Abstract
Unusual magnetic properties are found in ultrathin La0.9Sr0.1MnO3 films by systematically investigating the films with the thicknesses varying from 200 to 6 unit cells. Post annealing in oxygen can significantly enhance the Curie temperature and saturation magnetization by complementing oxygen vacancies. We observe that oxygen vacancies around the surfaces are much more than those close to the interfaces using an aberration-corrected scanning transmission electron microscopy for both the as-grown and post-annealed ultrathin films. The Curie temperature up to 325 K, much higher than that of the bulk, is found in the annealed films with the thickness of 50 unit cells.
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