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On the magnetic properties of RFe11TiHx compounds

O. ISNARD1,* , M. GUILLOT2

Affiliation

  1. Institut Néel, CNRS, associé à l’Université J. Fourier de Grenoble, avenue des martyrs, BP166, 38042 Grenoble, Cédex 9, France
  2. aLaboratoire des Champs Magnétiques Intenses, CNRS, avenue des martyrs, BP166, 38042 Grenoble, Cédex 9, France

Abstract

Hydrogen atoms insertion within the crystal structure of the RFe11Ti compounds induces a significant modification of the physical properties. This includes an anisotropic unit cell expansion as well as a large increase of the Curie temperature. Other magnetic properties such as the magnetocrystalline anisotropy are also affected by H insertion within the lattice. The magnetic phase diagram of the TmFe11TiHx and TbFe11TiHx compounds have been investigated by combining neutron diffraction, magnetic measurements as well as high magnetic field measurements. The competition between the magnetocrystalline anisotropy terms can lead to spin reorientation phenomena in RFe11TiH with some rare-earth whereas for some others like Tb the spin reorientation transitions observed in the TbFe11Ti compounds has disappeared. In the case of the Tm compound a uniaxial character is observed up to the Curie temperature..

Keywords

Hard magnetic materials, Hydrogen, Magnetic phase diagram, Interstitial element, RFe11TiHx.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

O. ISNARD, M. GUILLOT, On the magnetic properties of RFe11TiHx compounds, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 744-749 (2008)