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2 results on '"Wang, Kang"'

1. Magnetization switching of a nearly compensated ferrimagnet by enhanced spin-orbit torque.

Author

Zhang, Xu, Wang, Xiaolu, Jiang, Qisheng, He, Wenqing, Yang, Yongqiang, Gong, Qianxun, Guo, Tengyu, Chen, Peng, Zhang, Jing, Yu, Guoqiang, Han, Xiufeng, Wang, Kang L., Wang, Yue, Cui, Baoshan, and Wu, Hao

Subjects
MAGNETIZATION, FERROMAGNETIC materials, FERRIMAGNETIC materials, TORQUE, SPIN-orbit interactions, COERCIVE fields (Electronics)
Abstract

Spin–orbit torques (SOTs) provide an efficient way to electrically manipulate the magnetic order in spintronic devices. Compared with conventional ferromagnetic materials, ferrimagnetic materials have the advantages of antiferromagnetically coupled sublattices and induced ultrafast spin dynamics. In this paper, we study the current-induced magnetization switching in the ferrimagnetic Ta/GdFeCo/MgO system. Robust SOT-induced magnetization switching can be achieved at the magnetic compensation temperature point of around 70 K, where the magnetization is nearly zero and the coercivity can reach almost 3 T. The temperature dependence of the SOT efficiency is quantified by the second harmonic method, and the enhanced SOT efficiency near the magnetic compensation temperature is attributed to the negative exchange coupling between the two sublattices of CoFe and Gd. This work demonstrates the SOT switching of the nearly compensated ferrimagnet, with great potential for future magnetic interaction-free and ultrafast ferrimagnetic applications. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Evidence for ferromagnetic coupling at the doped topological insulator/ferrimagnetic insulator interface

Author

Mehmet C. Onbasli, Liang He, Wenqing Liu, Koichi Murata, Caroline A. Ross, Rong Zhang, Yongbing Xu, Yan Zhou, Kang L. Wang, Ying Jiang, Yong Wang, Onbaşlı, Mehmet Cengiz (ORCID 0000-0002-3554-7810 & YÖK ID 258783), Liu, Wenqing, He, Liang, Zhou, Yan, Murata, Koichi, Ross, Caroline A., Jiang, Ying, Wang, Yong, Xu, Yongbing, Zhang, Rong, Wang, Kang. L., College of Engineering, Department of Electrical and Electronics Engineering, Massachusetts Institute of Technology. Department of Materials Science and Engineering, Onbasli, Mehmet C., and Ross, Caroline A

Subjects
Materials science, Magnetic domain, Condensed matter physics, Magnetic circular dichroism, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, lcsh:QC1-999, Magnetization, Ferromagnetism, Ferrimagnetism, Nanoscience and nanotechnology, Topological insulator, 0103 physical sciences, Ferrimagnetic insulator, Magnetism, Curie temperature, 010306 general physics, 0210 nano-technology, Penetration depth, lcsh:Physics
Abstract

One of the major obstacles of the magnetic topological insulators (TIs) impeding their practical use is the low Curie temperature (T[subscript c] ). Very recently, we have demonstrated the enhancement of the magnetic ordering in Cr-doped Bi₂Se₃ by means of proximity to the high-T[subscript c] ferrimagnetic insulator (FMI) Y₃Fe₅O₁₂ and found a large and rapidly decreasing penetration depth of the proximity effect, suggestive of a different carrier propagation process near the TI surface. Here we further present a study of the interfacial magnetic interaction of this TI/FMI heterostrucutre. The synchrotron-based X-ray magnetic circular dichroism (XMCD) technique was used to probe the nature of the exchange coupling of the Bi[subscript 2-x] Cr [subscript x] Se₃/Y₃Fe₅O₁₂ interface. We found that the Bi[subscript 2-x] Cr [subscript x] Se₃ grown on Y₃Fe₅O₁₂ (111) predominately contains Cr ³⁺ cations, and the spin direction of the Cr³⁺ is aligned parallel to that of tetrahedral Fe³⁺ of the YIG, revealing a ferromagnetic exchange coupling between the Bi [subscript 2-x] Cr [subscript x] Se₃ and the Y₃Fe₅O₁₂., United States. Defense Advanced Research Projects Agency (N66001-12-1-4034), United States. Defense Advanced Research Projects Agency (N66001-11-1-4105)

Published
2016

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