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Fe2MnGe: A Hexagonal Heusler Analogue

Published

Author(s)

S. Keshavarz, N. Naghibolashrafi, Michelle Elizabeth Jamer, K. Vinson, D. Mazumdar, Cindi L. Dennis, William D. Ratcliff, Julie A. Borchers, A. Gupta, P. LeClair

Abstract

Fe2MnGe is a potential half-metallic full-Heusler L21 ferromagnetic compound with large spin polarization ({approximately equal}97%) useful for various spintronic applications according to our first principles calculations using density functional theory. We therefore synthesized polycrystalline samples using arc-melting and post thermal treatments. our experimental investifations revealed that Fe2MnGe crystallizes in a stable hexagonal DO19 phase, with a high saturation magnetization of approximately 5υB/f.u. at Τ = 5 K and an estimated Curie temperature of Τc~505 K. Large magnetocrystalline anisotropy and the possibility of half-metallicity presents Fe2MnGe as a candidate for spin-torque-transfer RAM and other magnetic memory applications. Although, no sample has shown the pure cubic phase during these investigations, the neutron diffraction investigations were suggestive of a low temperature cubic or tetragonal phase which can be achieved by structural transformations.
Citation
Journal of Alloys and Compounds
Volume
771

Keywords

Heusler
Created August 20, 2018, Updated November 19, 2018