Large-tunneling anisotropic magneto-Seebeck effect in a CoPt/MgO/Pt tunnel junction

被引：10

作者：

Amin, V. P. ^{[1
]}

Zemen, J. ^{[2
]}

Zelezny, J. ^{[3
,4
]}

Jungwirth, T. ^{[3
,5
]}

Sinova, Jairo ^{[1
,3
,6
]}

机构：

[1] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Dept Phys, London SW7 2AZ, England

[3] Inst Phys ASCR, Vvi, Prague 16253 6, Czech Republic

[4] Charles Univ Prague, Fac Math & Phys, Prague 12116 2, Czech Republic

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

[6] Johannes Gutenberg Univ Mainz, Inst Phys, D-55128 Mainz, Germany

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 14期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

D O I：

10.1103/PhysRevB.90.140406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate the tunneling anisotropic magneto-Seebeck effect in a realistically modeled CoPt/MgO/Pt tunnel junction using coherent transport calculations. For comparison we study the tunneling magneto-Seebeck effect in CoPt/MgO/CoPt as well. We find that the magneto-Seebeck ratio of CoPt/MgO/Pt exceeds that of CoPt/MgO/CoPt for small barrier widths, reaching 175% at room temperature. This provides a sharp contrast to the magnetoresistance, in which CoPt/MgO/CoPt performs better by one order of magnitude for all barrier widths. Thus, by switching from two ferromagnetic layers to one (so that spin-orbit coupling alone governs the magnetic transport anisotropy), the magnetoresistance ratio diminishes while the magneto-Seebeck ratio remains comparable or improves considerably. We therefore demonstrate that magnetic tunability can increase when caused solely by spin-orbit coupling. This result sheds light on the role that spin-orbit coupling plays in magnetically tuning the properties of tunnel junctions.

引用

页数：5

共 20 条

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