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High Magnetic Field Annealing of Mn-Ga IntermetallicAlloys

Published online by Cambridge University Press:  21 December 2015

Daniel R. Brown ,
Ke Han ,
Theo Siegrist ,
Tiglet Besara  and
Rongmei Niu
Daniel R. Brown*
Affiliation:
Department of Material Science and Engineering, Florida State University, Tallahassee, FL 32304 National High Magnetic Field Laboratory, Tallahassee, FL 32310
Ke Han
Affiliation:
National High Magnetic Field Laboratory, Tallahassee, FL 32310
Theo Siegrist
Affiliation:
National High Magnetic Field Laboratory, Tallahassee, FL 32310 Department of Chemical Engineering, Florida Agricultural and Mechanical University-Florida State University, Tallahassee, FL 32304
Tiglet Besara
Affiliation:
National High Magnetic Field Laboratory, Tallahassee, FL 32310
Rongmei Niu
Affiliation:
National High Magnetic Field Laboratory, Tallahassee, FL 32310
*
*(Email: [email protected])
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Abstract

Mn-Ga alloys have shown promising hard magnetic properties, even though thesealloys contain no rare-earth metals. However, much work is needed before Mn-Gaalloys become viable permanent magnets for applications. One of the challengesis to enhance the remanence. One technique to improve this property is applyinga magnetic field during the heat treatment process. Magnetic annealing canpromote phase transformation of the phases with high magnetic moment. Thisresults in an increased remanence. Bulk samples of Mn-Ga alloys were made bymechanically alloying in order to create a nanostructured composite, followed byheat treatments in the presence of a 31 T magnetic field. The heat treatmenttemperatures were kept low in order to keep the refined microstructure. All thealloys exhibit hard magnetic properties at room temperature with largecoercivity. This work reports findings of magnetic field annealed Mn-Ga bulkthat exhibit high coercivities up to 19.4 kOe and increased remanence of 50%over the binary system, achieving values up to 6.9 emu/g. This is the highestcoercivity reported in bulk Mn-Ga samples.

Keywords

magnetic propertiesannealingmechanical alloying
Type
Articles
Information
MRS Advances , Volume 1 , Issue 3: Nanomaterials and Synthesis , 2016 , pp. 227 - 233
Copyright
Copyright © Materials Research Society 2015 

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References

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