Anomalous behavior of spin-wave resonances in Ga1-xMn xAs thin films

T. G. Rappoport, P. Redliński, X. Liu, G. Zaránd, J. K. Furdyna, B. Jankó

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Abstract

We report ferromagnetic and spin-wave resonance absorption measurements on high quality epitaxially grown Ga1-xMnxAs thin films. We find that these films exhibit robust ferromagnetic long-range order, based on the fact that up to seven resonances are detected at low temperatures, and the resonance structure survives to temperatures close to the ferromagnetic transition. On the other hand, we observe a spin-wave dispersion, which is linear in mode number, in qualitative contrast with the quadratic dispersion expected for homogeneous samples. We perform a detailed numerical analysis of the experimental data and provide analytical calculations to demonstrate that such a linear dispersion is incompatible with uniform magnetic parameters. Our theoretical analysis of the ferromagnetic resonance data, combined with the knowledge that strain-induced anisotropy is definitely present in these films, suggests that a spatially dependent magnetic anisotropy is the most likely reason behind the anomalous behavior observed.

Original languageEnglish
Article number125213
Pages (from-to)1252131-1252139
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number12
Publication statusPublished - Mar 2004

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Rappoport, T. G., Redliński, P., Liu, X., Zaránd, G., Furdyna, J. K., & Jankó, B. (2004). Anomalous behavior of spin-wave resonances in Ga1-xMn xAs thin films. Physical Review B - Condensed Matter and Materials Physics, 69(12), 1252131-1252139. [125213].