of NP morphology and to facilitate their use in superstable or nanocomposite magnets. 展开更多
关键词 Sm-Co permanent magnet nanoparticles morphology evolution ultrahigh coercivity
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