Voltage and temperature dependence of the grain boundary tunneling magnetoresistance in manganites

被引：68

作者：

Höfener, C ^{[1
]}

Philipp, JB ^{[1
]}

Klein, J ^{[1
]}

Alff, L ^{[1
]}

Marx, A ^{[1
]}

Büchner, B ^{[1
]}

Gross, R ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

EUROPHYSICS LETTERS | 2000年 / 50卷 / 05期

关键词：

D O I：

10.1209/epl/i2000-00324-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed a systematic analysis of time voltage and temperature dependence of the tunneling magnetoresistance (TMR) of grain boundaries (GB) in the manganites. We find a strong decrease of the TMR with increasing voltage and temperature. The decrease of the TMR with increasing voltage scales with an increase of time inelastic tunneling current due to multi-step inelastic tunneling via localized defect, states in the tunneling barrier. This behavior can be described, within a three-current model for magnetic tunnel junctions that extends thc two-current Julliere model by adding an inelastic, spin-independent tunneling contribution. Our analysis gives strong evidence that the observed drastic decrease of the GB-TMR in manganites is caused by an imperfect tunneling barrier.

引用

页码：681 / 687

页数：7

共 27 条

[1] GIANT MAGNETORESISTANCE IN HETEROGENEOUS CU-CO ALLOYS [J].

BERKOWITZ, AE ;

MITCHELL, JR ;

CAREY, MJ ;

YOUNG, AP ;

ZHANG, S ;

SPADA, FE ;

PARKER, FT ;

HUTTEN, A ;

THOMAS, G .

PHYSICAL REVIEW LETTERS, 1992, 68 (25) :3745-3748

[2] Magnetoresistance of chromium dioxide powder compacts [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Barry, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818

[3] Powder magnetoresistance (invited) [J].

Coey, JMD .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5576-5581

[4] The magnetic stability of spin-dependent tunneling devices [J].

Gider, S ;

Runge, BU ;

Marley, AC ;

Parkin, SSP .

SCIENCE, 1998, 281 (5378) :797-799

[5]

Glazman L. I., 1988, Soviet Physics - JETP, V67, P1276

[6] Physics and technology of high temperature superconducting Josephson junctions [J].

Gross, R ;

Alff, L ;

Beck, A ;

Froehlich, OM ;

Koelle, D ;

Marx, A .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1997, 7 (02) :2929-2935

[7] TRANSPORT PROCESSES AND NOISE IN YBA2CU3O7-DELTA GRAIN-BOUNDARY JUNCTIONS [J].

GROSS, R ;

MAYER, B .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1991, 180 (1-4) :235-242

[8] Physics of grain boundaries in the colossal magnetoresistance manganites [J].

Gross, R ;

Alff, L ;

Büchner, B ;

Freitag, BH ;

Höfener, C ;

Klein, J ;

Lu, YF ;

Mader, W ;

Philipp, JB ;

Rao, MSR ;

Reutler, P ;

Ritter, S ;

Thienhaus, S ;

Uhlenbruck, S ;

Wiedenhorst, B .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 211 (1-3) :150-159

[9]

Gubkin M. K., 1993, Physics of the Solid State, V35, P728

[10]

GUPTA A, 1996, PHYS REV B, V54, pR1562

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