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Abstract
The magnetisation of IV-VI diluted magnetic semiconductor systems has been measured at 4.2 K using the sample extraction method in steady magnetic fields up to 30 T. Measurements at lower temperatures have been made using pulsed magnetic fields. The results have been fitted to an expression containing a Brillouin function, representing isolated magnetic ions, plus a term representing pair interactions. The fitting parameters are: x1, the effective occupation probability of a cation site by an Mn2+ ion; T0, representing the exchange interaction between Mn2+ ions; x2, representing the number of Mn2+ ions in pairs; and Jp, a pair exchange parameter. Reasonable agreement of these high-field parameters with parameters obtained from the low-field susceptibility was found. Fits including the nearest-neighbour pair exchange function confirm the dominance of nearest-neighbour pairs in the antiferromagnetic exchange interaction.
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