Effect of initial stress/strain state on order-disorder transformation of FePt thin films

被引：80

作者：

Hsiao, S. N. ^{[1
]}

Yuan, F. T. ^{[2
]}

Chang, H. W. ^{[3
]}

Huang, H. W. ^{[1
]}

Chen, S. K. ^{[1
]}

Lee, H. Y. ^{[4
]}

机构：

[1] Feng Chia Univ, Dept Mat Sci & Engn, Taichung 40724, Taiwan

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[3] Tunghai Univ, Inst Phys, Taichung 40704, Taiwan

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30077, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 23期

关键词：

compressive strength; internal stresses; iron alloys; metallic thin films; nucleation; order-disorder transformations; platinum alloys; tensile strength; GROWTH;

D O I：

10.1063/1.3153513

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Initial stress (sigma(i)) of a room-temperature deposited FePt films was manipulated to study the order-disorder transformation. We observed that, while sigma(i) was increased from -1.01 (compressive) to 0.18 GPa (tensile), the phase transformation activation energy decreased from 0.387 to 0.23 eV/atom. This causes a reduction in ordering temperature of about 100 degrees C. We also found that densification induces an increase in tensile stress of about 1 GPa before ordering. In the films with small sigma(i), strong tension facilitates the nucleation of L1(0) FePt; however, if highly compressive sigma(i) cancels the densification tension, ordering is retarded causing higher ordering temperature.

引用

页数：3

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