Large uniaxial magnetic anisotropy of Co-Pt perpendicular films induced by lattice deformation

被引:24
作者
Shimatsu, T. [1 ]
Okazaki, Y.
Sato, H.
Kitakami, O.
Okamoto, S.
Aoi, H.
Muraoka, H.
Nakamura, Y.
机构
[1] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
关键词
Co-Pt films; fcc volume fraction; hcp lattice; lattice deformation; Ru underlayer; surface anisotropy; uniaxial magnetic anisotropy;
D O I
10.1109/TMAG.2007.893126
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A study of the thickness dependence of the uniaxial magnetic anisotropy K-u of Co-Pt perpendicular films deposited on Ru seed layers was extended over a wide range of Pt content from 10 to 30 at%, to further investigate the origin of the significant increase in K-u on reducing the film thickness, which was previously reported for Co-80 Pt-20 /Ru films. K-u increased significantly as the thickness decreased in all series (if films with various Pt content. The rate of increase of K-u with reducing thickness became increasingly large as the Pt content decreased. It should be noted that the K-u of 2-nm-thick films was an almost constant 2 x 10(7) erg/cm(3) over the range of Pt contents studied, although K-u was maximized at 25-30at%Pt content for films thicker than 5 nm. Experimental results suggest that the increase in K-u on reducing the thickness was mostly related to a reduction of the hcp Co-Pt lattice c/a ratio.
引用
收藏
页码:2995 / 2997
页数:3
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