SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 34: Focus Session: Spin-Phonon Coupling

MA 34.2: Hauptvortrag

Donnerstag, 30. März 2023, 10:00–10:30, HSZ 02

Spin-phonon coupling in ordered magnets: origin and consequences — •Akashdeep Kamra — Universidad Autónoma de Madrid, Madrid, Spain

Interaction between the spin and lattice degrees of freedom in magnets underlies a broad range of phenomena from magnetic damping to the Einstein-de Haas effect. Despite its long history and high importance, an adequate understanding of spin-phonon coupling's origin and potential consequences have eluded us. In this talk, we will discuss the microscopic mechanisms and related symmetry-breaking that underlie the spin-phonon coupling thereby achieving guidance on how to engineer it. In this discussion, we will pay special attention to the rotational invariance or total angular momentum conservation and how to account for it in the simulation of coupled spin and lattice dynamics. Then, we will examine some of the direct consequences of this coupling, focusing on magnon-polaron formation in ferro and antiferromagnets as well as the Einstein-de Haas effect in magnetic nanoparticles. If time permits, we will briefly discuss future directions and challenges.

References:

[1] M. Weißenhofer et al., arXiv:2211.02382.

[2] H. T. Simensen et al., Phys. Rev. B 99, 064421 (2019).

[3] A. Kamra et al., Phys. Rev. B 91, 104409 (2015).