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Abstract
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| In thin-film La0.6Ca0.4MnO3, conducting-tip and magnetic force microscopy reveal a pattern of nanoscale phase separation that is reproducible across cooling runs. This pattern represents the intersection of buried three-dimensional filamentary ferromagnetic metallic pathways with the sample surface. As an interlayer in current-perpendicular-to-the-plane trilayer devices, this phase-separated material magnetically decouples ferromagnetic metallic La0.7Ca0.3MnO3 electrodes which switch sharply. This yields sharp two-state low-field magnetoresistance that is also reproducible across cooling runs. The reproducibility and the magnitude of the resistance jump are linked to highly resistive 10−12 m2 constrained domain walls in the pathways of the phase-separated interlayer. Phase separation is normally associated with high-field colossal magnetoresistance and, therefore, its exploitation here to produce low-field effects is unusual. | |
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International
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Si |
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JCR
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Si |
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Title
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PHYSICAL REVIEW B |
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ISBN
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1098-0121 |
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Impact factor JCR
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3,172 |
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Impact info
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Volume
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78 |
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10.1103/PhysRevB.78.054409 |
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Journal number
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0 |
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From page
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054409 |
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To page
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054409-5 |
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Month
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AGOSTO |
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Ranking
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