Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Magnetic Heuslers
MA 42.4: Talk
Friday, September 9, 2022, 12:15–12:30, H48
Tuning of the effective magnetic decoupling in Ni-Mn-(In,Sn) Heusler alloys — •Olga N. Miroshkina1, Francesco Cugini2,3, Simone Chicco2, Fabio Orlandi4, Giuseppe Allodi2, Pietro Bonfà2, Vincenzo Vezzoni2, Lara Righi2,3, Franca Albertini3, Roberto De Renzi2, Massimo Solzi2,3, and Markus E. Gruner1 — 1Department of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2University of Parma, Parma, Italy — 3IMEM-CNR, Parma, Italy — 4Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, United Kingdom
The magnetocaloric effect at first-order phase transitions is considered as an efficient and ecologically friendly alternative to conventional compressor cooling. This contribution is devoted to the complex magnetic ordering mechanisms in magnetocaloric Ni-Mn-(In,Sn) Heusler alloys, which we explore by means of density functional theory. The calculations accompany extensive experimental investigations, which reveal a non-monotonic trend in the Curie temperature and an effective magnetic decoupling of 4a and 4b sublattices [1]. Our first-principles calculations confirm a composition-dependent competition of the effective ferromagnetic and antiferromagnetic coupling between the sublattices, which can be directly controlled by electron doping in terms of In/Sn substitution. This result shows the possibility of fine-tuning of Heusler materials via exchanging the main-group element increasing the range of their potential applications. This work is funded by DFG within CRC/TRR 270 (project no. 405553726).
[1] F. Cugini et al., Phys. Rev. B 105, 174434 (2022).