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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.9: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Strain Tuning of the Altermagnetic Candidate MnF₂ — •Rahel Ohlendorf^1,2, Hilary M. L. Noad¹, Elena Hassinger², Andrew P. Mackenzie^1,3, and Elena Gati¹ — ¹Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany — ²Technical University, Dresden, Germany — ³University of St Andrews, UK

Altermagnetism is a newly defined collinear magnetic phase unambiguously differentiated from the already known ferro- and antiferromagnetic phases within the framework of spin group symmetry [1]. This magnetic phase combines the highly sought after properties of compensated spin order in real space and spin-split bands in reciprocal space even without spin-orbit coupling, relevant for spintronic applications. Similar to the magnetic field for ferromagnets, the combination of strain and magnetic field is predicted to act as a conjugate field to the altermagnetic order parameter. Consequently, strain and magnetic field might be used to (i) probe the altermagnetic susceptibility, related to octupolar degrees of freedom in centrosymmetric systems and (ii) create a single-domain altermagnetic state exploiting the piezomagnetic effect [2,3]. We discuss the results of elastocaloric and stress-strain measurements of the altermagnetic centrosymmetric candidate MnF₂ under finite strain and magnetic field.

[1]L. Smejkal et al., Phys. Rev. X 12, 031042 (2022)

[2]S. Bhowal et al., ArXiv: 2212.03756v1 (2022)

[3]L. Ye et al., ArXiv: 2309.04633v1 (2023)

*Work is supported by the DFG through TRR288 (Elasto-Q-Mat).

Keywords: Altermagnets; Strain; MnF2; Elastocalorics; Octupolar Order