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| Magnetic Semiconductors Thin Films-Unidirectional Anisotropy |
| Journal of Magnetics, Volume 4, Number 1, 31 Mar 1999, Pages 33-37 |
| M. Lubecka(Department of Electronics. UM&M), L. J. Maksymowicz(Department of Electronics. UM&M), R. Szymczak(Insitute of Physics, Polish Academy of Sciences), W. Powroznik(Department of Electronics. UM&M) |
| Abstract |
| Unidirectional magnetic anisotropy field (Han) was investigated for thin films of CdCr2-2xIn2xSe4 (0≤x≤0.2). This anisotropy originates from the microscopic anisotropic Dzyaloshinskii-Moriya (DM) interaction which arise from the spin-orbit scattering of the conduction electrons by the nonmagnetic impurities. This interaction maintains the remanent magnetization in the direction of the initial applied field. Then the single easy direction of the magnetization is parallel to the direction of the magnetic field. The anisotropy produced by field cooling is unidirectional I.e. the spins system deeps some memory of the cooling field direction. The chalcogenide spinel of CdCr2-2xIn2xSe4 belongs to the class of the magnetic semiconductors. The magnetic disordered state is obtained when ferromagnetic structure is diluted by In. Then we have the mixed phase characterised by coexistence the magnetic long range ordering (IFN-infinite ferromagnetic network) and the spin glass order (Fc-finite clusters). The total magnetic anisotropy energy depends on the state of magnetic ordering. In our study we concentrated on the magnetic state with reentrant transition and spin glass state. The polycrystalline CdCr2-2xIn2xSe4 thin films were obtained by rf sputtering technique. We applied the ferromagnetic resonance (FMR) and M-H loop techniques for determining the temperature composition dependencies of Han. From the experimental data, we have found that Han decreases almost linearly when temperature is increased and in the low temperature is about three times bigger at SG state with comparison to the state with REE. |
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