Calorimetric studies of the A1 to L10 transformation in FePt and CoPt thin films

被引：80
|
作者：
Barmak, K [1 ]
Kim, J
Shell, S
Svedberg, EB
Howard, JK
机构：
[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
[2] Carnegie Mellon Univ, Ctr Data Storage Syst, Pittsburgh, PA 15213 USA
[3] Seagate Res, Pittsburgh, PA 15203 USA
来源：
APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 22期
关键词：
D O I：
10.1063/1.1483924
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Using differential scanning calorimetry, the enthalpy (activation energy) for the A1 to L1(0) transformation in FePt and CoPt thin films have been measured as -10.2+/-2.1 kJ/g -atom (1.7+/-0.1 eV) and -3.1+/-0.2 kJ/g-atom (2.8+/-0.2 eV), respectively. FePt is further seen to transform at temperatures that are approximately 120 degreesC lower than those for CoPt. The enthalpy of grain growth that accompanies the transformation is shown to be negligibly small by comparison to the transformation enthalpy in both films. The impact of our findings on alloy development for ultrahigh density magnetic storage media is discussed. (C) 2002 American Institute of Physics.
引用
收藏
页码：4268 / 4270
页数：3
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