Intergranular Magnetoresistance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>FeMoO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>from a Magnetic Tunnel Barrier Mechanism across Grain Boundaries
書誌事項
- 公開日
- 2007-04-12
- 権利情報
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- http://link.aps.org/licenses/aps-default-license
- DOI
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- 10.1103/physrevlett.98.157205
- 公開者
- American Physical Society (APS)
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説明
We present magnetization (M) and magnetoresistance (MR) data for a series of Sr2FeMoO6 samples with independent control on antisite defect and grain-boundary densities, which reveal several unexpected features, including a novel switching-like behavior of MR with M. These, in conjunction with model calculations, establish that the MR in Sr2FeMoO6 is dominantly controlled by a new mechanism, derived from the magnetic polarization of grain-boundary regions acting like spin valves, leading to behavior qualitatively different from that usually encountered in tunneling MR. We show that a simple and useful experimental signature for the presence of this spin-valve-type MR (SVMR) is a wider hysteresis in MR compared to that in M.
収録刊行物
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- Physical Review Letters
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Physical Review Letters 98 (15), 157205-, 2007-04-12
American Physical Society (APS)