Structural and magnetic properties of hexagonal (Mn,Fe)<sub>3-δ</sub>Ga

Journal article (2017)

Authors

M.F.J. Boeije RST/Fundamental Aspects of Materials and Energy - AS
L. van Eijck RST/Neutron and Positron Methods in Materials - AS
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
Copyright: © 2017 M.F.J. Boeije, L. van Eijck, N.H. van Dijk, E.H. Brück
DOI
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https://doi.org/10.1016/j.jmmm.2017.02.058
Antiferromagnetic spintronics Magnetoelastic transition Triangular antiferromagnet
More Info
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Published Date

01-07-2017

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

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.