ACTA

Surface Magnetic Anisotropy of Epitaxial La_0.7Mn_1.3O_2.84 Thin Films

P. Aleshkevych^a, M. Baran^a, V. Dyakonov^a, R. Szymczak^a, H. Szymczak^a, K. Baberschke^b, J. Lindner^b and K. Lenz^b
^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 La_0.7Mn_1.3O_2.84 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 La_0.7Mn_1.3O_2.84 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