Thickness dependence of the magnetic properties of MnAs films on GaAs(001) and GaAs(113)A:: Role of a natural array of ferromagnetic stripes

被引：41

作者：

Däweritz, L ^{[1
]}

Wan, L ^{[1
]}

Jenichen, B ^{[1
]}

Herrmann, C ^{[1
]}

Mohanty, J ^{[1
]}

Trampert, A ^{[1
]}

Ploog, KH ^{[1
]}

机构：

[1] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2004年 / 96卷 / 09期

关键词：

D O I：

10.1063/1.1790576

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Systematic studies of as-grown MnAs films deposited by molecular-beam epitaxy on GaAs(001) and GaAs(113)A reveal that their magnetic properties and, in particular, their saturation magnetization are determined by the phase separation into stripes of ferromagnetic alpha-MnAs and paramagnetic beta-MnAs. Using a specific saturation magnetization M-S*, which refers to the actual volume of alpha-MnAs, the thickness dependence of M-S(*) can be described in a universal way. It is due to the variation of the stripe structure and the changing of the intra- and interstripe magnetic interaction. Values well above similar to1100 emu/cm(3), obtained for the optimum film thickness at room temperature, are considered as an intrinsic property of a nearly defect-free MnAs in the fully magnetized state. (C) 2004 American Institute of Physics.

引用

页码：5056 / 5062

页数：7

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