Large Uniaxial Magnetic Anisotropy of Co–Pt Perpendicular Films Induced by Lattice Deformation
Large Uniaxial Magnetic Anisotropy of Co–Pt Perpendicular Films Induced by Lattice Deformation
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DOI：
10.1109/tmag.2007.893126
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发表时间：
2007-05
影响因子：
2.1
通讯作者：
T. Shimatsu;Y. Okazaki;H. Sato;O. Kitakami;S. Okamoto;H. Aoi;H. Muraoka;Y. Nakamura
中科院分区：
文献类型：
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作者：
T. Shimatsu;Y. Okazaki;H. Sato;O. Kitakami;S. Okamoto;H. Aoi;H. Muraoka;Y. Nakamura
在Pt含量为10 ~ 30 at%的宽范围内，对沉积在Ru种子层上的Co-Pt垂直薄膜的单轴磁各向异性Ku随厚度的变化关系进行了研究，以进一步研究薄膜厚度减小时Ku显著增加的原因，这是以前报道的Co 80 Pt 20/Ru薄膜。Ku显着增加，在所有系列的薄膜与不同的Pt含量的厚度减小。随着Pt含量的减少，Ku随厚度减小的增加率变得越来越大。在所研究的Pt含量范围内，2 nm厚的膜的Ku几乎为常数2 × 107 erg/cm ~ 3，而对于厚度大于5 nm的膜，Ku在25-30at%Pt含量时最大。实验结果表明，降低厚度时Ku的增加主要与hcp Co-Pt晶格c/a比的降低有关
A study of the thickness dependence of the uniaxial magnetic anisotropy Ku 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 Co80Pt20/Ru films. Ku increased significantly as the thickness decreased in all series of films with various Pt content. The rate of increase of Ku with reducing thickness became increasingly large as the Pt content decreased. It should be noted that the Ku of 2-nm-thick films was an almost constant 2times107 erg/cm3 over the range of Pt contents studied, although Ku was maximized at 25-30at%Pt content for films thicker than 5 nm. Experimental results suggest that the increase in Ku on reducing the thickness was mostly related to a reduction of the hcp Co-Pt lattice c/a ratio