Magnetic properties of clusters in IV-VI and II-IV-V2 diluted magnetic semiconductors

M. Górska; L. Kilanski; A. Podgórni; W. Dobrowolski; R. Szymczak; J. R. Anderson; I. V. Fedorchenko; S. F. Marenkin; V. E. Slynko; E. I. Slynko

doi:10.1117/12.2234914

21 December 2016 Magnetic properties of clusters in IV-VI and II-IV-V₂ diluted magnetic semiconductors

M. Górska, L. Kilanski, A. Podgórni, W. Dobrowolski, R. Szymczak, J. R. Anderson, I. V. Fedorchenko, S. F. Marenkin, V. E. Slynko, E. I. Slynko

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Proceedings Volume 10174, International Symposium on Clusters and Nanomaterials; 1017408 (2016) https://doi.org/10.1117/12.2234914
Event: International Symposium on Clusters and Nanomaterials, 2015, Richmond, Virginia, United States

Abstract

We have been studying magnetic properties of magnetic ion clusters in ternary, quaternary, and quinary IV-VI and II-IV-V₂ diluted magnetic semiconductors with varying concentrations of different magnetic and non-magnetic cations. We observed clusters of different types, from non-random distribution of magnetic ions in the host lattice to precipitates with the crystalline structure different from that of the host. The size of such precipitates varied from 200 nm to 20 μm. Depending on the type and size of clusters we observed different magnetic properties of the compounds, such as paramagnetic, spin-glass, spin-glass-like, or ferromagnetic states. For example, Zn_1-xMn_xGeAs₂ compounds with x ≤ 0.053 were paramagnetic with evidence of small short-range magnetic interactions, while in the same material with x ≥ 0.078 we observed room-temperature ferromagnetism. In IV-VI DMS clusters usually created a spin-glass or spinglass- like state. However, in some Ge_1-x-yPb_xMn_yTe crystals we observed a co-existence of two very different spin-glasslike states with transition temperatures T₁ ≈ 5 K and T₂ ≈ 90 K.

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M. Górska, L. Kilanski, A. Podgórni, W. Dobrowolski, R. Szymczak, J. R. Anderson, I. V. Fedorchenko, S. F. Marenkin, V. E. Slynko, and E. I. Slynko "Magnetic properties of clusters in IV-VI and II-IV-V₂ diluted magnetic semiconductors", Proc. SPIE 10174, International Symposium on Clusters and Nanomaterials, 1017408 (21 December 2016); https://doi.org/10.1117/12.2234914

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