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Observation of Combined Ferromagnetic/Paramagnetic Phase in Ga1−xMn x As by Magnetic Circular Dichroism

Abstract

Magnetic properties of a series of Ga1−xMn x As layers with different Mn and hole concentrations has been studied by measuring magneto-absorption and magnetic circular dichroism (MCD). We first focus on comparing the MCD spectra of samples with unambiguous ferromagnetic or paramagnetic magnetization. We then investigate MCD in a sample with parameters between these two extremes, and interpret the observed behavior in terms of the coexistence of ferromagnetic domains and paramagnetic regions that may result, for example, from inhomogeneities in the sample caused, e.g., by compositional or doping fluctuations.

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Correspondence to K. J. Yee.

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Yee, K.J., Chakarvorty, R., Lim, W.L. et al. Observation of Combined Ferromagnetic/Paramagnetic Phase in Ga1−xMn x As by Magnetic Circular Dichroism. J Supercond 18, 131–135 (2005). https://doi.org/10.1007/s10948-005-2164-6

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  • DOI: https://doi.org/10.1007/s10948-005-2164-6

Keywords

  • ferromagnetic semiconductors
  • GaMnAs
  • magnetic circular dichroism