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Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 1: Magnetic nanoparticles (joint session MA/CPP)

MA 1.10: Talk

Monday, March 12, 2018, 12:00–12:15, H 0112

Magnetic properties of shell-ferromagnetic precipitates in decomposed off-stoichiometric Ni-Mn-based Heusler alloys, studied by ferromagnetic resonance (FMR) — •F. Scheibel1,3, D. Spoddig1, R. Meckenstock1, T. Gottschall2,3, M. Fries3, A. Çakir4, M. Farle1, O. Gutfleisch3, and M. Acet11Faculty of Physics and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany — 2High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 3Institut für Materialwissenschaft FG Funktionale Materialien, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 4Department of Metallurgical and Materials Engineering, Muğla Sitki Koçman University, 48000 Muģla, Turkey

Off-stoichiometric Ni50Mn25−yXy (25>y>0) Heusler alloys decompose into ferromagnetic (FM) Ni50Mn25X25 and antiferromagnetic Ni50Mn50 components when annealed between 600 and 750 K [1]. In the case of y=5 annealed at 650 K, shell-ferromagnetic Ni50Mn25X25 nano-precipitates of about 3 nm are formed. High-field FMR measurements up to 12 T verify the existence of a strong coupling of the shell of the precipitates with the surrounding Ni50Mn50 matrix [2]. Magnetization measurements show a rotation of the shell-spins first above 5 T, while the core shows a soft FM behavior. The magnetic hysteresis is vertically shifted, which makes this material interesting for magnetic-field proof permanent memory application. Work supported by the Deutsche Forschungsgemeinschaft (SPP 1599).
A. Çakir et al., Sci. Rep. 6 , 28931 (2016)
F. Scheibel et al., AIP Adv. 7, 056425 (2017)

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