Moment evolution across the ferromagnetic phase transition of giant magnetocaloric (Mn,Fe)2(P,Si,B) compounds

Abstract

A strong electronic reconstruction resulting in a quenching of the Fe magnetic moments has recently been predicted to be at the origin of the giant magnetocaloric effect displayed by Fe2Pbased materials. To verify this scenario, X-ray Magnetic Circular Dichroism experiments have been carried out at the L edges of Mn and Fe for two typical compositions of the (Mn,Fe)2(P,Si,B) system. The dichroic absorption spectra of Mn and Fe have been measured element specific in the vicinity of the first-order ferromagnetic transition. The experimental spectra are compared with first-principle calculations and charge-transfer multiplet simulations in order to derive the magnetic moments. Even though signatures of a metamagnetic behaviour are observed either as a function of the temperature or the magnetic field, the similarity of the Mn and Fe moment evolution suggests that the quenching of the Fe moment is weaker than previously predicted.

References in corpus (10)

• Magnetocaloric materials: the search for new systems
• Mixed Magnetism for Refrigeration and Energy Conversion
• Magnetic cooling at Risoe DTU
• Magneto-elastic coupling and magnetocaloric effect in hexagonal Mn-Fe-P-Si compounds
• Magnetocrystalline Anisotropy and the Magnetocaloric Effect in Fe2P
• Antiferromagnetic Exchange Interactions in Ni${}_2$Mn${}_{1.4}$In${}_{0.6}$ ferromagnetic Heusler alloy
• Magnetoelastic effects in doped Fe2P
• Order--disorder induced magnetic structures of FeMnP${}_{0.75}$Si${}_{0.25}$
• Temperature, magnetic field, and pressure dependence of the crystal and magnetic structures of the magnetocaloric compound Mn1.1Fe0.9(P0.8Ge0.2)
• The crystal and magnetic structure of the magnetocaloric compound FeMnP0.5Si0.5

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