Magnetoelastic coupling of MnAs/GaAs(001) close to the phase transition -: art. no. 092406

被引：15
作者：
Koch, R
Pampuch, C
Yamaguchi, H
Das, AK
Ney, A
Däweritz, L
Ploog, KH
机构：
[1] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany
[2] NTT Basic Res Labs, Atsugi, Kanagawa 2430198, Japan
[3] Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.70.092406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetoelastic coupling of epitaxial MnAs films on GaAs(001) has been investigated with a sensitive cantilever beam magnetometer. We find that even at 10 degreesC, i.e., very close to the combined structural and magnetic phase transition from alpha- to beta-MnAs (10-40 degreesC), the magnetoelastic coupling constants are comparable in magnitude with the small values of the 3d ferromagnets. The coupling is largest within the hexagonal plane of MnAs, described by constant B-1, rather than along the c-axis, where the Mn atoms are nearest neighbors. Our experimental results, therefore, support an indirect exchange mechanism via the Mn-As-Mn bonds in accordance with pair model calculations.
引用
收藏
页码：092406 / 1
页数：4
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