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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.21: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Nutation resonance in antiferromagnets — •Ritwik Mondal1,2, Levente Rózsa3, Sebastian Grossenbach3, and Ulrich Nowak3 — 1Institute of Physics of the Czech Academy of Sciences, Prague 6, Czech Republic — 2Department of Physics and Astronomy, Uppsala University, Sweden — 3Fachbereich Physik, Universität Konstanz, DE-78457 Konstanz, Germany
At ultrafast timescales, an additional spin torque term has to be supplemented within Landau-Lifshitz-Gilbert spin dynamics, to account for magnetic inertial dynamics causing spin nutation [1]. The experimental observation of the nutation resonance has only been achieved very recently [2]. In this work, we compare the effect of spin nutation in ferromagnets, antiferromagnets and ferrimagnets using linear response theory [3]. We identify the precession and nutation resonance peaks, and demonstrate that the precession resonance frequencies are reduced by the spin nutation, while the lifetime of the excitations is enhanced. We find the interplay between precession and nutation resonances to be more prominent in antiferromagnets compared to the ferromagnets, where the timescale of the exchange-driven sublattice dynamics is comparable to inertial relaxation times. Consequently, antiferromagnetic resonance techniques should be better suited for the search for intrinsic inertial spin dynamics on ultrafast timescales than ferromagnetic resonance [3].
[1] M.-C. Ciornei, J. M. Rubí, and J.-E. Wegrowe, Phys. Rev. B 83, 020410(R) (2011)
[2] K. Neeraj et al., Nature Phys. 17, 245 (2021)
[3] R. Mondal et al. Phys. Rev. B 103, 104404 (2021)