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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 Ni_50+xMn_50−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).