Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 60: Magnetic Materials: Applications and Multielement Bulk Materials

MA 60.9: Vortrag

Freitag, 24. März 2017, 11:30–11:45, HSZ 101

The influence of the anti-phase domain structure on the magnetic properties in Ni2MnAl0.5Ga0.5 — •Pascal Neibecker1,2, Xiao Xu2, Winfried Petry1, Ryosuke Kainuma2, and Michael Leitner11Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany — 2Department of Materials Science, Tohoku University, Sendai 980-8579, Japan

The characteristic length scale of the L21 anti-phase domain (APD) structure has been observed to have a significant influence on the magnetic properties of Heusler alloys [1]. The ideal system to study this phenomenon is Ni2MnAl0.5Ga0.5 where the phase transition temperatures and diffusion kinetics allow to adjust a variety of combinations of degrees of L21 order and APD sizes. Here, we investigate the effect of the APD length scale on the magnetic properties in Ni2MnAl0.5Ga0.5 via probing the entire accessible parameter space of APD sizes and degrees of L21 order, starting from B2 order and adjusting different APD scale/ atomic order values via appropriate annealing procedures. We show that both contributions, APD size and degree of order, can clearly be distinguished in magnetization measurements and we use those measurements to follow their respective temporal evolution. In a second step, we simulate APD structures and degrees of L21 order using Monte Carlo simulations and show via magnetic simulations on the pre-set APD structures that we can reproduce all characteristic features of the experimentally observed magnetization curves.

[1] H. Ishikawa, et al., Acta Materialia 56 (2008), p. 4789-4797

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