Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Spin Structures and Magnetic Phase Transitions

MA 32.1: Vortrag

Mittwoch, 18. März 2015, 15:00–15:15, EB 202

Magnetic phase transition and anisotropy in Mn₃GaC — •Moritz Riebisch, Mehmet Acet, Ralf Meckenstock, Horst Zähres, and Michael Farle — Universität Duisburg-Essen, Fakultät für Physik, AG Farle

A new setup for temperature and frequency dependent magnetic resonance measurements at high magnetic fields up to 12 T was built to study the field-induced magnetic phase transition and transitional hysteresis of the antiperovskite compound Mn₃GaC. The magnetic phase transition at T_t≈165 K of a powdered sample of Mn₃GaC was studied with temperature dependent FMR at 9.2 GHz. A field-hysteresis between 160 and 145 K in the FMR measurements indicates the field-induced transition between the antiferromagnetic ground state and the ferromagnetic phase. In the ferromagnetic phase, aligned and non-aligned resonance modes are measured as a function of temperature and frequency. Frequency dependent measurements yield an estimation of the magnetocrystalline anisotropy. The value of K4 is in the order of −100kJ/m³ at T=176 K.
Financial support by DFG is acknowledged.