Abstract
In this work, we present the measurements of exchange-dominatednonpropagating surface and bulk spin-wave modes in the La-deficientepitaxial La0.7Mn1.3O3 films prepared by dc-magnetronsputtering. The angular and temperature dependences of the modes observedare discussed. The main result obtained is the observation of the spin-waveresonance (SWR) consisting of a series (17) of well resolved standingspin-wave modes in the perpendicular external magnetic field geometry. Thesurface spin-wave modes have been observed in manganites for the firsttime. As the magnetization is rotated out of perpendicular to the filmsurface, a `critical angle', φcr, is fixed, at which thesurface and first spin-wave modes have been transformed into the uniformmode. It is shown that only the uniform mode exists in the region0<φ<φcr. The surface mode data are consistent with thesurface-inhomogeneity model in which the surface-anisotropy field acts onthe surface spin. Possible origins of the surface anisotropy are discussed.Based on the temperature and angular dependences of SWR spectra, the mainmicroscopic parameters (the spin-wave stiffness, exchange constant andg-factor value) are established.
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