2024-03-29T06:33:41Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00023014
2023-01-16T04:12:18Z
320:321:322
Effective Damping Constant and Current Induced Magnetization Switching of GdFeCo/TbFe Exchange-Coupled Bilayers
Higashide, Tomohiro
Dai, Bing
Kato, Takeshi
Oshima, Daiki
Iwata, Satoshi
open access
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The Gilbert damping constants α and effective perpendicular magnetic anisotropies Keff of amorphous GdFeCo (10 - x nm)/TbFe (x nm) exchange-coupled bilayers with various TbFe layer thicknesses x were measured. The products α × Keff of the bilayers were compared with the critical current densities Jc for current-induced magnetization switching (CIMS) in giant magnetoresistance nanopillars with a GdFeCo/TbFe memory layer. The damping constant α of the bilayers, estimated from time-resolved magneto-optical Kerr effect measurements, was 0.051 for x = 0, and was significantly enhanced to 0.23 for x = 1. The anisotropy constant Keff and the product of saturation magnetization times anisotropy field Ms Hk also increased with increasing TbFe thickness x. The CIMS of the GdFeCo (9 nm)/TbFe (1 nm) bilayer exhibited 1.6 times larger Jc than that of GdFeCo (10 nm), while the product α × Keff increased by a factor of 10.
Article Sequence Number: 3505605
IEEE
2016-07-28
eng
journal article
AM
http://hdl.handle.net/2237/25201
https://nagoya.repo.nii.ac.jp/records/23014
https://doi.org/10.1109/LMAG.2016.2595502
1949-307X
IEEE Magnetics Letters
7
1
5
https://nagoya.repo.nii.ac.jp/record/23014/files/Higashide_GdFeCo_TbFe_r7_final.pdf
application/pdf
1.8 MB
2018-02-22