In γ-Fe2MnGa Heusler alloy do Fe and Mn sublattices magnetically couple parallel or antiparallel at low temperatures?

E. C. Passamani, C. Larica, G. Viali, J. R. Andrez, A. Y. Takeuchi, V. P. Nascimento, Victor Antonio Peña Rodriguez, Chachi Rojas Ayala, E. Baggio-Saitovitch

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Bulk and local magnetic properties of the polycrystalline γ-Fe2MnGa Heusler alloy have been studied using X-ray diffraction, magnetization measurements and zero-field and in-field Mössbauer spectroscopy. X-ray diffraction data indicate stabilization of a L12-type structure and no structural phase transformation in the temperature range 30-300 K. While Mn atomic magnetic moments order magnetically well above 300 K according to magnetization data, 57Fe Mössbauer spectroscopy suggests that the Fe-sublattice ordering temperature is ca. 220 K, when it couples antiparallel to the Mn-sublattice. Large vertical (magnetization-axis) and horizontal (field-axis) magnetization loop shifts are observed in field-cooling process (up to 70 kOe); these effects may be associated with magnetic frustrated state that occurs by interaction of the two sublattices.

Original languageEnglish
Pages (from-to)164-169
Number of pages6
JournalJournal of Alloys and Compounds
Volume628
DOIs
StatePublished - 15 Apr 2015
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank FAPES , CNPq and UFES for the financial support.

Publisher Copyright:
©2014 Elsevier B.V. All rights reserved.

Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.

Keywords

  • Exchange bias effect
  • Hard magnetic materials
  • Heusler alloys
  • Mossbauer spectroscopy

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