期刊
NANOTECHNOLOGY
卷 29, 期 17, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aaaf35
关键词
domain-wall motion; ultrahigh speed; spin-orbital torque; synthetic antiferromagnets; RKKY-style coupling
资金
- National Natural Science Foundation of China [11 574 096, 11 744 002, 11 474 225, 61 674 062]
- Huazhong University of Science and Technology [2017KFYXJJ037]
In this article, we present our numerical investigation about the spin-orbit-torque induced domain-wall (DW) motion in a synthetic antiferromagnetic multilayer nanotrack. This nanotrack was composed by two ferromagnetic (FM) layers with a RKKY inter-layer antiferromagnetic (AFM) exchange coupling. The velocity of DW was well manipulated by varying parameters including inter-layer exchange constant, the Dzyaloshinskii-Moriya interaction (DMI) strength, the current density and the magnetic anisotropy. The DW velocity was found to be strictly related to the orientation of the moments in the two FM layers. When the inter-layer exchange constant or the DMI constant were larger than a critical value, there was a large angle between the moments in one FM layer and that in the other one under the current, and the DW was driven to move at an ultrahigh speed (around 10 000 m s(-1)). However, when the DMI or the AFM exchange coupling was weaker than the critical value, the moments in one FM layer were parallel to that in the other one under the current, and the velocity was significantly reduced.
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