Magnetic Interactions in Granular Paramagnetic–Ferromagnetic GaAs: Mn/MnAs Hybrids
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- Heimbrodt, W., Klar, P.J., Ye, S. et al. J Supercond (2005) 18: 315. doi:10.1007/s10948-005-0001-6
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The magneto-transport properties of granular paramagnetic–ferromagnetic GaAs:Mn/MnAs hybrids have been studied. Positive and negative magnetoresistivity can be observed in the paramagnetic matrix as well as in the GaAs:Mn/MnAs hybrid system. The experimental results and the respective relevant interactions are discussed. A phenomenological explanation from a microscopic point of view is presented. It is suggested that the paramagnetism of the matrix plays a major role in the magneto-resistive behavior of the hybrids, in contrast to diamagnetic–ferromagnetic hybrids where the magnetoresistance (MR) is dominated by the ferromagnetism of the clusters.