Influence of hydrogenation and mechanical grinding on the structural and ferromagnetic properties of GdFeSi

Chevalier, Bernard; Duttine, Mathieu; Wattiaux, Alain

Influence of hydrogenation and mechanical grinding on the structural and ferromagnetic properties of GdFeSi

2016

Chevalier, Bernard | Duttine, Mathieu | Wattiaux, Alain

Hydrogen insertion into GdFeSi induces (i) a structural transition from a tetragonal CeFeSi-type to a tetragonal ZrCuSiAs-type, (ii) an anisotropic expansion of the unit cell parameters because the a parameter decreases, whereas the c parameter increases, and (iii) a decrease in Curie temperature from 121 to 20 K. On the contrary, an amorphous ferromagnet (TC = 65 K) is obtained by mechanical grinding of GdFeSi. The three compounds (GdFeSi, GdFeSiH, and amorphous GdFeSi) were investigated by ⁵⁷Fe Mössbauer spectroscopy. At 4.2 K, this study has revealed that the magnetically ordered Gd substructure produces a small transferred hyperfine magnetic field at the ⁵⁷Fe nucleus.

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