期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 48, 期 16, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/48/16/164010
关键词
Heusler alloy; spin torque; magnetization dynamics; GMR
资金
- Japan Science and Technology (JST) Agency
We studied the spin torque-induced magnetization dynamics of full-Heusler Co-2(Fe, Mn) Si (CFMS) layers in current-perpendicular-to-plane (CPP) giant magnetoresistance (GMR) devices, and obtained the phase diagrams of spin torque-induced phenomena such as magnetization switching and spin torque oscillation. For a device with a 3 nm-thick CFMS free layer and a 20 nm-thick CFMS fixed layer, spin torque oscillation was induced in the free layer magnetization. As the free layer thickness was increased from 3 to 7 nm, on the other hand, the magnetization dynamics were remarkably changed. A 7 nm-thick CFMS free layer showed no clear spin torque oscillation even though it showed the reversible magnetization switching. On the contrary, the magnetization in the 20 nm-thick CFMS fixed layer oscillated at a certain condition. This spin torque-induced instability in the fixed layer magnetization is attributable to the increase in the free layer thickness, the structure of the fixed layer having the extended film, and the stray field coupling between the free and the fixed layers.
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