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

被引：41

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

共 71 条

[1] Bai Z., 2012, SPIN, V02, DOI [DOI 10.1142/S201032471230006X, 10.1142/S201032471230006X]
[2] Boron diffusion induced symmetry reduction and scattering in CoFeB/MgO/CoFeB magnetic tunnel junctions
Bai, Zhaoqiang
Shen, Lei
Wu, Qingyun
Zeng, Minggang
Wang, Jian-Sheng
Han, Guchang
Feng, Yuan Ping
[J]. PHYSICAL REVIEW B, 2013, 87 (01)
[3] PROJECTOR AUGMENTED-WAVE METHOD
BLOCHL, PE
[J]. PHYSICAL REVIEW B, 1994, 50 (24): : 17953 - 17979
[4] Density-functional method for nonequilibrium electron transport -: art. no. 165401
Brandbyge, M
Mozos, JL
Ordejón, P
Taylor, J
Stokbro, K
[J]. PHYSICAL REVIEW B, 2002, 65 (16) : 1654011 - 16540117
[5] Temperature insensitivity of the spin-polarization in Co2MnSi films on GaAs (001)
Branford, W. R.
Singh, L. J.
Barber, Z. H.
Kohn, A.
Petford-Long, A. K.
Van Roy, W.
Magnus, F.
Morrison, K.
Clowes, S. K.
Bugoslavsky, Y. V.
Cohen, L. F.
[J]. NEW JOURNAL OF PHYSICS, 2007, 9
[6] Brataas A, 2012, NAT MATER, V11, P372, DOI [10.1038/NMAT3311, 10.1038/nmat3311]
[7] Controlling magnetism on metal surfaces with non-magnetic means: electric fields and surface charging
Brovko, Oleg O.
Ruiz-Diaz, Pedro
Dasa, Tamene R.
Stepanyuk, Valeri S.
[J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 2014, 26 (09)
[8] Highly Spin-Polarized Conducting State at the Interface between Nonmagnetic Band Insulators: LaAlO3/FeS2 (001)
Burton, J. D.
Tsymbal, E. Y.
[J]. PHYSICAL REVIEW LETTERS, 2011, 107 (16)
[9] Giant Tunneling Electroresistance Effect Driven by an Electrically Controlled Spin Valve at a Complex Oxide Interface
Burton, J. D.
Tsymbal, E. Y.
[J]. PHYSICAL REVIEW LETTERS, 2011, 106 (15)
[10] Spin-dependent tunneling conductance of Fe|MgO|Fe sandwiches -: art. no. 054416
Butler, WH
Zhang, XG
Schulthess, TC
MacLaren, JM
[J]. PHYSICAL REVIEW B, 2001, 63 (05)

← 1 2 3 4 5 6 7 8 →