Nutation spectroscopy of a nanomagnet driven into deeply nonlinear ferromagnetic resonance

Abstract : Strongly out-of-equilibrium regimes in magnetic nanostructures exhibit novel properties, linked to the nonlinear nature of magnetization dynamics, which are of great fundamental and practical interest. Here, we demonstrate that field-driven ferromagnetic resonance can occur with substantial spatial coherency at unprecedented large angle of magnetization precessions, which is normally prevented by the onset of spin-wave instabilities and magnetization turbulent dynamics. Our results show that this limitation can be overcome in nanomagnets, where the geometric confinement drastically reduces the density of spin-wave modes. The obtained deeply nonlinear ferromagnetic resonance regime is probed by a new spectroscopic technique based on the application of a second excitation field. This enables to resonantly drive slow coherent magnetization nutations around the large angle periodic trajectory. Our experimental findings are well accounted for by an analytical model derived for systems with uniaxial symmetry. They also provide new means for controlling highly nonlinear magnetization dynamics in nanostructures, which open interesting applicative opportunities in the context of magnetic nanotechnologies.
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https://hal.archives-ouvertes.fr/hal-02063416
Contributor : Grégoire de Loubens <>
Submitted on : Tuesday, March 12, 2019 - 5:34:16 PM
Last modification on : Thursday, April 4, 2019 - 9:44:03 AM

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  • HAL Id : hal-02063416, version 1
  • ARXIV : 1903.05411

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Yi Li, Vladimir V. Naletov, Olivier Klein, José Luis Prieto, Manuel Muñoz, et al.. Nutation spectroscopy of a nanomagnet driven into deeply nonlinear ferromagnetic resonance. 2019. ⟨hal-02063416⟩

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