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Nutation in antiferromagnetic resonance

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Physical Review B. American Physical Society (APS). 2021, 103, 104404. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.103.104404

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The effect of inertial spin dynamics is compared between ferromagnetic, antiferromagnetic and ferrimagnetic systems. The linear response to an oscillating external magnetic field is calculated within the framework of the inertial Landau--Lifshitz--Gilbert equation using analytical theory and computer simulations. Precession and nutation resonance peaks are identified, and it is demonstrated that the precession frequencies are reduced by the spin inertia, while the lifetime of the excitations is enhanced. The interplay between precession and nutation is found to be the most prominent in antiferromagnets, 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 intrinsical inertial spin dynamics on ultrafast timescales than ferromagnetic resonance.

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ISO 690MONDAL, Ritwik, Sebastian GROSSENBACH, Levente RÓZSA, Ulrich NOWAK, 2021. Nutation in antiferromagnetic resonance. In: Physical Review B. American Physical Society (APS). 2021, 103, 104404. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.103.104404
BibTex
@article{Mondal2021Nutat-53379,
  year={2021},
  doi={10.1103/PhysRevB.103.104404},
  title={Nutation in antiferromagnetic resonance},
  volume={103},
  issn={2469-9950},
  journal={Physical Review B},
  author={Mondal, Ritwik and Großenbach, Sebastian and Rózsa, Levente and Nowak, Ulrich},
  note={Article Number: 104404}
}
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