SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.31: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Shell-ferromagnetism: a revised model — •Nicolas Josten1, Sakia Noorzayee1, Mehmet Acet1, Franziska Scheibel2, Asli Çakir3, and Michael Farle1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University Duisburg Essen, Duisburg, 47057, Germany — 2Institute of Material Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 16, 64287 Darmstadt, Germany — 3Department of Metallurgical and Materials Engineering, Mugla University, 48000 Mugla, Turkey
Shell-ferromagnetism denotes a strong pinning of magnetic moments in off-stoichometric Ni50Mn45X05 (X= Al, Ga, In, Sn, Sb) Heusler alloys after decomposition into full Heusler Ni2MnX and antiferromagnetic Ni50Mn50 above 550K [1]. The pinning is induced through magnetic annealing during decomposition resulting in coercive fields larger than 6 Tesla. The origin of this effect has been identified as ordering of excess Ni in the Mn-sublattice of the binary alloy Ni50+xMn50−x [2]. While the magnetic and thermal stability of the induced unidirectional anisotropy is already extremely high, maximizing the pinned magnetization is key for any technological application.
Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 405553726 - TRR 270.
[1] A. Cakir et al., Sci. Rep.6, 28931 (2016) [2] L. Pál et al., Phys. Stat. Sol. 42, 49-59 (1970).