Soft magnetic characteristics of an ultrathin CoFeNi free layer in spin-valve films

Hideaki Fukuzawa, Hitoshi Iwasaki, Katsuhiko Koi, Masashi Sahashi

研究成果: Article査読

6 被引用数 (Scopus)

抄録

We have investigated the soft magnetic characteristics of an ultrathin Co-rich CoFeNi free layer in spin-valve films. By addition of Ni to a Co-rich CoFe free layer, magnetostriction (λ) of the films increased positively with Ni concentration, in contrast to which a Co90Fe10 free layer showed a negatively large λ. However, Ni addition also caused an increase in coercivity of the easy axis direction (Hc e.a.). To avoid this problem, a slight decrease in the Co contents of a CoFeNi free layer was found to be effective for decreasing Hc e.a.. In order to satisfy both the small λ and H ce.a., a free layer of (Co86Fe 14)88-94Ni12-6 proved to be an optimum composition in spin-valve films. Moreover, the zero λ composition of the CoFeNi free layer was changed by a high-conductance Cu layer deposited on the free layer, which was considered to come from the lattice strain of a free layer.

本文言語English
ページ(範囲)65-71
ページ数7
ジャーナルJournal of Magnetism and Magnetic Materials
298
1
DOI
出版ステータスPublished - 2006 3 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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