Spin-transfer-torque induced spatially nonuniform switching in ferrimagnets

doi:10.1063/5.0179040

	Spin-transfer-torque induced spatially nonuniform switching in ferrimagnets
	Zhang, Xue1,2,3 ; Xu, Zhengde1,2,3 ; Ren, Jie1 ; Qiao, Yixiao1 ; Fan, Weijia 4; Zhu, Zhifeng1,5
	2024
发表期刊	APPLIED PHYSICS LETTERS
ISSN	0003-6951
卷号	124 期号:1
DOI	10.1063/5.0179040
摘要	Ferrimagnet (FiM), (FeCo)1−xGdx, attracts research attention due to its ultrafast magnetic dynamics and finite net magnetization. Incorporating FiM into the magnetic tunnel junction will be beneficial to further improve the writing speed of magnetic random access memory. It is commonly assumed that the FeCo and Gd atoms are switched together due to the strong exchange coupling, which remains valid even if one performs the two-sublattice macrospin simulation. Interestingly, using the atomistic model developed by our group, it is clearly seen that different atoms are not switched together. In addition, our study reveals that the nature of switching is spatially nonuniform even in the small sample with the dimension of 20 × 20 nm2. Furthermore, the characteristics of nonuniformity are completely different for samples with different Gd compositions (x). When x is close to the magnetization compensation point, successful switching cannot be obtained, but is accompanied by the stable oscillation. The atom type that dominates the oscillation is different from that predicted by the two-sublattice macrospin model. In addition, the size of a singular region is a non-monotonic function of current density. All these results can only be understood by considering the spatial nonuniform magnetization dynamics. © 2024 Author(s).
关键词	Binary alloys Cobalt alloys Ferrimagnetism Iron alloys Magnetic storage Magnetization Random access storage Tunnel junctions Atomistic modelling Ferrimagnets Magnetic dynamics Magnetic random access memory Magnetic tunnel junction Small samples Spin transfer torque Sub-lattices Ultra-fast Writing speed
URL	查看原文
收录类别	EI
语种	英语
出版者	American Institute of Physics Inc.
EI入藏号	20240215344720
EI主题词	Atoms
EI分类号	545.2 Iron Alloys ; 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals ; 701.2 Magnetism: Basic Concepts and Phenomena ; 708.4 Magnetic Materials ; 722.1 Data Storage, Equipment and Techniques ; 931.3 Atomic and Molecular Physics
原始文献类型	Journal article (JA)
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/364682
专题	信息科学与技术学院信息科学与技术学院_硕士生信息科学与技术学院_博士生信息科学与技术学院_PI研究组_祝智峰组
通讯作者	Fan, Weijia; Zhu, Zhifeng
作者单位	1.School of Information Science and Technology, ShanghaiTech University, Shanghai; 201210, China 2.Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai; 200050, China 3.University of Chinese Academy of Sciences, Beijing; 100049, China 4.Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai; 200092, China 5.Shanghai Engineering Research Center of Energy Efficient and Custom AI IC, Shanghai; 201210, China
第一作者单位	信息科学与技术学院
通讯作者单位	信息科学与技术学院
第一作者的第一单位	信息科学与技术学院
推荐引用方式 GB/T 7714	Zhang, Xue,Xu, Zhengde,Ren, Jie,et al. Spin-transfer-torque induced spatially nonuniform switching in ferrimagnets[J]. APPLIED PHYSICS LETTERS,2024,124(1).
APA	Zhang, Xue,Xu, Zhengde,Ren, Jie,Qiao, Yixiao,Fan, Weijia,&Zhu, Zhifeng.(2024).Spin-transfer-torque induced spatially nonuniform switching in ferrimagnets.APPLIED PHYSICS LETTERS,124(1).
MLA	Zhang, Xue,et al."Spin-transfer-torque induced spatially nonuniform switching in ferrimagnets".APPLIED PHYSICS LETTERS 124.1(2024).