Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.54: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Zero Field ⁵⁵Mn NMR study of Ni-Mn-Ga shape memory alloys — •Maria Eleni Belesi, Christian G. F. Blum, Bernd Büchner, and Sabine Wurmehl — Leibniz Institute for Solid State and Materials Research, Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany

Ferromagnetic shape memory alloys exhibit a structural transition from the high temperature austenitic phase to the low temperature martensitic phase. The structural transition can be driven either by temperature or by a magnetic field. Nuclear Magnetic resonance (NMR) is a powerful local technique which is well known to provide information on the static and dynamic phenomena accompanying structural phase transitions. We have performed ⁵⁵Mn NMR experiments at zero magnetic field on as-cast and annealed Ni-Mn-Ga samples prepared by arc melting. The evolution of the local structure from the high temperature austenitic phase to the low temperature martensitic phase is probed ⁵⁵Mn NMR lineshape measurements.