Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 61: Caloric Effects
MA 61.4: Talk
Friday, March 20, 2020, 10:15–10:30, HSZ 101
Time-dependence of the martensitic transformation in Ni-Mn-In Heusler compounds — •Lukas Pfeuffer1, Tino Gottschall2, Tom Faske1, Andreas Taubel1, Franziska Scheibel1, Konstantin Skokov1, and Oliver Gutfleisch1 — 1TU Darmstadt, Institut für Materialwissenschaft, 64287 Darmstadt, Germany — 2Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Ni-Mn-In-(Co) Heusler compounds exhibit very promising magnetocaloric properties upon the first-order transition between low temperature, low magnetization martensite to high temperature, high magnetization austenite. Thereby, the phase transformation is characterized by a shear lattice distortion, which takes place via nucleation and growth. We studied the transition process of Ni-Mn-In by simultaneous adiabatic temperature change and strain measurements in pulsed magnetic fields. By different field-sweep rates, kinetical effects of the martensitic transformation were investigated. Moreover, the influence of the initial sample temperature on critical transformation field, field hysteresis and reversibility was analyzed and correlated with isofield measurements of magnetization, strain and resistivity.
The work was supported by the European Research Council (ERC) under the European Union*s Horizon 2020 research and innovation programme (grant no. 743116*project Cool Innov). We thank the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL) and the Helmholtz Association for funding via the Helmholtz-RSF Joint Research Group (Project No. HRSF-0045)