Mesoscale magnetism at the grain boundaries in colossal magnetoresistive films

Details Mesoscale magnetism at the grain boundaries in colossal magnetoresistive films Mesoscale magnetism at the grain boundaries in colossal magnetoresistive films

2000-07-10

arxiv.org/abs/cond-mat/0007169v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages of text, 4 figures

Scientific paper

10.1103/PhysRevB.63.020402

We report the discovery of mesoscale regions with distinctive magnetic properties in epitaxial La$_{1-x}$Sr$_{x}$MnO$_{3}$ films which exhibit tunneling-like magnetoresistance across grain boundaries. By using temperature-dependent magnetic force microscopy we observe that the mesoscale regions are formed near the grain boundaries and have a different Curie temperature (up to 20 K {\it higher}) than the grain interiors. Our images provide direct evidence for previous speculations that the grain boundaries in thin films are not magnetically and electronically sharp interfaces. The size of the mesoscale regions varies with temperature and nature of the underlying defect.

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