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The search for room temperature tetragonal phases of Fe-Mn-Ga: A reactive crucible melting approach

Ener, Semih and Kroder, Johannes and Skokov, Konstantin P. and Gutfleisch, Oliver (2016):
The search for room temperature tetragonal phases of Fe-Mn-Ga: A reactive crucible melting approach.
In: Journal of Alloys and Compounds, Elsevier Science Publishing, pp. 198-204, 683, ISSN 09258388, [Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2016.05.069],
[Article]

Abstract

For the experimental search of new permanent magnet materials a bulk high-throughput method is needed. One possible method for bulk high-throughput screening is the simple and effective reactive crucible melting technique. In this work, we successfully applied reactive crucible melting to the Ni-Mn-Ga and Fe-Mn-Ga ternary Heusler systems. Energy dispersive X-ray spectroscopy was used for elemental analysis of phases formed in the crucibles which allowed us to construct parts of the room-temperature phase diagrams of Ni-Mn-Ga and Fe-Mn-Ga systems. By means of magneto-optical Kerr microscopy the phases with stripe domains - an essential feature of an uniaxial magnetic anisotropy- were identified and synthesized by conventional metallurgy. The structural/microstructural properties of the synthesized individual sample were investigated in addition to the magnetic properties. The most interesting hard magnetic material in Fe-Mn-Ga family is Mn38.5Fe32.5Ga29 with the remanent magnetization of 20 Am2kg−1 and a coercivity of 0.33 T at room temperature.

Item Type: Article
Erschienen: 2016
Creators: Ener, Semih and Kroder, Johannes and Skokov, Konstantin P. and Gutfleisch, Oliver
Title: The search for room temperature tetragonal phases of Fe-Mn-Ga: A reactive crucible melting approach
Language: English
Abstract:

For the experimental search of new permanent magnet materials a bulk high-throughput method is needed. One possible method for bulk high-throughput screening is the simple and effective reactive crucible melting technique. In this work, we successfully applied reactive crucible melting to the Ni-Mn-Ga and Fe-Mn-Ga ternary Heusler systems. Energy dispersive X-ray spectroscopy was used for elemental analysis of phases formed in the crucibles which allowed us to construct parts of the room-temperature phase diagrams of Ni-Mn-Ga and Fe-Mn-Ga systems. By means of magneto-optical Kerr microscopy the phases with stripe domains - an essential feature of an uniaxial magnetic anisotropy- were identified and synthesized by conventional metallurgy. The structural/microstructural properties of the synthesized individual sample were investigated in addition to the magnetic properties. The most interesting hard magnetic material in Fe-Mn-Ga family is Mn38.5Fe32.5Ga29 with the remanent magnetization of 20 Am2kg−1 and a coercivity of 0.33 T at room temperature.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 683
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Reactive crucible melting, Fe-Mn-Ga, Heusler alloys, Hard magnetic phases
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jul 2016 11:13
Official URL: http://dx.doi.org/10.1016/j.jallcom.2016.05.069
Identification Number: doi:10.1016/j.jallcom.2016.05.069
Funders: The authors thank the LOEWE project RESPONSE funded by the Ministry of Higher Education, Research and the Arts (HMWK) of the Hessen state.
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