Correlation of structure and magnetism in GaAs with embedded Mn(Ga)As magnetic nanoclusters

被引：128

作者：

Moreno, M ^{[1
]}

Trampert, A ^{[1
]}

Jenichen, B ^{[1
]}

Däweritz, L ^{[1
]}

Ploog, KH ^{[1
]}

机构：

[1] Paul Drude Inst Solid State Elect, D-10117 Berlin, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2002年 / 92卷 / 08期

关键词：

D O I：

10.1063/1.1506402

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

GaAs thin films with embedded Mn(Ga)As magnetic nanoclusters have been synthesized by annealing (Ga, Mn)As diluted material grown by low-temperature molecular-beam epitaxy (MBE). The structural and magnetic properties of granular films prepared by using different annealing recipes have been investigated by x-ray diffraction, superconducting quantum interference device magnetometry, and transmission electron microscopy. Large spherical hexagonal MnAs nanocrystals are obtained when using rapid thermal annealing. Small tetrahedral zincblende Mn(Ga)As clusters result when annealing under MBE conditions. In both cases, the matrix develops a small tensile strain of similar value. The contribution from diffuse scattering to the diffraction from the granular layers is pronounced only for films with hexagonal clusters. Strong ferromagnetic behavior is observed only in films with hexagonal clusters. (C) 2002 American Institute of Physics.

引用

页码：4672 / 4677

页数：6

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