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 language | English |
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Pages (from-to) | 164-169 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 628 |
DOIs | |
State | Published - 15 Apr 2015 |
Bibliographical note
Funding Information:The authors thank FAPES , CNPq and UFES for the financial support.
Publisher Copyright:
©2014 Elsevier B.V. All rights reserved.
Keywords
- Exchange bias effect
- Hard magnetic materials
- Heusler alloys
- Mossbauer spectroscopy