2016年
Effective Damping Constant and Current Induced Magnetization Switching of GdFeCo/TbFe Exchange-Coupled Bilayers
IEEE MAGNETICS LETTERS
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- 巻
- 7
- 号
- 開始ページ
- 3505605-1-5
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1109/LMAG.2016.2595502
- 出版者・発行元
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
The Gilbert damping constants alpha and effective perpendicular magnetic anisotropies K-eff of amorphous GdFeCo (10 - x nm)/TbFe (x nm) exchange-coupled bilayers with various TbFe layer thicknesses x were measured. The products alpha x K-eff of the bilayers were compared with the critical current densities J(c) for current-induced magnetization switching (CIMS) in giant magnetoresistance nanopillars with a GdFeCo/TbFe memory layer. The damping constant alpha 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 K-eff and the product of saturation magnetization times anisotropy field M-s H-k also increased with increasing TbFe thickness x. The CIMS of the GdFeCo (9 nm)/TbFe (1 nm) bilayer exhibited 1.6 times larger J(c) than that of GdFeCo (10 nm), while the product alpha x K-eff increased by a factor of 10.
- リンク情報
- ID情報
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- DOI : 10.1109/LMAG.2016.2595502
- ISSN : 1949-307X
- Web of Science ID : WOS:000384310800001