Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 29: Caloric Effects in Magnetic Materials
MA 29.7: Talk
Thursday, September 8, 2022, 11:00–11:15, H47
Multicaloric all-d-metal Ni-Co-Mn-Ti Heusler alloys: Heat treatment optimization and arrested martensitic transformations — •Benedikt Beckmann1, Andreas Taubel1, Lukas Pfeuffer1, David Koch1, Tino Gottschall2, Franziska Scheibel1, Konstantin P. Skokov1, and Oliver Gutfleisch1 — 1TU Darmstadt, Institute of Material Science, 64287 Darmstadt, Germany — 2Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
Ni-Mn-based Heusler alloys display precisely tunable first-order martensitic transformations and are promising candidates for multicaloric cooling applications [1]. In our work, all-d-metal Ni50-xCoxMn50-yTiy Heusler alloys, showing an enhanced mechanical stability, are analyzed in detail [2]. A systematic heat treatment optimization results in a tailored microstructure and leads to large isothermal entropy changes up to 38 J(kgK)-1 and adiabatic temperature changes up to -3.8 K for the first field application in moderate magnetic field changes of 2 T. The contradictory role of the magnetic entropy contribution [3], which leads to arrested martensitic transformations in Ni50-xCoxMn50-yTiy inverse magnetocaloric Heusler alloys, is discussed in detail.
We acknowledge financial support from DFG (CRC/TRR 270) and ERC (Adv. Grant No. 743116).
[1] T. Gottschall et al., Nat. Mater. 17, 929-934 (2018)
[2] A. Taubel et al., Acta Mater. 201, 425-434 (2021)
[3] T. Gottschall et al., Phys. Rev. B 93, 184431 (2016)