SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Ultrafast Magnetization Effects II
MA 46.3: Vortrag
Freitag, 31. März 2023, 10:00–10:15, HSZ 02
Inertial spin dynamics in ferromagnets and antiferromagnets — Ritwik Mondal1, Lucas Winter2, Sebastian Großenbach2, Ulrich Nowak2, and •Levente Rózsa2,3 — 1Indian Institute of Technology (ISM) Dhanbad, Dhanbad, India — 2University of Konstanz, Konstanz, Germany — 3Wigner Research Centre for Physics, Budapest, Hungary
Inertial spin dynamics emerges in magnetic materials at very short time scales where the directions of the atomic magnetic moment and angular momentum become separated, and nutation can be observed. The inertia gives rise to additional high-frequency or nutational excitations recently detected in ferromagnetic resonance experiments [1].
Here the signatures of inertial spin dynamics are discussed theoretically in ferromagnets (FMs) and antiferromagnets (AFMs). The nutational spin-wave bands are shifted by a constant frequency compared to the low-frequency bands in FMs, while in AFMs the nutational bands have a maximum in the center of the Brillouin zone [2]. It is demonstrated that a resonant excitation of the nutation may be utilised for switching the order parameter [3]. The switching is found to proceed faster in AFMs than in FMs, and in AFMs tuning the excitation frequency can be used to control the direction of the switching.
[1] K. Neeraj et al., Nat. Phys. 17, 245 (2021).
[2] R. Mondal et al., Phys. Rev. B 106, 134422 (2022).
[3] L. Winter et al., arXiv:2207.08566.