SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Caloric Effects in Ferromagnetic Materials

MA 42.6: Vortrag

Donnerstag, 30. März 2023, 16:30–16:45, HSZ 04

Simultaneous measurements of adiabatic temperature change and magnetization in Fe-Ni-Rh. — •Catalina Salazar-Mejia¹, Alisa M. Chirkova², Shingo Yamamoto¹, Jochen Wosnitza^1,3, and Tino Gottschall¹ — ¹High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²FH Bielefeld, University of Applied Sciences, Germany — ³Institut für Festkörper- und Materialphysik, TU Dresden, Germany

We have performed simultaneous measurements of the magnetization and the adiabatic temperature change in an Fe₄₉Ni₁Rh₅₀ alloy. The material exhibits an antiferromagnetic (AFM) to ferromagnetic (FM) transition at T_tr≈ 326 K. Specifically, we have studied the field-induced metamagnetic AFM-FM transition at temperatures well below T_tr in high pulsed magnetic fields. Due to the large magnetocaloric effect (MCE) of the material, magnetization measurements in pulsed magnetic fields are not isothermal. Recording the temperature of the sample during the measurement allows not only to characterized the MCE of the material, but to precisely determine the magnetic phase diagram.