Magnetocaloric Properties of MnBi Compound as a Function of Grain Size

Carmen Curcio; Elena S. Olivetti; Luca Martino; Michaela Küpferling; Vittorio Basso

doi:10.4028/www.scientific.net/SSP.257.143

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Magnetocaloric Properties of MnBi Compound as a Function of Grain Size

Abstract:

MnBi is a magnetic material with many peculiar properties, interesting for different applications such as rare-earth-free permanent magnets and magnetic refrigeration. In this work the entropy change and the transformation kinetics of the magneto-structural transition are investigated, for two sets of samples with different grain size (“as-annealed” and “compacted pwd”). Both sets show a logarithm dependence on the temperature scan rate of the transition temperature upon cooling. This suggests that thermal activation effects are present. The estimated activation volume v₀ of the magneto-structural transition corresponds to around 120 atoms.