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Magnet properties of Mn70Ga30 prepared by cold rolling and magnetic field annealing

Ener, Semih and Skokov, Konstantin P. and Karpenkov, Dmitriy Yu. and Kuz'min, Michael D. and Gutfleisch, Oliver (2015):
Magnet properties of Mn70Ga30 prepared by cold rolling and magnetic field annealing.
In: Journal of Magnetism and Magnetic Materials, pp. 265-270, 382, ISSN 03048853, [Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2015.02.001],
[Article]

Abstract

The remanence and coercivity of arc melted Mn70Ga30 can be substantially improved by cold rolling. For best performance the rolled material should be annealed at T=730 K in the presence of a magnetic field of 1 T. The so-obtained magnet has a remanence of 0.239 T and a coercivity of 1.24 T at room temperature. The underlying reason for the high coercivity and remanence is the increase of the content of a metastable ferrimagnetic D022 phase at the expense of the normally stable anti-ferromagnetic D019. Magnetic field significantly increases the nucleation rate of the ferromagnetic D022 phase that leads to grain size refinement and as a consequence of improving remanence and coercive field.

Item Type: Article
Erschienen: 2015
Creators: Ener, Semih and Skokov, Konstantin P. and Karpenkov, Dmitriy Yu. and Kuz'min, Michael D. and Gutfleisch, Oliver
Title: Magnet properties of Mn70Ga30 prepared by cold rolling and magnetic field annealing
Language: English
Abstract:

The remanence and coercivity of arc melted Mn70Ga30 can be substantially improved by cold rolling. For best performance the rolled material should be annealed at T=730 K in the presence of a magnetic field of 1 T. The so-obtained magnet has a remanence of 0.239 T and a coercivity of 1.24 T at room temperature. The underlying reason for the high coercivity and remanence is the increase of the content of a metastable ferrimagnetic D022 phase at the expense of the normally stable anti-ferromagnetic D019. Magnetic field significantly increases the nucleation rate of the ferromagnetic D022 phase that leads to grain size refinement and as a consequence of improving remanence and coercive field.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 382
Uncontrolled Keywords: Permanent magnet, Mn–Ga, Plastic deformation, D022 phase
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: 16 Dec 2015 09:38
Official URL: http://dx.doi.org/10.1016/j.jmmm.2015.02.001
Identification Number: doi:10.1016/j.jmmm.2015.02.001
Funders: S. Ener is grateful to the European Community's Seventh Framework Programme for supporting this study with FP7/2007-2013 under Grant agreement number 280670 (Rare Earth Free Permanent Magnets – REFREEPERMAG)., K.P. Skokov acknowledges the support of the G8 Research Councils Initiative on Multilateral Research Funding under Grant agreement number 597810 (High Performance Permanent Magnets Sustainable for Next Generation – HPPMSNG.)., O. Gutfleisch gratefully acknowledges the financial support by the German Federal State of Hessen through its excellence programme LOEWE “RESPONSE”.
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