Magnetocrystalline anisotropy and its electric-field-assisted switching of Heusler-compound-based perpendicular magnetic tunnel junctions

被引：42

作者：

Bai, Zhaoqiang ^{[1
,2
,3
]}

Shen, Lei ^{[4
]}

Cai, Yongqing ^{[5
]}

Wu, Qingyun ^{[1
]}

Zeng, Minggang ^{[1
]}

Han, Guchang ^{[2
]}

Feng, Yuan Ping ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] ASTAR, Data Storage Inst, Singapore 117608, Singapore

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[4] Natl Univ Singapore, Engn Sci Programme, Singapore 117579, Singapore

[5] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore

来源：

NEW JOURNAL OF PHYSICS | 2014年 / 16卷

基金：

新加坡国家研究基金会;

关键词：

Heusler alloy; magnetic crystalline anisotropy; magnetoelectric effect; magnetic tunnel junction; non-collinear spin transport; TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE METHOD; AB-INITIO; NONCOLLINEAR MAGNETISM; BASIS-SET; SEMICONDUCTORS; FILMS; IRON;

D O I：

10.1088/1367-2630/16/10/103033

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Employing density functional theory combined with the non-equilibrium Green's function formalism, we systematically investigate the structural, magnetic and magnetoelectric properties of the Co2FeAl(CFA)/MgO interface, as well as the spin-dependent transport characteristics of the CFA/MgO/CFA perpendicular magnetic tunnel junctions (p-MTJs). We find that the structure of the CFA/MgO interface with the oxygen-top FeAl termination has high thermal stability, which is protected by the thermodynamic equilibrium limit. Furthermore, this structure is found to have perpendicular magnetocrystalline anisotropy (MCA). Giant electric-field-assisted modifications of this interfacial MCA through magnetoelectric coupling are demonstrated with an MCA coefficient of up to 10(-7) erg V-1 cm. In addition, our non-collinear spin transport calculations of the CFA/MgO/CFA p-MTJ predict a good magnetoresistance performance of the device.

引用

页数：18

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