Strong quantum interference effect in fully epitaxial Cr/Fe/MgO/Fe magnetic tunnel junctions with ultrathin-Fe electrodes at room temperature

被引：5

作者：

Bang, Do ^{[1
]}

Nozaki, T. ^{[1
]}

Suzuki, Y. ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 07期

关键词：

MAGNETORESISTANCE;

D O I：

10.1063/1.3556780

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spin-dependent transport in high quality fully epitaxial magnetic tunneling junctions with structure of ultrathin-Fe(001)/MgO(001)/Fe(001) on a crystalline Cr(001) buffer which is employed as a spin-reflection layer has been investigated. We successfully observed an oscillation of conductance with respect to the Fe-wedge thickness with about a 2 monatomic-layer period. Also, we observed clear quantum interference effect both in tunneling spectra and differential tunneling magnetoresistance curves of the samples even at room temperature. The tunneling magnetoresistance is clearly modulated at the bias voltages corresponding to the resonant peaks. Spin-torque diode spectra of the junctions with ultrathin-Fe electrodes were also measured under various bias voltages. From these results, we proved that the spin-dependent transport in the magnetic tunnel junctions can be modulated by introducing quantum well states in the structure. (C) 2011 American Institute of Physics. [doi:10.1063/1.3556780]

引用

收藏

页数：3

相关论文

共 14 条

[1] Inelastic tunneling spectra of MgO barrier magnetic tunneling junctions showing large magnon contribution [J].

Bang, Do ;

Nozaki, T. ;

Djayaprawira, D. D. ;

Shiraishi, M. ;

Suzuki, Y. ;

Fukushima, A. ;

Kubota, H. ;

Nagahama, T. ;

Yuasa, S. ;

Maehara, H. ;

Tsunekawa, K. ;

Nagamine, Y. ;

Watanabe, N. ;

Itoh, H. .

JOURNAL OF APPLIED PHYSICS, 2009, 105 (07)

[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] Quantitative measurement of voltage dependence of spin-transfer torque in MgO-based magnetic tunnel junctions [J].

Kubota, Hitoshi ;

Fukushima, Akio ;

Yakushiji, Kay ;

Nagahama, Taro ;

Yuasa, Shinji ;

Ando, Koji ;

Maehara, Hiroki ;

Nagamine, Yoshinori ;

Tsunekawa, Koji ;

Djayaprawira, David D. ;

Watanabe, Naoki ;

Suzuki, Yoshishige .

NATURE PHYSICS, 2008, 4 (01) :37-41

[4] Spin-dependent resonant tunneling through quantum-well states in magnetic metallic thin films [J].

Lu, ZY ;

Zhang, XG ;

Pantelides, ST .

PHYSICAL REVIEW LETTERS, 2005, 94 (20)

[5] Theory of tunneling magnetoresistance in a junction with a nonmagnetic metallic interlayer [J].

Mathon, J ;

Umerski, A .

PHYSICAL REVIEW B, 1999, 60 (02) :1117-1121

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

Mathon, J ;

Umerski, A .

PHYSICAL REVIEW B, 2001, 63 (22)

[7] Oscillation of giant tunneling magnetoresistance with respect to tunneling barrier thickness in fully epitaxial Fe/MgO/Fe magnetic tunnel junctions [J].

Matsumoto, Rie ;

Fukushima, Akio ;

Nagahama, Taro ;

Suzuki, Yoshishige ;

Ando, Koji ;

Yuasa, Shinji .

APPLIED PHYSICS LETTERS, 2007, 90 (25)

[8] Enhanced tunnel magnetoresistance due to spin dependent quantum well resonance in specific symmetry states of an ultrathin ferromagnetic electrode [J].

Niizeki, Tomohiko ;

Tezuka, Nobuki ;

Inomata, Koichiro .

PHYSICAL REVIEW LETTERS, 2008, 100 (04)

[9] Quantum oscillation of the tunneling conductance in fully epitaxial double barrier magnetic tunnel junctions [J].

Nozaki, T ;

Tezuka, N ;

Inomata, K .

PHYSICAL REVIEW LETTERS, 2006, 96 (02)

[10] QUANTUM-WELL STATES AND MAGNETIC COUPLING BETWEEN FERROMAGNETS THROUGH A NOBLE-METAL LAYER [J].

ORTEGA, JE ;

HIMPSEL, FJ ;

MANKEY, GJ ;

WILLIS, RF .

PHYSICAL REVIEW B, 1993, 47 (03) :1540-1552