Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Y. Huh, P. Kharel, V. R. Shah, X. Z. Li, R. Skomski, D. J. Sellmyer

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38 Scopus citations

Abstract

Nanostructured MnyGa ribbons with varying Mn concentrations including Mn1.2Ga, Mn1.4Ga, Mn1.6Ga, and Mn1.9Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y = 1.2, 1.4, and 1.6 prefers the tetragonal L10 structure and that with y = 1.9 prefers the D022 structure. We have found a maximum saturation magnetization of 621 emu/cm 3 in Mn1.2Ga which decreases monotonically to 300 emu/cm3 as y reaches 1.9. Although both the L10- and D022-MnyGa samples show a high Curie temperature (T c) well above room temperature, the value of Tc decreases almost linearly from 702 K for Mn1.9Ga to 551 K for Mn 1.2Ga. All the ribbons are metallic between 2 K and 300 K but the Mn1.2Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the MnyGa ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 0-MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites.

Original languageEnglish (US)
Article number013906
JournalJournal of Applied Physics
Volume114
Issue number1
DOIs
StatePublished - Jul 7 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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