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A single crystal of La0.7Sr0.3MnO3 was grown by the floating zone method. The ferromagnetic resonance linewidth at 8.5 GHz has a minimum of 50 Oe at 340 K and increases with lowering temperature. This is indicative of some residual inhomogeneity. The anisotropy of the resonance field was studied as a function of angle in the sample plane, and we find a small uniaxial anisotropy, Han≅230 Oe at 77 K.
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Lofland et al. (1997) studied this question.
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