Interlayer exchange coupling in Fe/MgO/Fe magnetic tunnel junctions

被引：122

作者：

Katayama, T. ^{[1
]}

Yuasa, S.

Velev, J.

Zhuravlev, M. Ye.

Jaswal, S. S.

Tsymbal, E. Y.

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[2] Univ Nebraska, Dept Phys, Lincoln, NE 68588 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 11期

基金：

美国国家科学基金会;

关键词：

ROOM-TEMPERATURE; MAGNETORESISTANCE; BARRIER; LAYERS; MGO;

D O I：

10.1063/1.2349321

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Interlayer exchange coupling (IEC) in fully epitaxial Fe/MgO/Fe(001) tunnel junctions with wedge-shaped MgO layers is measured at room temperature from the unidirectional shift of the Kerr hysteresis loop. It is found that the IEC is antiferromagnetic for small MgO thickness but changes sign at 0.8 nm. Ab initio calculations of IEC show that this behavior can be explained by the presence of O vacancies in the MgO barrier which makes IEC antiferromagnetic for thin barriers. With increasing MgO thickness the resonance contribution to IEC from localized defect states is reduced resulting in the ferromagnetic coupling typical for perfect MgO barriers. (c) 2006 American Institute of Physics.

引用

页数：3

共 21 条

[1] Effect of interface states on spin-dependent tunneling in Fe/MgO/Fe tunnel junctions [J].

Belashchenko, KD ;

Velev, J ;

Tsymbal, EY .

PHYSICAL REVIEW B, 2005, 72 (14)

[2] INTERLAYER EXCHANGE COUPLING - A UNIFIED PHYSICAL PICTURE [J].

BRUNO, P .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1993, 121 (1-3) :248-252

[3] THEORY OF INTERLAYER MAGNETIC COUPLING [J].

BRUNO, P .

PHYSICAL REVIEW B, 1995, 52 (01) :411-439

[4] MECHANISM FOR NON-HEISENBERG-EXCHANGE COUPLING BETWEEN FERROMAGNETIC LAYERS [J].

ERICKSON, RP ;

HATHAWAY, KB ;

CULLEN, JR .

PHYSICAL REVIEW B, 1993, 47 (05) :2626-2635

[5] Interlayer magnetic coupling interactions of two ferromagnetic layers by spin polarized tunneling [J].

Faure-Vincent, J ;

Tiusan, C ;

Bellouard, C ;

Popova, E ;

Hehn, M ;

Montaigne, F ;

Schuhl, A .

PHYSICAL REVIEW LETTERS, 2002, 89 (10)

[6] Tunneling in epitaxial Fe/Si/Fe structures with strong antiferromagnetic interlayer coupling [J].

Gareev, RR ;

Pohlmann, LL ;

Stein, S ;

Bürgler, DE ;

Grünberg, PA ;

Siegel, M .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :8038-8040

[7] STABILITY OF VACANCY DEFECTS IN MGO - THE ROLE OF CHARGE NEUTRALITY [J].

GIBSON, A ;

HAYDOCK, R ;

LAFEMINA, JP .

PHYSICAL REVIEW B, 1994, 50 (04) :2582-2592

[8] LAYERED MAGNETIC-STRUCTURES - EVIDENCE FOR ANTIFERROMAGNETIC COUPLING OF FE LAYERS ACROSS CR INTERLAYERS [J].

GRUNBERG, P ;

SCHREIBER, R ;

PANG, Y ;

BRODSKY, MB ;

SOWERS, H .

PHYSICAL REVIEW LETTERS, 1986, 57 (19) :2442-2445

[9] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set [J].

Kresse, G ;

Furthmuller, J .

PHYSICAL REVIEW B, 1996, 54 (16) :11169-11186

[10] Disorder, defects, and band gaps in ultrathin (001) MgO tunnel barrier layers [J].

Mather, P. G. ;

Read, J. C. ;

Buhrman, R. A. .

PHYSICAL REVIEW B, 2006, 73 (20)

← 1 2 3 →