Spin-dependent tunneling spectroscopy in single-crystal Fe/MgO/Fe tunnel junctions

被引：57

作者：

Ando, Y

Miyakoshi, T

Oogane, M

Miyazaki, T

Kubota, H

Ando, K

Yuasa, S

机构：

[1] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

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

[3] JST, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 14期

关键词：

D O I：

10.1063/1.2077861

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a detailed spin-dependent tunneling spectroscopy in single-crystal Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions (MTJs) that show a giant tunnel magnetoresistance effect. Spectra for antiparallel magnetic configurations show asymmetry because of extrinsic electron scatterings caused by structural defects at the barrier/electrode interfaces. Surprisingly, spectra for parallel magnetic configurations exhibit a complex oscillatory structure that has never been observed in conventional MTJs with an aluminum-oxide tunnel barrier. The complex spectra reflect the tunneling process via interface resonant states. These results provide some information that helps to elucidate the physics of spin-dependent electron tunneling and to further enhance magnetoresistance. (C) 2005 American Institute of Physics.

引用

页码：1 / 3

页数：3

共 13 条

[1] Magnon-assisted inelastic excitation spectra of a ferromagnetic tunnel junction [J].

Ando, Y ;

Murai, J ;

Kubota, H ;

Miyazaki, T .

JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) :5209-5211

[2] Tunneling of electrons in conventional and half-metallic systems: Towards very large magnetoresistance [J].

Bratkovsky, AM .

PHYSICAL REVIEW B, 1997, 56 (05) :2344-2347

[3] 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)

[4] 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

[5]

HANSMA PK, 1977, PHYS REP PHYS LETT C, V39, P147

[6] Spin-dependent inelastic electron tunneling spectroscopy of magnetic tunnel junctions [J].

Hayashi, M ;

Ando, Y ;

Oogane, M ;

Kubota, H ;

Miyazaki, T .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2004, 43 (11A) :7472-7476

[7] Theory of tunneling magnetoresistance of an epitaxial Fe/MgO/Fe(001) junction [J].

Mathon, J ;

Umerski, A .

PHYSICAL REVIEW B, 2001, 63 (22)

[8] Interface magnetism and spin wave scattering in ferromagnet-insulator-ferromagnet tunnel junctions [J].

Moodera, JS ;

Nowak, J ;

van de Veerdonk, RJM .

PHYSICAL REVIEW LETTERS, 1998, 80 (13) :2941-2944

[9]

MURAI J, 1998, J MAGN SOC JPN, V22, P573

[10] Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers [J].

Parkin, SSP ;

Kaiser, C ;

Panchula, A ;

Rice, PM ;

Hughes, B ;

Samant, M ;

Yang, SH .

NATURE MATERIALS, 2004, 3 (12) :862-867

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