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Nutation Spectroscopy of a Nanomagnet Driven into Deeply Nonlinear Ferromagnetic Resonance

Authors :
Li, Y.
Naletov, V. V.
Klein, Oliver
Prieto, J. L.
Muñoz Sánchez, Manuel
Cros, Vicent
Bortolotti, Paolo
Anane, Abdelmadjid
Serpico, C.
Loubens, G. de
Agence Nationale de la Recherche (France)
Kazan Federal University
Université Paris-Saclay
Service de physique de l'état condensé (SPEC - UMR3680)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Kazan Federal University (KFU)
SPINtronique et TEchnologie des Composants (SPINTEC)
Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG)
Direction de Recherche Fondamentale (CEA) (DRF (CEA))
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA))
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Universidad Politécnica de Madrid (UPM)
Instituto de Microelectronica de Madrid (IMM)
Centro Nacional de Microelectronica [Spain] (CNM)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)
Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES)
THALES [France]-Centre National de la Recherche Scientifique (CNRS)
University of Naples Federico II = Università degli studi di Napoli Federico II
ANR-18-CE24-0021,MAESTRO,Excitation de magnons dans le régime fortement hors d'équilibre(2018)
Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Centro Nacional de Microelectronica [Spain] (CNM)
THALES-Centre National de la Recherche Scientifique (CNRS)
University of Naples Federico II
Li, Y.
Naletov, V. V.
Klein, O.
Prieto, J. L.
Munoz, M.
Cros, V.
Bortolotti, P.
Anane, A.
Serpico, C.
De Loubens, G.
Source :
Digital.CSIC. Repositorio Institucional del CSIC, instname, Physical Review X, Physical Review X, 2019, 9, pp.041036. ⟨10.1103/PhysRevX.9.041036⟩, Physical Review X, Vol 9, Iss 4, p 041036 (2019), Physical Review X, American Physical Society, 2019, 9, pp.041036. ⟨10.1103/PhysRevX.9.041036⟩
Publication Year :
2019
Publisher :
American Physical Society, 2019.

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 ferromagnetic resonance driven by microwave magnetic fields can occur with substantial spatial coherency at an 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. When the obtained deeply nonlinear ferromagnetic resonance regime is perturbed, the magnetization undergoes eigenoscillations around the steady state due to torques tending to restore the stable large-angle periodic trajectory. These eigenoscillations are substantially different from the usual spin-wave modes around the ground state because their existence is connected to the presence of a large coherent precession. They are experimentally investigated by a new spectroscopic technique based on the application of a second microwave excitation field that is tuned to resonantly drive them. This two-tone spectroscopy enables us to show that they consist in slow coherent magnetization nutations around the large-angle steady precession, whose frequencies are set by the balance of restoring torques. Our experimental findings are well accounted for by an analytical model derived for systems with uniaxial symmetry. They also provide a new means for controlling highly nonlinear magnetization dynamics in nanostructures, opening interesting applicative opportunities in the context of magnetic nanotechnologies.<br />Y. L. thanks the French National Research Agency for funding under Contract No. ANR-14-CE26- 0021 (MEMOS), V. V. N. acknowledges the Russian Competitive Growth program of Kazan Federal University, and C. S. acknowledges the Labex NanoSaclay (ANR-10-LABX-0035) for support under the action “Rayonnement International.” This research was partially funded by the ANR-18-CE24-0021 (MAESTRO) project.

Details

ISSN :
21603308
Database :
OpenAIRE
Journal :
Digital.CSIC. Repositorio Institucional del CSIC, instname, Physical Review X, Physical Review X, 2019, 9, pp.041036. ⟨10.1103/PhysRevX.9.041036⟩, Physical Review X, Vol 9, Iss 4, p 041036 (2019), Physical Review X, American Physical Society, 2019, 9, pp.041036. ⟨10.1103/PhysRevX.9.041036⟩
Accession number :
edsair.doi.dedup.....5b9474fb9f921f6047737738b7d235e3
Full Text :
https://doi.org/10.1103/PhysRevX.9.041036⟩