Spin-Wave Resonance in Magnetic Semiconductor Thin Films - Experiment
L.J. Maksymowicz, M. Lubecka and W. Powroźnik
Institute of Electronics, Academy of Mining and Metallurgy, Al. Mickiewicza 30, Kraków, Poland
Received: March 21, 1991
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Magnetic properties of polycrystalline thin films of chromium chalcogenide spinels (CdCr2Se4 lightly doped with indium and CdCr2xIn2-2xSe4) were studied. The ferromagnetic (FMR) and spin-wave resonance (SWR) techniques were used to investigate the temperature dependences of both the spin-wave stiffness constant D and the saturation magnetization Ms. The resonance spectra were recorded in the temperature range extending from 4.2 K to 300 K. The influence of indium concentration on Ms(T) and D(T) was studied. It was shown that lightly doped samples (In/Cd < 1% at.) exhibited the ferromagnetic ordering with Ms(T) and D(T) being the linear functions of T3/2 and T5/2, respectively. Higher concentration of indium produced the reentrant transition and spin-glass state of magnetic ordering in CdCr2xIn2-2xSe4. The temperature dependence of Ms was also found from the FMR data for these two magnetic phases.
DOI: 10.12693/APhysPolA.80.653
PACS numbers: 73.60.Gx, 75.70.Ak