Thickness dependence of magnetoresistance in La–Ca–Mn–O epitaxial films
- 24 July 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 67 (4) , 557-559
- https://doi.org/10.1063/1.115168
Abstract
Colossal magnetoresistance in excess of 106% has been obtained (at 110 K, H=6 T) in epitaxially grown La–Ca–Mn–O thin films. The as‐deposited film exhibits a substantial magnetoresistance value of 39 000%, which is further improved by heat treatment. The magnetoresistance is found to be strongly dependent on film thickness, with the value reaching the maxima at ∼1000 Å thickness, and then reduced by orders of magnitude when the film is made thicker than ∼2000 Å. This behavior is interpreted in terms of lattice strain in the La–Ca–Mn–O films.Keywords
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