Magneto-elastic coupling and magnetocaloric effect in hexagonal Mn-Fe-P-Si compounds

Abstract

Structural, magnetic and magnetocaloric properties of Fe2P-based Mn-Fe-P-Si compounds were investigated. The study reveals a large magneto-elastic coupling that starts to develop in the paramagnetic state and grows when the ferromagnetic transition temperature is approached. Based on the behavior of the magneto-elastic coupling, we show the thermal evolution of the magnetic moments. On cooling, magnetic moments on the tetrahedral site form and gradually increase in the paramagnetic state. At the magnetic ordering temperature the moments attain a much larger value in a discontinuous step. We also find that the hysteresis and magnetic entropy change are correlated with discontinuous changes in the lattice parameters at the transition temperature. Small hysteresis can be obtained while maintaining giant magnetocaloric effect.

7 pages, 6 figures, 1 table

References in corpus (4)

• Mixed Magnetism for Refrigeration and Energy Conversion
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• Giant magneto-elastic coupling in a metallic helical metamagnet
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Cited by in corpus (4)

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• Site-specific atomic substitution in a giant magnetocaloric Fe${}_2$P-type system