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Temperature dependence of magnetic anisotropy of La0.8Ca0.2MnO3 epitaxial thin films

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7 Author(s)
Smoak, M.C. ; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599 ; Ryan, P.A. ; Tsui, F. ; Nath, T.K.
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Magnetic anisotropy of epitaxial La0.8Ca0.2MnO3(LCMO) thin films grown by pulsed laser deposition has been studied as a function of temperature and lattice strain. Pseudomorphic growth on (001) SrTiO3 substrates imposes an in-plane tensile stress on the LCMO films, which produces an easy-plane magnetic anisotropy in the growth plane, accompanied by a weak biaxial anisotropy in the easy plane. In contrast growth on (001) LaAlO3 substrates produces an in-plane compressive stress, which leads to an out-of-plane uniaxial easy axis. The observed behavior indicates the presence of a positive magnetostriction, and that the anisotropy energy is dominated by the epitaxial strain induced effects. Uniaxial magnetic anisotropy constants of 250 and 500 Å LCMO films have been determined by fitting the magnetization curves for temperatures between 5 and 200 K, and magnetostriction constants have been estimated subsequently. © 2000 American Institute of Physics.

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Journal of Applied Physics  (Volume:87 ,  Issue: 9 )