Giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness in fully epitaxial magnetic tunnel junctions with a MgO barrier

被引：23

作者：

Marukame, Takao ^{[1
]}

Ishikawa, Takayuki ^{[1
]}

Taira, Tomoyuki ^{[1
]}

Matsuda, Ken-ichi ^{[1
]}

Uemura, Tetsuya ^{[1
]}

Yamamoto, Masafumi ^{[1
]}

机构：

[1] Hokkaido Univ, Div Elect Informat, Sapporo, Hokkaido 0600814, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 13期

关键词：

ROOM-TEMPERATURE; MAGNETORESISTANCE; FABRICATION;

D O I：

10.1103/PhysRevB.81.134432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Giant oscillations in spin-dependent tunneling resistances as a function of MgO barrier thickness (t(MgO)) were observed for fully epitaxial magnetic tunnel junctions with Heusler alloy Co2Cr0.6Fe0.4Al electrodes and a MgO barrier. The oscillations in tunneling resistances were well approximated by a superposition of an exponential function of exp(at(MgO)+b) and a periodic function of 1 + C cos[(2 pi/T)t(MgO)+phi] with significantly large amplitudes C similar to 0.16 +/- 0.01 even at 293 K for both parallel and antiparallel magnetization orientations. The period was found to be almost independent of temperature and bias voltage (V). The amplitudes C showed only weak dependence on V at least up to 0.2 V. These features should be a key to understand the origin of the pronounced oscillations.

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页数：5

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共 22 条

[1] Large magnetoresistance in Fe/MgO/FeCo(001) epitaxial tunnel junctions on GaAs(001) [J].

Bowen, M ;

Cros, V ;

Petroff, F ;

Fert, A ;

Boubeta, CM ;

Costa-Krämer, JL ;

Anguita, JV ;

Cebollada, A ;

Briones, F ;

de Teresa, JM ;

Morellón, L ;

Ibarra, MR ;

Güell, F ;

Peiró, F ;

Cornet, A .

APPLIED PHYSICS LETTERS, 2001, 79 (11) :1655-1657

[2] Spin-dependent tunneling conductance of Fe|MgO|Fe sandwiches -: art. no. 054416 [J].

Butler, WH ;

Zhang, XG ;

Schulthess, TC ;

MacLaren, JM .

PHYSICAL REVIEW B, 2001, 63 (05)

[3] 230% room-temperature magnetoresistance in CoFeB/MgO/CoFeB magnetic tunnel junctions [J].

Djayaprawira, DD ;

Tsunekawa, K ;

Nagai, M ;

Maehara, H ;

Yamagata, S ;

Watanabe, N ;

Yuasa, S ;

Suzuki, Y ;

Ando, K .

APPLIED PHYSICS LETTERS, 2005, 86 (09) :1-3

[4] High tunnel magnetoresistance in epitaxial Fe/MgO/Fe tunnel junctions [J].

Faure-Vincent, J ;

Tiusan, C ;

Jouguelet, E ;

Canet, F ;

Sajieddine, M ;

Bellouard, C ;

Popova, E ;

Hehn, M ;

Montaigne, F ;

Schuhl, A .

APPLIED PHYSICS LETTERS, 2003, 82 (25) :4507-4509

[5] Spintronics: A challenge for materials science and solid-state chemistry [J].

Felser, Claudia ;

Fecher, Gerhard H. ;

Balke, Benjamin .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2007, 46 (05) :668-699

[6] Slater-Pauling behavior and origin of the half-metallicity of the full-Heusler alloys [J].

Galanakis, I ;

Dederichs, PH ;

Papanikolaou, N .

PHYSICAL REVIEW B, 2002, 66 (17) :1-9

[7] SEARCH FOR HALF-METALLIC COMPOUNDS IN CO(2)MNZ (Z=IIIB, IVB, VB ELEMENT) [J].

ISHIDA, S ;

FUJII, S ;

KASHIWAGI, S ;

ASANO, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (06) :2152-2157

[8] Spin-dependent tunneling characteristics of fully epitaxial magnetic tunneling junctions with a full-Heusler alloy Co2MnSi thin film and a MgO tunnel barrier [J].

Ishikawa, T. ;

Marukame, T. ;

Kijima, H. ;

Matsuda, K. -I. ;

Uemura, T. ;

Arita, M. ;

Yamamoto, M. .

APPLIED PHYSICS LETTERS, 2006, 89 (19)

[9] Half-metallic electronic structure of Co2MnSi electrodes in fully epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions investigated by tunneling spectroscopy (invited) [J].

Ishikawa, Takayuki ;

Itabashi, Naoki ;

Taira, Tomoyuki ;

Matsuda, Ken-ichi ;

Uemura, Tetsuya ;

Yamamoto, Masafumi .

JOURNAL OF APPLIED PHYSICS, 2009, 105 (07)

[10] Fabrication of fully epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions [J].

Ishikawa, Takayuki ;

Hakamata, Shinya ;

Matsuda, Ken-ichi ;

Uemura, Tetsuya ;

Yamamoto, Masafumi .

JOURNAL OF APPLIED PHYSICS, 2008, 103 (07)