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Translating reproducible phase-separated texture in manganites into reproducible two-state low-field magnetoresistance: An imaging and transport study

Israel, C and Granja, L and Chuang, T. M. and Hueso, L. E. and Sanchez, D and Prieto, J. L. and Levy, P and de Lozanne, A and Mathur, N. D. (2008) Translating reproducible phase-separated texture in manganites into reproducible two-state low-field magnetoresistance: An imaging and transport study. PHYSICAL REVIEW B, 78 (5).

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Abstract

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 (similar to 10(-12) Omega m(2)) 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.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
ID Code:138
Deposited By:Lesley Tobin
Deposited On:11 Nov 2008 15:54
Last Modified:19 Feb 2009 17:16

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