Step-edge magnetoresistance in La0.7Ca0.3MnO3 films
- 8 March 1999
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 74 (10), 1481-1483
- https://doi.org/10.1063/1.123587
Abstract
The magnetoresistance of step-edge structures in La0.7Ca0.3MnO3 films was investigated. Step-edge arrays with 200 steps of height 140–200 nm and step separation 20 μm along [110] were fabricated on LaAlO3 substrates by chemically assisted ion-beam etching. Thin La0.7Ca0.3MnO3 films were deposited on the structured substrates by pulsed-laser deposition. Measurements of the large low-field magnetoresistance, the dynamic conductance, and the anisotropic magnetoresistance lead to the proposal of a model of spin-polarized tunneling in a ferromagnet/spin-glass/ferromagnet geometry.Keywords
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