Structural and magnetic properties of hexagonal (Mn,Fe)3-δGa
M.F.J. Boeije (TU Delft - RST/Fundamental Aspects of Materials and Energy)
L van Eijck (TU Delft - RST/Neutron and Positron Methods in Materials)
Niels Harmen H. Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)
E. H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We have investigated the crystallographic and magnetic properties of (Mn,Fe)3-δGa alloys. The hexagonal phase is stable between 600 and 700 °C and can be stabilized by quenching to room temperature. Mn3Ga is reported to be off-stoichiometric, but we show that using melt-spinning the stoichiometric compound is attainable. Below the antiferromagnetic transition temperature TN, the crystal undergoes a hexagonal to monoclinic transition at the distortion temperature Td. This gives rise to an in-plane rotation of the magnetic moments that is accompanied by a simultaneous increase in magnetization in a magnetic field of 1 T. Fe substitution for Mn removes the monoclinic distortion. Substitutional Fe weakens the antiferromagnetism and a paramagnetic to ferromagnetic transition is observed. The Mn sublattice couples antiparallel throughout the series. Substitution of Ga with Si preserves the monoclinic distortion.
help_outline