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Theoretical description of the magnetocaloric effect in Mn-Fe-P-Si alloys.

Number: pap. 157

Author(s) : PIAZZI M., BENNATI C., CURCIO C., et al.

Summary

We apply a thermodynamic model describing magnetoelastic effects and based on mean field theory to understand the physical origin of the first order ferro- to paramagnetic magnetostructural transition occurring in Mn1.3Fe0.65P0.5Si0.5. The phenomenological parameters of the model are determined through comparison with the entropy data measured by Peltier calorimetry under magnetic field. The values obtained support the idea that: the phase transition is driven by the strong magnetoelastic coupling present along the a lattice axis; the spin entropy plays a key role in the transition; the structural contribution has a minor counteracting role. Moreover, the number of magnetic moments derived from the model agrees with the picture describing the paramagnetic phase of the system as due to the disordered magnetic moments at the Mn sites only.

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Details

  • Original title: Theoretical description of the magnetocaloric effect in Mn-Fe-P-Si alloys.
  • Record ID : 30019361
  • Languages: English
  • Source: 7th International Conference on Magnetic Refrigeration at Room Temperature (Thermag VII). Proceedings: Turin, Italy, September 11-14, 2016.
  • Publication date: 2016/09/11
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2016.0157

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