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Evaluation of distribution of exchange coupling in CoFe/Ru/CoFe synthetic antiferromagnetic structure after annealing

Authors :
Hiroshi Takada
Kiichi Yoshiara
Shingo Tomohisa
Taisuke Furukawa
Takeharu Kuroiwa
Takashi Takenaga
Source :
Journal of Applied Physics. 105:07C310
Publication Year :
2009
Publisher :
AIP Publishing, 2009.

Abstract

We investigated the exchange-coupling fields of CoFe/Ru (tRu)/CoFe synthetic antiferromagnetic (SyAF) structures with a Ru underlayer and capping layer before and after annealing at 300 and 350 °C. Exchange-coupling field Hex decreased after annealing and distribution increases in Hex were observed in the structure of smaller tRu, especially at tRu≤0.7 nm. Remanence magnetizations increased at smaller tRu. These results indicate that distribution is caused by the existence of the antiferromagnetic coupling of locally various coupling fields due to annealing. A larger exchange-coupling field after high temperature annealing can be obtained by suppressing the distribution of the exchange coupling in the SyAF structure.

Details

ISSN :
10897550 and 00218979
Volume :
105
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........5f66bbdf135506e2258b306e848e5339
Full Text :
https://doi.org/10.1063/1.3077221