SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Caloric Effects in Ferromagnetic Materials

MA 42.8: Talk

Thursday, March 30, 2023, 17:00–17:15, HSZ 04

Magnetocaloric effect in (La,Ce)(Fe,Si,Mn)₁₃ with tunable, low transition temperature — •M. Straßheim^1,2, C. Salazar Mejia¹, J. Wosnitza^1,2, and T. Gottschall¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²Institut für Festkörper- und Materialphysik Technische Universität Dresden, Dresden, Germany

The La(Fe,Si)₁₃ family is a very promising group of magnetocaloric materials due to their overall good cost-benefit ratio in comparison to alloys based on scarce rare earths such as Gd or Ho. By partly substituting La with Ce and Fe with Mn, the metamagnetic transition can be tuned down to at least 40 K, while maintaining a rather sharp transition to enable a notable magnetocaloric effect. Tuning the magnetocaloric effect down to these temperatures opens up large-scale applications such as the magnetic liquefaction of hydrogen. In this work, we synthesized (La_1−zCe_z)(Fe_0.88−yMn_ySi_0.12)₁₃ with z = 0 … 0.4, y = 0 … 0.04 and determined the adiabatic temperature change in pulsed magnetic fields. For selected samples, we calculated the magnetic entropy change using isothermal magnetization measurements.