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Spin wave resonance in Ga1-xMnxAs

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14 Author(s)
Goennenwein, S.T.B. ; Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, D-85748 Garching, Germany ; Graf, T. ; Wassner, T. ; Brandt, M.S.
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We report ferromagnetic resonance experiments on Ga1-xMnxAs thin films. For the dc magnetic field perpendicular to the sample plane, we observe up to eight distinct resonances, which we attribute to spin wave modes. To account for the spacing of the resonances, we infer a linear gradient in the magnetic properties, which is ascribed to a linear variation of the uniaxial magnetic anisotropy with film thickness. Values of D=(1±0.4)×10-9Oe cm2 for the spin stiffness and JMnMn≈1 meV for the exchange integral between Mn spins are obtained. © 2003 American Institute of Physics.

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Applied Physics Letters  (Volume:82 ,  Issue: 5 )