Nutation Resonance in Ferromagnets
Mikhail Cherkasskii, Michael Farle, and Anna Semisalova
TL;DR
This paper presents a theoretical study of inertial magnetization dynamics in ferromagnets, revealing ferromagnetic and nutation resonances with analytical expressions for their frequencies and linewidths, and analyzing how damping affects nutation linewidth.
Contribution
It provides the first analytical expressions for nutation resonance frequency and linewidth in ferromagnets based on the inertial Landau-Lifshitz-Gilbert equation.
Findings
Nutation resonance exhibits a linewidth dependence with a minimum influenced by magnetic field.
Analytical formulas for resonance frequency and linewidth are derived.
Nutation resonance peaks are identified in the magnetic response to microwave excitation.
Abstract
The inertial dynamics of magnetization in a ferromagnet is investigated theoretically. The analytically derived dynamic response upon microwave excitation shows two peaks: ferromagnetic and nutation resonances. The exact analytical expressions of frequency and linewidth of the magnetic nutation resonance are deduced from the frequency dependent susceptibility determined by the inertial Landau-Lifshitz-Gilbert equation. The study shows that the dependence of nutation linewidth on the Gilbert precession damping has a minimum, which becomes more expressive with increase of the applied magnetic field.
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