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Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO_(3) heterostructure

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Chinese Physics B 2021年第11期30卷 565-569页

作者： Na Li Jin Tang Lei Su Ya-Jiao Ke Wei Zhang Zong-Kai Xie Rui Sun Xiang-Qun Zhang Wei He Zhao-Hua Cheng State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO_(3) via an all-optical *** laser irradiation,the terahertz spin precession is hard to be excited in a bare GdFeO_(3) without spin reorientation phase but efficiently in Fe/GdFeO_(3).Both quasi-ferromagnetic and impurity modes,as well as a phonon mode,are *** attribute it to the optical modification of interfacial exchange coupling between Fe and ***,the excitation efficiency of dynamics can be modified significantly via the pump laser *** results elucidate that the interfacial exchange coupling is a feasible stimulation to efficiently excite terahertz spin dynamics in *** will expand the exploration of terahertz spin dynamics for antiferromagnet-based opto-spintronic devices.

关键词： ultrafast magnetization dynamics antiferromagnetics magnetic oxides magnetization dynamics

Magnetic properties of the double perovskite compound Sr2YRuO6

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Chinese Physics B 2019年第9期28卷 338-342页

作者： N. EL Mekkaoui S. Idrissi S. Mtougui I. EL Housni R. Khalladi S. Ziti H. Labrim L. Bahmad Laboratoire de la Matiere Condensee et des Sciences Interdisciplinaires(LaMCScI) Mohammed V UniversityFaculty of SciencesB.P. 1014 RabatMorocco Intelligent Processing and Security of Systems Mohammed V University in RabatFaculty of SciencesB.P. 1014 RabatMorocco USM/DERS/ Centre National de l’Energie des Sciences et des Techniques Nucleaires(CNESTEN)RabatMorocco

We study the magnetic properties of the double perovskite ruthenate compound Sr2YRuO6 using Monte Carlo simulations(MCS).We elaborate the ground state phase diagrams for all possible and stable *** magnetizations and the susceptibilities as a function of temperature for the studied system are also *** effects of the exchange coupling interactions and the crystal field are examined and *** the other hand, since the compound Sr2YRuO6 exhibits an antiferromagnetic behavior, we find its Néel temperature, TN≈ 31 K, which is in good agreement with the experimental results in the *** complete this study, the hysteresis loops and the coercive field as a function of the external magnetic field are also obtained for fixed values of the physical parameters.

关键词： Monte Carlo Ising model antiferromagnetics magnetic properties of nanostructures

Spin transport in antiferromagnetic insulators

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Chinese Physics B 2019年第8期28卷 10-15页

作者： Zhiyong Qiu Dazhi Hou Key Laboratory of Materials Modification by Laser Ionand Electron Beams (Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116023China WPI Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

Electrical spin,which is the key element of spintronics,has been regarded as a powerful substitute for the electrical charge in the next generation of information technology,in which spin plays the role of the carrier of information and/or energy in a similar way to the electrical charge in ***-transport phenomena in different materials are central topics of *** electrical charge,spin transport does not depend on electron motion,particularly spin can be transported in insulators without accompanying Joule ***,insulators are considered to be ideal materials for spin conductors,in which magnetic insulators are the most compelling ***,we experimentally studied and theoretically discussed spin transport in various antiferromagnetic systems and identified spin susceptibility and the Néel vector as the most important factors for spin transport in antiferromagnetic ***,we summarize our experimental results,physical nature,and puzzles *** challenges and potential applications are also discussed.

关键词： spintronics spin wave antiferromagnetics spin transport

Phase transition of the frustrated antiferromagntic J1-J2-J3 spin-1/2 Heisenberg model on a simple cubic lattice

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Frontiers of physics 2019年第1期14卷 137-146页

作者： Ai-Yuan Hu Huai-Yu Wang College of Physics and Electronic Engineering Chongqing Normal University Chongqing 401331 China Department of Physics Tsinghua University Beijing 100084 China

We have comprehensively investigated the frustrated J1-J2-J3 Heisenberg model on a simple cubic lattice. This model allows three regimes of magnetic order, viz., (π;π;π), (0;π;π) and (0;0;π), denoted as AF1, AF2, and AF3, respectively. The effects of the interplay of neighboring couplings on the model are studied in the entire temperature range. The zero temperature magnetic properties of this model are discussed utilizing the linear spin wave (LSW) theory, nonlinear spin wave (NLSW) theory, and Green’s function (GF) method. The zero temperature phase diagrams evaluated by the LSW and NLSW methods are illustrated, and are observed to exhibit different parameter boundaries. In certain regions and along the parameter boundaries, the possible phase transformations driven by the parameters are discussed. The results obtained using the LSW, NLSW, and GF methods are compared with those obtained using the series expansion (SE) method, and are observed to be in good agreement when the value of J2 is not close to the parameter boundaries. The ground state energies obtained using the LSW and NLSW methods are close to that obtained using the SE method. At finite temperatures, only the GF method is employed to evaluate the magnetic properties, and the calculated phase diagram is observed to be identical to the classical phase diagram. The results indicate that at the parameter boundaries, a temperature-driven first-order phase transition between AF1 and AF2 may occur along the boundary line. Along the AF1-AF3 and AF2-AF3 boundary lines, AF3 is less stable than AF1 and AF2. Our calculated critical temperature agrees with that obtained using Monte Carlo simulations and pseudofermion functional renormalization group scheme.

关键词： quantized spin models quantum phase transitions antiferromagnetics

Al-doping-induced magnetocapacitance in the multiferroic CuCrS_2

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Chinese Physics B 2013年第2期22卷 477-480页

作者：刘荣灯刘蕴韬陈东风何伦华闫丽琴王志翠孙阳王芳卫 China Institute of Atomic Energy State Key Laboratory of Magnetism Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics Chinese Academy of Sciences

In this paper,magnetic and dielectric properties of the quasi-two-dimensional triangular-lattice system CuCrS2 and its B-site-diluted analogs CuAl1-xCrxS2（x = 0.01 and x = 0.02） are *** phase transition is observed at about 38.5 K by magnetization measurement without shift induced by a small amount of doping *** effect is found near TN in each of the three *** dielectric constant decreases and the magnetocapacitance increases with the increase of substitution of nonmagnetic Al3＋ ions for the magnetic Cr^3＋ *** negative magnetocapacitive effect reaches ～ 13% for CuAl0.02Cr0.98S2.

关键词： magnetocapacitance dielectric property magnetoelectric coupling antiferromagnetics

Quantum Nucleation of Antiferromagnetic Bubbles with Tetragonal and Hexagonal Symmetries

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Communications in Theoretical Physics 2004年第2期41卷 311-320页

作者： PANHui ZHUJia-Lin LüRong DepartmentofPhysics TsinghuaUniversityBeijing100084China CenterforAdvancedStudy TsinghuaUniversityBeijing100084.China

We study the quantum nucleation in a nanometer-scale antiferromagnet placed in a magnetic field at an arbitrary angle. We consider the magnetocrystalline anisotropy with tetragonal symmetry and that with hexagonal symmetry, respectively. Different structures of the tunneling barriers can be generated by the magnitude and the orientation of the magnetic field. We use the instanton method in the spin-coherent-state path-integral representation to calculate the dependence of the rate of quantum nucleation and the crossover temperature on the orientation and strength of the field for bulk solids and two-dimensional films of antiferromagnets, respectively. We find that the rate of quantum nucleation and the crossover temperature from thermal-to-quantum transitions depend on the orientation and strength of the external magnetic field distinctly, which can be tested by use of existing experimental techniques.

关键词： macroscopic quantum phenomena tunneling magnetic anisotropy antiferromagnetics