Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Caloric effects in ferromagnetic materials
MA 35.8: Vortrag
Mittwoch, 3. April 2019, 16:45–17:00, H52
Investigation of microstructure and magnetocaloric properties of Ni-Co-Mn-Ti Heusler alloys — •Andreas Taubel, Benedikt Beckmann, Lukas Pfeuffer, Franziska Scheibel, Maximilian Fries, Tino Gottschall, Konstantin P. Skokov, and Oliver Gutfleisch — TU Darmstadt, Alarich-Weiss-Straße 16, 64287 Darmstadt
Ni-Mn-X(-Co) Heusler alloys show a martensitic transformation that can be coupled to a magnetic phase change resulting in promising properties for magnetocaloric applications [1,2]. Recently, the principle of all-d metal Heusler alloys has been introduced by placing d-metal elements on the X site for those alloys. Especially the systems with X=Ti have been studied as promising materials due to a large magnetization change, good tunability of the phase transition and enhanced mechanical properties.
In this work, we report on the microstructural properties of Ni-rich Ni50−xCoxMn50−yTiy and Mn-rich Mn50Ni50−x−yCoxTiy alloys. By optimizing the processing route of the novel Ni-Mn-Ti system, we could improve the inverse magnetostructural phase transition in terms of sharpness and magnetization change. A large isothermal entropy change of up to 38 Jkg−1K−1 has been measured for a magnetic field change of 2T by isofield protocol.
This work was supported by DFG (Grant No. SPP1599) and ERC (Advanced Grant "cool innov").
[1] A. Taubel et al., physica status solidi (b) 255 (2), 1700331 (2018)
[2] T Gottschall et al., Nature materials 17 (10), 929 (2018)