German Physical Society (DPG), Dresden, Almanya, 19 - 24 Mart 2017
Towards an understanding of the basic mechanism of hysteresis at a first-order magneto-structural transition — •F. Scheibel1, Ö. Çakir2, T. Gottschall3, M. Ghorbani Zavareh4,5, C. Salazar Mejia4, Y. Skourski4, F. Cugini6, A. Tekgül7, O. Gutfleisch3, J. Wosnitza4, M. Solzi6, M. Farle1, and M. Acet1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany — 2Physics Department, Yildiz Technical University, 34349 Istanbul, Turkey — 3Materialwissenschaft FG Funktionale Materialien , Technische Universität Darmstadt, 64289 Darmstadt, Germany — 4Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 5Chemical Physics of Solids, Max-Planck-Institute, 01187 Dresden, Germany — 6Physics Department and CNISM, University of Parma, 43121 Parma, Italy — 7Physics Department, Akdeniz University, 07058 Antalya, Turkey
The reversibility of the adiabatic temperature change T in materials with a first-order magneto-structural transition (FOMST) is limited by the thermal hysteresis of the transition, making it a critical factor for refrigeration applications. Adiabatic magnetization and T studies with different field-change rates up to 700 T/s are performed to understand the dynamics of the FOMST for antiperovskites, Heuslers, and transition metal pnictides. In particular, the effect of long range ferromagnetic ordering on the hysteresis is investigated. Work supported by the Deutsche Forschungsgemeinschaft (SPP 1599).