Surface effects in Mn L3,2 x-ray absorption spectra from (Ga,Mn)As

被引：82

作者：

Edmonds, KW ^{[1
]}

Farley, NRS

Campion, RP

Foxon, CT

Gallagher, BL

Johal, TK

van der Laan, G

MacKenzie, M

Chapman, JN

Arenholz, E

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England

[3] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.1751619

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have identified a Mn-rich layer on the surface on (Ga,Mn)As thin films which significantly influences soft x-ray absorption measurements. The Mn L-3,L-2 x-ray absorption spectra of the untreated films show a strong multiplet structure, consistent with earlier observations and characteristic of MnO. After removal of the surface layer, the multiplet structure is less pronounced and the spectrum is shifted to similar to0.5 eV lower photon energy. Comparison with calculated spectra imply a localized Mn ground state for the untreated sample and a hybridized ground state after etching. In addition, a large x-ray magnetic circular dichroism is observed at the Mn L-3,L-2 edge in the etched film. These results may explain several peculiarities of previously reported x-ray absorption studies from (Ga,Mn)As. (C) 2004 American Institute of Physics.

引用

页码：4065 / 4067

页数：3

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