Thickness dependence of longitudinal coercivity in Fe-Pt-Al thin films

被引:6
作者
Chen, SK [1 ]
Yuan, FT
Hsiao, SN
Chang, HC
Liou, CY
Chang, WC
机构
[1] Feng Chia Univ, Dept Mat Sci & Engn, Taichung 40724, Taiwan
[2] Natl Chung Cheng Univ, Dept Phys, Chiayi 62117, Taiwan
关键词
ordering transformation; FePt; L1(0) structure; thin films; coercivity enhancement;
D O I
10.1016/j.jmmm.2004.04.045
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The thin films (FePt)(100-x)Al-x (x = 0-8.5) with a thickness ranging from 10 to 100 nm were deposited on quartz substrates by RF sputtering. The ternary samples were annealed at a high temperature of 800degrees C. For the sample thicker than 40 nm, the coercivities H-c, and magnetization values M-s of the samples were slightly decreased with increasing Al concentrations. A suppression of FCT phase transformation was observed as Al atoms dissolved into the FePt lattice. This can partially explain the decrease in H-c However, as the film thickness was reduced to 10-20 nm, the H-c values of the Al alloyed films were significantly enhanced. A maximum coercivity of 5.0 kOe was observed in the high-aluminum sample (x = 6.2) with a thickness of only 10 nm, compared with the Hc value of 0.6 kOe for the binary FePt film. The alloy addition of Al might offer heterogeneous nucleation sites for the L1(0) phase and enhanced the ordering transformation in the very thin films. (C) 2004 Published by Elsevier B.V.
引用
收藏
页码:198 / 201
页数:4
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