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MA: Fachverband Magnetismus

MA 39: Magnetic Particles / Clusters

MA 39.5: Vortrag

Freitag, 9. September 2022, 10:30–10:45, H47

Towards FeRh nanoparticles for printable magnetocaloric media — •Joachim Landers¹, Soma Salamon¹, Ruksan Nadarajah², Shabbir Tahir², Benedikt Eggert¹, Bilal Gökce², and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen — ²Materials Science and Additive Manufacturing, University of Wuppertal

Magnetocaloric (MC) materials are promising candidates for energy efficient cooling applications. Here, FeRh nanoparticles prepared via laser ablation in liquids (LAL) are studied as possible means towards printable MC media. First experiments focused on how to minimize surface oxidation during nanoparticle preparation in solution. After ensuring low oxidation levels, our main interest was to find a method to regain the FeRh B2 structure and its MC properties during further processing. For that purpose, extensive studies via magnetometry, XRD and Mössbauer spectroscopy were performed to analyze magnetic structure and phase composition when exposing the particles to elevated temperatures, as would occur during laser printing of MC structures. We observed a transition from the predominant γ-FeRh-phase formed during laser particle synthesis to the B2-phase we aimed for, constituting a maximum B2-fraction of ca. 90 % of the material. Ongoing studies are currently searching for optimum processing parameters for laser-sintering of the FeRh-NP-based inks in an approach to form 2D magnetocaloric structures, with first results indicating the presence of the field-induced B2-phase antiferro- to ferromagnetic transition. This work is supported by the DFG through CRC/TRR 270.