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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.47: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

Magnetic Phases in Ni-Mn Heusler Alloys: A Case for Ab-initio Plus Structure Factor Calculations — •Marianne Schröter, Jan Büddefeld, Maurice Thomalzig, Alfred Hucht, and Anna Grünebohm — Universität Duisburg-Essen, Germany

Ni-Mn based magnetic Heusler alloys, which are among the candidates for environmentally friendly solid state cooling, show rich magnetic phase diagrams.[1] Competing ferromagnetic and anti-ferromagnetic interactions generate complicated spin structures, including different kinds of ferrimagnetic and helimagnetic ordering. To analyse these structures we augment the multi-step approach [2] (DFT and classical Heisenberg model with long-range magnetic interactions parametrized by DFT) by evaluating the magnetic structure factor.

We present temperature and concentration dependent magnetic phase diagrams for Ni(Co)Mn(Ga, Sn) alloys.

[1] T. Graf, et. al, Prog. Solid State Chem. 39, 1 (2011)

[2] D. Comtesse et .al., Eur. Phys. B 85, 343 (2012)