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자료유형
학술저널
저자정보
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.4 No.1
발행연도
1999.3
수록면
33 - 37 (5page)

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Unidirectional magnetic anisotropy field (Hαn) was investigated for thin films of CdCr_(2-2X)In_(2X)Se₄ (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 keeps some memory of the cooling field direction. The chalcogenide spinel of CdCr_(2-2X)In_(2X)Se₄ 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 CdCr_(2-2X)In_(2X)Se₄ 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 Hαn. From the experimental data, we have found that Hαn 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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Abstract

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusion

References

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