Mechanism of enhanced ferromagnetism in delta-doped (Ga,Mn)As studied by ab initio electronic structure calculation

被引：5

作者：

Ohishi, Y

Sato, K

Katayama-Yoshida, H

机构：

[1] ISIR, Dept Condensed Matter Phys, Ibaraki, Osaka 5670047, Japan

[2] ISIR, Dept Computat Nanomat Design, Nanosci & Nanotechnol Ctr, Ibaraki, Osaka 5670047, Japan

[3] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 272卷

关键词：

DMS; delta-doping; first-principles calculation; material design; heterostructure; (Ga; Mn)As;

D O I：

10.1016/j.jmmm.2003.12.786

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A mechanism of the enhanced ferromagnetic Curie temperature (T-C) is proposed for (Ga,Mn)As digital ferromagnetic heterostructures (DFH) obtained by incorporating Mn delta-doping layer into GaAs based on the first-principles calculations. Our calculation shows a strong enhancement of T-C for the DFH compared with that of random alloy with the same Mn concentration. In order to verify this enhancement mechanism of T-C, we confirm that higher 3d density of states at the Fermi level upon delta-doping is responsible for the enhancement of T-C due to the ferromagnetic double exchange interaction. (C) 2003 Published by Elsevier B.V.

引用

页码：1989 / 1990

页数：2

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