Dresden 2017 – wissenschaftliches Programm
MA 68.25: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG4
Probing multi-caloric effects (magneto-, baro-, and elasto-) in all-d-metal magnetic Heusler shape memory alloys — •Enke Liu1,2, Zhiyang Wei2, Catalina Salazar Mejia3, Mahdiyeh Ghorbani-Zavareh1, Zhaosheng Wang3, Jian Liu4, Xuekui Xi2, Wenhong Wang2, Guangheng Wu2, Xixiang Zhang5, and Claudia Felser1 — 1Max-Planck Institute for Chemical Physics of Solids, Dresden, Germany. — 2Insititute of Physics, Chinese Academy of Sciences, Beijing, China. — 3Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany. — 4Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China. — 5King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
Caloric effects, driven by different external fields in phase transitions, are drawing increasing attention from solid-state cooling in very recent years. In this work, I will show the multi-caloric effects in a new family of magnetic shape memory alloys of all-d-metal Heusler Ni(Co)-Mn-Ti under different external fields of hydrostatic pressure, axial stress, and pulsed high magnetic field. A pressure driving efficiency of dTt/dp = 56 K/GPa was obtained based on the large volume change of Δω = 2 percent during the hydrostatic pressure, leading to a large Δω|dTt/dp|-1 of 0.036 percent K GPa-1. Large adiabatic temperatures of 10 K and 9 K were, respectively, observed during the axial loading and the pulsed magnetic fields. Large multi-caloric effects can be gained in the all-d-metal Heusler Ni(Co)-Mn-Ti based on the strong magnetostructural coupling.