High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys
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High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys Daniel R. Brown, Ke Han, Theo Siegrist, Tiglet Besara and Rongmei Niu MRS Advances / Volume 1 / Issue 03 / January 2016, pp 227 - 233 DOI: 10.1557/adv.2015.26, Published online: 21 December 2015
Link to this article: http://journals.cambridge.org/abstract_S2059852115000262 How to cite this article: Daniel R. Brown, Ke Han, Theo Siegrist, Tiglet Besara and Rongmei Niu (2016). High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys. MRS Advances, 1, pp 227-233 doi:10.1557/adv.2015.26 Request Permissions : Click here
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MRS Advances © 2015 Materials Research Society DOI: 10.1557/adv.2015.26
High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys Daniel R. Brown1,2, Ke Han2, Theo Siegrist2,3, Tiglet Besara2, Rongmei Niu2 1
Department of Material Science and Engineering, Florida State University, Tallahassee, FL 32304 National High Magnetic Field Laboratory, Tallahassee, FL 32310 Department of Chemical Engineering, Florida Agricultural and Mechanical University-Florida State University, Tallahassee, FL 32304
2 3
Abstract: Mn-Ga alloys have shown promising hard magnetic properties, even though these alloys contain no rare-earth metals. However, much work is needed before Mn-Ga alloys become viable permanent magnets for applications. One of the challenges is to enhance the remanence. One technique to improve this property is applying a magnetic field during the heat treatment process. Magnetic annealing can promote phase transformation of the phases with high magnetic moment. This results in an increased remanence. Bulk samples of Mn-Ga alloys were made by mechanically alloying in order to create a nanostructured composite, followed by heat treatments in the presence of a 31 T magnetic field. The heat treatment temperatures were kept low in order to keep the refined microstructure. All the alloys exhibit hard magnetic properties at room temperature with large coercivity. This work reports findings of magnetic field annealed Mn-Ga bulk that 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 highest coercivity reported in bulk Mn-Ga samples. INTRODUCTION Magnets have provided the backbone of many important products ranging from computers, to electric cars, and even wind-powered generators [1]. The novel class of rare-earth magnets containing neodymium has propelled permanent magnet research to its current plateau. Magnetic properties exceeding all previous values have been realized in Nd2Fe14B magnets [2],[3]. However, producers of rare-earth minerals will likely exercise tighter restrictions on rare earth ore exports and institute strict curbs on rare earth mines in order to control the reserves of rare earths for domestic economic priorities and to c
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