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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.11: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

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 — ²Technische Universität Dresden, Dresden, Germany

The La(Fe, Si)₁₃ family is one of the most 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 point of 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 some samples, we calculated the magnetic entropy change using isothermal magnetization measurements.