Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 61: Caloric Effects
MA 61.2: Talk
Friday, March 20, 2020, 09:45–10:00, HSZ 101
Magnetocaloric materials for multi-stimuli cooling cycle - required functional properties and potential materials — •Franziska Scheibel1, Tino Gottschall2, Lukas Pfeuffer1, Andreas Taubel1, Dominik Ohmer1, Konstantin Skokov1, Bai-Xiang Xu1, and Oliver Gutfleisch1 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany
Materials with a first-order magnetostructural phase transition (FOMST) exhibit a large magnetocaloric effect. However, due to the thermal hysteresis coming along with FOMST the cyclic performance of that materials is limited. The origins of the hysteresis are quite complex but this complexity can also be utilized to tune it [1,2]. So far, a lot of research has been directed towards reducing the hysteresis. Our new cooling concept actually attempts to exploit hysteresis in a multi-stimuli approach [3]. Herein, a second stimulus (uniaxial load) besides the magnetic field stimulus is used to overcome hysteresis and enable a fully reversible FOMST and therefore increase the cyclic performance of the magnetocaloric material. For the multi-stimuli approach a variety of new functional properties are required and we present here a first summary of experimental and theoretical findings on tailored Ni-Mn-X Heusler alloys as potential candidates. This work was supported by the ERC Advanced Grant "Cool Innov" and the SFB-TRR270 "Hommage". [1] O. Gutfleisch et al., Phil. Trans. R. Soc. A 374: 20150308 (2016) [2] F. Scheibel et al., Energy Technol. 6, 1397 (2018) [3] T. Gottschall et al., Nat. Mater. 17, 929 (2018)