Surface Magnetic Anisotropy of Epitaxial La0.7Mn1.3O2.84 Thin Films
P. Aleshkevycha, M. Barana, V. Dyakonova, R. Szymczaka, H. Szymczaka, K. Baberschkeb, J. Lindnerb and K. Lenzb
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
bInstitute für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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Received: 14 09 2005; Revised version: 30 01 2006; In final form: 31 05 2006;
A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La0.7Mn1.3O2.84 films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å2 was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La0.7Mn1.3O2.84 films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.
DOI: 10.12693/APhysPolA.110.57
PACS numbers: 76.50.+g, 75.70.-i