Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 10: INNOMAG e.V. Prizes 2026 (Diplom-/Master and Ph.D. Thesis)

MA 10.3: Invited Talk

Monday, March 9, 2026, 15:55–16:20, POT/0112

Exploring magneto- and multicaloric materials for room and cryogenic temperature applications — •Benedikt Beckmann — Institute of Materials Science, Technical University of Darmstadt, Darmstadt, Germany

A sustainable future requires energy-efficient and environmentally friendly cooling technologies. This thesis investigates Ni(-Co)-Mn-Ti Heusler alloys [1,2,3], Fe2AlB2-type MAB phases [4], La(Fe,Si)13-type compounds [5], and Co4(OH)6(SO4)2[enH2] [6] for magneto- and multicaloric cooling at room and cryogenic temperatures. At room temperature, optimized Ni(-Co)-Mn-Ti Heusler alloys show large isothermal entropy and adiabatic temperature changes but are limited by hysteresis [1,2], motivating the work on hysteresis-free, low-cost MAB phases [4]. At cryogenic temperatures, universal hysteresis limitations of first-order phase transition materials are revealed for caloric hydrogen liquefaction [3,5], driving follow-up studies [7]. Following these discoveries, the novel second-order material Co4(OH)6(SO4)2[enH2] shows record performance among rare-earth-free materials [6], highlighting the potential of transition-metal-based hydrogen liquefaction.

[1] A. Taubel, B. Beckmann et al., Acta Mater. 201 (2021), [2] B. Beckmann et al., Acta Mater. 282 (2025), [3] B. Beckmann et al., Acta Mater. 246 (2023), [4] B. Beckmann et al., J. Appl. Phys. 133 (2023), [5] B. Beckmann et al., ACS Appl. Mater. Interfaces 16, (2024), [6] J.J.B. Levinsky, B. Beckmann et al., Nat. Commun. 15 (2024), [7] T. Niehoff, B. Beckmann et al., Adv. Funct. Mater. 2505704 (2025)

Keywords: Magnetocaloric; Multicaloric; Caloric Cooling; Hydrogen Liquefaction