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We report ferromagnetic and spin wave resonance absorption measurements onhigh quality epitaxially grown Ga_{1-x}Mn_{x}As thin films. We find that thesefilms exhibit robust ferromagnetic long-range order, based on the fact that upto seven resonances are detected at low temperatures, and the resonancestructure survives to temperatures close to the ferromagnetic transition. Onthe other hand, we observe a spin wave dispersion which is linear in modenumber, in qualitative contrast with the quadratic dispersion expected forhomogeneous samples. We perform a detailed numerical analysis of theexperimental data and provide analytical calculations to demonstrate that sucha linear dispersion is incompatible with uniform magnetic parameters. Ourtheoretical analysis of the ferromagnetic resonance data, combined with theknowledge that strain-induced anisotropy is definitely present in these films,suggests that a spatially dependent magnetic anisotropy is the most likelyreason behind the anomalous behavior observed.Comment: 9 pages, including 6 figure

physical review. b, condensed matter and materials physics

Anomalous behavior of spin-wave resonances in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">As</mml:mi></mml:math>thin films

Anomalous behavior of spin-wave resonances inGa1−xMnxAsthin films