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.

Magnetocaloric Properties of MnBi Compound as a Function of Grain Size / Curcio, Carmen; Olivetti, Elena S.; Martino, Luca; Kuepferling, Michaela; Basso, Vittorio. - 257:(2016), pp. 143-146. ((Intervento presentato al convegno International Conference on Solid Compounds of Transition Elements tenutosi a Zaragoza nel 11-15 Aprile 2016 [10.4028/www.scientific.net/SSP.257.143].

Magnetocaloric Properties of MnBi Compound as a Function of Grain Size

Olivetti, Elena S.;Martino, Luca;Kuepferling, Michaela;Basso, Vittorio
2016

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.
International Conference on Solid Compounds of Transition Elements
11-15 Aprile 2016
Zaragoza
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/54617
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