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Spin-wave resonances and surface spin pinning in Ga<sub>1−x</sub>Mn<sub>x</sub>As thin films

Spin-wave resonances and surface spin pinning in Ga1−xMnxAs thin films

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BIHLER, Christoph, Wladimir SCHOCH, Wolfgang LIMMER, Sebastian T. B. GÖNNENWEIN, Martin S. BRANDT, 2009. Spin-wave resonances and surface spin pinning in Ga1−xMnxAs thin films. In: Physical Review B. American Physical Society (APS). 79(4), 045205. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.79.045205

@article{Bihler2009Spinw-52594, title={Spin-wave resonances and surface spin pinning in Ga1−xMnxAs thin films}, year={2009}, doi={10.1103/PhysRevB.79.045205}, number={4}, volume={79}, issn={2469-9950}, journal={Physical Review B}, author={Bihler, Christoph and Schoch, Wladimir and Limmer, Wolfgang and Gönnenwein, Sebastian T. B. and Brandt, Martin S.}, note={Article Number: 045205} }

2009 Bihler, Christoph Gönnenwein, Sebastian T. B. Schoch, Wladimir terms-of-use We investigate the dependence of the spin-wave resonance (SWR) spectra of Ga<sub>0.95</sub>Mn<sub>0.05</sub>As thin films on the sample treatment. We find that for the external magnetic field perpendicular to the film plane, the SWR spectrum of the as-grown thin films and the changes upon etching and short-term hydrogenation can be quantitatively explained via a linear gradient in the uniaxial magnetic anisotropy field in growth direction. The model also qualitatively explains the SWR spectra observed for the in-plane easy-axis orientation of the external magnetic field. Furthermore, we observe a change in the effective surface spin pinning of the partially hydrogenated sample, which results from the tail in the hydrogen-diffusion profile. The latter leads to a rapidly changing hole concentration/magnetic anisotropy profile acting as a barrier for the spin-wave excitations. Therefore, short-term hydrogenation constitutes a simple method to efficiently manipulate the surface spin pinning. Limmer, Wolfgang Schoch, Wladimir Limmer, Wolfgang Brandt, Martin S. 2021-01-28T10:36:56Z Gönnenwein, Sebastian T. B. eng 2021-01-28T10:36:56Z Spin-wave resonances and surface spin pinning in Ga<sub>1−x</sub>Mn<sub>x</sub>As thin films Bihler, Christoph Brandt, Martin S.

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