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Experimental observation of topological Hall effects in compensated ferrimagnet-heavy metal layered structures

Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 98-106页

作者： Zheng-Yu Xiao Zhi-Yong Quan Wei Zhang Dong Li Hui-Hui Liu Guo-Wei Zhou Jun Zhang Fei Zhang Xia Liu Xiao-Hong Xu Ming-Zhong Wu Key Laboratory of magnetic Molecules and magnetic Information materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityLinfen 041004China Research Institute of materials Science Shanxi Normal UniversityLinfen 041004China Collaborative Innovation center for Shanxi Advanced Permanent magnetic materials and Technology Linfen 041004China Department of Physics Colorado State UniversityFort CollinsColorado 80523USA

The topological Hall effect(THE) as a powerful probe for the experimental observation of topological spin textures, such as magnetic skyrmions, has been observed in a wide variety of distinct material systems. However, limited experimental observations have been reported for antiferromagnetic(AFM) materials. Here, the THE signals in the AFM state were observed in compensated ferrimagnetic thin films interfaced with heavy metals at the magnetization compensation temperature(TM).Ferrimagnetic CoTb thin films grown on Pt thin films were used in the experiments. The Co Tb films exhibited a magnetization compensation point at which the moments of Co and Tb sublattices canceled each other, giving rise to the AFM state. The temperature(T)-dependent Hall measurements showed anomalous Hall effect(AHE) and THE responses at T≠T_(M) but pure THE responses at T=T_(M). Control measurements and analyses suggest that the THE responses are associated with interfacial Dzyaloshinskii-Moriya interaction(DMI) rather than the overlapping of different AHE signals in the structure. This work presents the first-ever observation of interfacial DMI-induced THE in AFM metal trilayered systems and demonstrates a new approach for electrical reading of chiral spin textures in AFM thin film-based heterostructures.

关键词： topological Hall effect antiferromagnetic state chiral spin textures

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Magnetoresistance and exchange bias in high Mn content melt-spun Mn_(46)Ni_(42)Sn_(11)Sb_1 alloy ribbon

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Chinese Physics B 2016年第5期25卷 316-320页

作者：黄庆学陈峰华张敏刚许小红 Heavy Machinery Engineering Research center of Education Ministry College of Mechanical EngineeringTaiyuan University of Science and Technology School of Chemistry and materials Science Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education Shanxi Normal University

Highly textured Heusler alloy Mn_（46）Ni_（42）Sn_（11）Sb_1 ribbons were prepared by melt spinning. The annealed high Mn content Mn46Ni42Sn11Sb1 ribbon cross-section microstructure, crystal structure, martensitic transformation（MT）, and magnetoresistance（MR） properties were investigated. The MR in the annealed ribbon was assessed by the magnetic field direction perpendicular to the ribbon surface with the magnetic field up to 30 k Oe. The large negative value of 25% for MR was obtained at 244 K. The exchange bias（EB） effects of the as-spun and annealed ribbons were investigated. After annealing, the EB effects have been improved by about 25 Oe at the temperature of 50 K. The magnetizations have increased approximately by 10% more than the as-spun ribbon.

关键词： Heusler alloy melt spun magnetoresistance exchange bias

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Quantum Correlations in Werner Derivatives

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Communications in Theoretical Physics 2013年第10期60卷 405-409页

作者：王胜芳刘益民李国锋刘先松张战军 Engineering Technology Research center of magnetic materials Anhui ProvinceSchool of Physics & Materials ScienceAnhui University Department of Physics Shaoguan University

Quantum correlations in Werner derivatives are studied with two different approaches, i.e., measurement- induced disturbance （MID） [Phys. Rev. A 77 （2008） 022301] and ameliorated MID （AMID） [J, Phys. A 44 （2011） 352002]. They are derived via strict deductions with MID while numerically calculated via the measurement optimization with AMID. Interestingly, quantum correlations captured with both approaches are completely coincident. Moreover, some distinct features of the quantum correlations and their underlying physics are exposed via analyses and discussions.

关键词： quantum correlation Werner derivatives measurement-induced disturbance (MID) amelioratedMID (AMID)

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Spontaneous positive exchange bias effect in SrFeO_(3-x)/SrCoO_(3-x) epitaxial bilayer

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Rare Metals 2021年第7期40卷 1858-1864页

作者： Tian-Cong Su Jun Zhang Wei Zhang Ying-Ying Wang Hui-Hui Ji Xiao-Jiao Wang Guo-Wei Zhou Zhi-Yong Quan Xiao-Hong Xu School of Chemistry and materials Science Shanxi Normal UniversityLinfen 041004China Department of Chemistry and Chemical Engineering Lvliang UniversityLvliang 033001China Key Laboratory of magnetic Molecules and magnetic Information materials of Ministry of Education Linfen 041004China Research Institute of materials Science Shanxi Normal UniversityLinfen 041004China Collaborative Innovation center for Shanxi Advanced Permanent magnetic materials and Techonology Linfen 041004China

A novel phenomenon of spontaneous positive exchange bias(PEB)is reported in SrFeO_(3-x)/SrCoO_(3-x) epitaxial bilayer without undergoing any magnetic field *** inserting a thick SrTiO3(STO)nonmagnetic spacer(about 6 nm)into the bilayer interface,this phenomenon still *** on a series of testing means,the spontaneous PEB effect is supposed to be mainly related to short-range ferromagnetic(FM)exchange coupling at the interface when there is no STO *** the STO interlayer reaches up to a certain thickness,shortrange coupling interaction basically *** this time,the long-range dipole field may be responsible for the coupling of the FM and antiferromagnetic(AFM)layer across the nonmagnetic STO and then leads to the same bias *** discoveries provide a new way to realize and manipulate spontaneous exchange bias-based spintronics devices,such as magnetic recording heads and spin valves.

关键词： SrFeO_(3-x)/SrCoO_(3-x)bilayer Spontaneous positive exchange bias Long-range dipole field Exchange coupling

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Controllable Synthesis and magnetic Properties of Monodisperse Fe_3O_4 Nanoparticles

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Chinese Physics Letters 2016年第10期33卷 107-111页

作者：王朱良马慧王芳李敏张利国许小红 Key Laboratory of magnetic Molecules and magnetic Information Material(Ministry of Education) School of Chemistry and Materials ScienceShanxi Normal University

Magnetite （Fe3O4） nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the growth mechanism in detail. It is found that the size and shape of nanoparticles are determined by adjusting the precursor concentration and duration time, which can be well explained by the mechanism based on the LaMer model in our synthetic system. The monodisperse Fe3O4 nanoparticles have a mean diameter from 5nm to 16nm, and shape evolution from spherical to triangular and cubic. The magnetic properties are size-dependent, and Fe3O4 nanoparticles in small size about 5 nm exhibit superparamagnetie properties at room temperature and maximum saturation magnetization approaches to 78 emu/g, whereas Fe3O4 nanoparticles develop ferromagnetic properties when the diameter increases to about 16nm.

关键词： Fe acac in is on of Controllable Synthesis and magnetic Properties of Monodisperse Fe3O4 Nanoparticles

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Effects of Pr-Cu-Ti intergranular addition on microstructure and magnetic properties of heavy-rare-earth-free Nd-Fe-B sintered magnets

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Journal of Rare Earths 2022年第5期40卷 778-783,I0004页

作者： Jinhao Zhu Guangfei Ding Bo Zheng Haichen Wu Lei Jin Zhehuan Jin Shuai Guo Renjie Chen Aru Yan CAS Key Laboratory of magnetic materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Analytical center Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

By intergranular addition of Pr-Cu-Ti alloy powders in the Nd-Fe-B sintered magnets with the normal B component,we propose an approach to the optimization of grain boundary and local Nd-Fe-B composition *** coercivity is enhanced from 1.42 to 1.86 T,while further addition leads to a reduction in remanence and *** analyses of phase composition reveal that Ti mainly exists in the form of metallic Ti alloy,and part of Ti combines with B to form the TiB2 phase after the liquid phase sintering *** process results in a consumption of B in the local Nd-Fe-B composition system and a change of the grain boundary component,which contributes to the formation process of the RE_(6)(Fe,M)_(14) phase after the annealing ***,with the modification of grain boundary and composition system,the intergranular addition of Pr-Cu-Ti induces the generation of continuous thin grain boundary *** promotes the intergrain exchange decoupling,increasing the coercivity in the annealed *** the excess addition results in the segregation of TiB_(2),as well as the precipitation of TiB_(2) into the Nd-Fe-B phase,which leads to structural ***,the further effort for the addition alloy with Ti to reduce the deterioration of the microstructure will lead to further improvement in magnetic properties.

关键词： Nd-Fe-B sintered magnet magnetic properties Grain boundary Microstructures Rare earths

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Phase structure evolution and coercivity mechanism of high-Co containing permanent magnets

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Chinese Physics B 2024年第11期33卷 403-410页

作者： Min Huang Yong Ding Zhihe Zhao Chunguo Wang Bo Zhou Lei Liu Yingli Sun Aru Yan CISRI & NIMTE Joint Innovation center for Rare Earth Permanent Magnets CAS Key Laboratory of Magnetic Materials and DevicesZhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China

The phase structure and magnetic properties of high-Co containing permanent magnets with high thermal stability have been systematically studied in this *** is abnormal that the coercivity of annealed samples was slightly lower than that of sintered samples,while the coercivity was usually enhanced after annealing in conventional Nd–Fe–B *** analysis showed that in addition to RE2(Fe,Co)14B main phase and RE-rich grain boundary phase,there were also new Co-rich magnetic phases located in the grain *** annealing,the phase structures of high-Co containing magnets were readjusted,especially the increasing Co-rich magnetic phase and emerging RE-rich particles precipitated from the main ***,the isolated RE-rich particles would act as the pinning center of the domain wall movement in demagnetization *** was confirmed that the coercivity of annealed high-Co containing magnets was controlled by both nucleation and *** mechanism can partially compensate for the weakening of magnetic isolation due to increased Co-rich magnetic phase,which explained the moderate decrease in coercivity of annealed high-Co containing *** discovery of new coercivity mechanism contributed to in-depth understanding of high-Co containing magnets.

关键词： Co-rich phase pinning coercivity mechanism high-Co containing magnets

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The pulsed high magnetic field facility and scientific research at Wuhan National High magnetic Field center

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Matter and Radiation at Extremes 2017年第6期2卷 278-286页

作者： Xiaotao Han Tao Peng Hongfa Ding Tonghai Ding Zengwei Zhu Zhengcai Xia Junfeng Wang Junbo Han Zhongwen Ouyang Zhenxing Wang Yibo Han Houxiu Xiao Quanliang Cao Yiliang Lv Yuan Pan Liang Li Wuhan National High magnetic Field center Huazhong University of Science and TechnologyWuhan430074China

Wuhan National High magnetic Field center(WHMFC)at Huazhong University of Science and Technology is one of the top-class research centers in the world,which can offer pulsed fields up to 90.6 T with different field waveforms for scientific research and has passed the final evaluation of the Chinese government in *** paper will give a brief introduction of the facility and the development status of pulsed magnetic fields research at *** addition,it will describe the application development of pulsed magnetic fields in both scientific and industrial research.

关键词： Pulsed high magnetic field Pulsed magnet Scientific research Electromagnetic technology

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Crystal structures, phase relationships, and magnetic phase transitions of R_5M_4 compounds (R = rare earths, M = Si, Ge)

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Chinese Physics B 2013年第9期22卷 1-28页

作者：欧阳钟文饶光辉 Wuhan National High magnetic Field center Huazhong University of Science and Technology School of materials Science and Engineering Guilin University of Electronic Technology

Our recent studies of the crystal structures, phase transitions, and magnetic properties of intermetallic compounds RsM4 （R = rare earths; M = Si, Ge） are reviewed briefly. First, crystal structures, phase relationships, and magnetic prop- erties of several 5：4 compounds, including Nd5 Si4-xGex, Pr5 Si4_xGex, Gds-xLaxGe4, La5 Si4, and Gd5 Sn4, are presented. In particular, the canted spin structures as well as the magnetic phase transitions in PrsSi2Ge2 and PrsGe4 investigated by neutron powder diffractions and small-angle neutron scattering are reviewed. Second, the crystal structures and magnetic properties of the most studied compounds Gds（Si,Ge）4 are summarized. The focus is on the parent compound GdsGe4, which is an amazing material exhibiting magnetic anisotropy, angular dependent spin-flop transition, metastable magnetic response, Griffiths-like phase, thermal effect under pulsed fields, antiferromagnetic and ferromagnetic resonances, pro- nounced effects of impurities, and high-field induced magnetic transitions.

关键词： crystal structure phase relationship magnetic phase transition

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Operando NMR methods for studying electrocatalysis

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magnetic Resonance Letters 2024年第2期4卷 54-64页

作者： Zhiyu Zhu Ruipeng Luo Evan Wenbo Zhao magnetic Resonance Research center Institute for Molecules and MaterialsRadboud University6525 AJ Nijmegenthe Netherlands

The combination of electrochemical measurements with spectroscopic characterizations provides valuable insights into reaction *** magnetic resonance(NMR)spectroscopy,as a powerful technique due to its atomic specificity and versatility in studying gas,liquid,and solid,allows the study of electrolyte solution,catalyst and catalyst-adsorbate *** applied in operando,NMR can offer molecular-level insights into various electrochemical *** NMR has been applied extensively in battery research,but relatively underexplored for electrocatalysis in the past two *** this mini review,we first introduce the operando electrochemical NMR setups,categorized by different probe *** we review the applications of operando NMR for monitoring the electrolyte solution and the catalyst-adsorbate *** the high environmental impact of electrochemical conversion of CO_(2)into value-added products,we zoom in to the use of operando NMR in studying electrochemical CO_(2)***,we provide our perspective on further developing and applying operando NMR methods for understanding the complex reaction network of Cu-catalyzed electrochemical CO_(2)reduction.

关键词： Operando NMR In situ NMR EC-NMR Electrocatalysis Electrochemical CO_(2)reduction

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