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Open AccessArticle

Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds

1
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12 16 Prague 2, Czech Republic
2
Faculty of Mechanical Engineering, Institute of Materials Science and Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
3
Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
4
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 18221 Prague 8, Czech Republic
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 703; https://doi.org/10.3390/ma13030703
Received: 6 January 2020 / Revised: 22 January 2020 / Accepted: 25 January 2020 / Published: 4 February 2020
Fe75−xMn25Gax Heusler-like compounds were investigated in a wide range of Fe/Ga ratios while keeping the Mn content constant and equal 25 at% in order to elucidate the interplay between magnetic properties and composition. Materials were prepared by arc-melting from pure elements and subsequently annealed. Experimental investigations were focused on magnetization behavior in a wide temperature range from 4 to 1000 K and magnetic field up to 9 T. Optical and magneto-optical (MO) measurements were employed to shed more light on the magnetic state and electronic structure of investigated materials. Magnetization measurements indicated that in the vicinity of stoichiometry (Fe2MnGa) the compounds are ferro/ferrimagnetic, whereas the Fe-deficient compound is paramagnetic and at high Fe concentration the antiferromagnetic interaction prevails. Theoretical calculations of corresponding ordered and disordered stoichiometric compounds were carried out and compared to the experiment on the level of net magnetic moment as well as magneto-optical spectra. This comparison suggests that the Heusler crystal structure, L21, is not present even close to stoichiometry. Moreover, the comparison of density of states (DOS) for ordered and disordered structures allowed us to explain missing martensitic transformation (MT) in investigated materials. View Full-Text
Keywords: Heusler compounds; Fe-Mn-Ga; martensitic transformation; Curie point; magneto-optics; ab initio Heusler compounds; Fe-Mn-Ga; martensitic transformation; Curie point; magneto-optics; ab initio
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MDPI and ACS Style

Král, D.; Beran, L.; Zelený, M.; Zemen, J.; Antoš, R.; Hamrle, J.; Zázvorka, J.; Rameš, M.; Onderková, K.; Heczko, O.; Veis, M. Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds. Materials 2020, 13, 703. https://doi.org/10.3390/ma13030703

AMA Style

Král D, Beran L, Zelený M, Zemen J, Antoš R, Hamrle J, Zázvorka J, Rameš M, Onderková K, Heczko O, Veis M. Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds. Materials. 2020; 13(3):703. https://doi.org/10.3390/ma13030703

Chicago/Turabian Style

Král, Daniel; Beran, Lukáš; Zelený, Martin; Zemen, Jan; Antoš, Roman; Hamrle, Jaroslav; Zázvorka, Jakub; Rameš, Michal; Onderková, Kristýna; Heczko, Oleg; Veis, Martin. 2020. "Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds" Materials 13, no. 3: 703. https://doi.org/10.3390/ma13030703

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