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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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.
|Subjects:||Physical Science > Nanoelectronics|
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
|Deposited By:||Lesley Tobin|
|Deposited On:||11 Nov 2008 15:54|
|Last Modified:||19 Feb 2009 17:16|
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