• Open Access

Magnetization switching in the inertial regime

Kumar Neeraj, Matteo Pancaldi, Valentino Scalera, Salvatore Perna, Massimiliano d'Aquino, Claudio Serpico, and Stefano Bonetti
Phys. Rev. B 105, 054415 – Published 16 February 2022

Abstract

We have numerically solved the Landau-Lifshitz-Gilbert (LLG) equation in its standard and inertial forms to study the magnetization switching dynamics in a 3d thin film ferromagnet. The dynamics is triggered by ultrashort magnetic field pulses of varying width and amplitude in the picosecond and Tesla range. We have compared the solutions of the two equations in terms of switching characteristic, speed, and energy analysis. Both equations return qualitatively similar switching dynamics, characterized by regions of slower precessional behavior and faster ballistic motion. In the case of inertial dynamics, ballistic switching is found in a 25% wider region in the parameter space given by the magnetic field amplitude and width. The energy analysis of the dynamics is qualitatively different for the standard and inertial LLG equations. In the latter case, an extra energy channel, interpreted as the kinetic energy of the system, is available. Such an extra channel is responsible for a resonant energy absorption at THz frequencies, consistent with the occurrence of spin nutation.

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  • Received 20 August 2021
  • Revised 31 January 2022
  • Accepted 3 February 2022

DOI:https://doi.org/10.1103/PhysRevB.105.054415

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kumar Neeraj1, Matteo Pancaldi1,*, Valentino Scalera2, Salvatore Perna3, Massimiliano d'Aquino3, Claudio Serpico3, and Stefano Bonetti1,4,†

  • 1Department of Physics, Stockholm University, 106 91 Stockholm, Sweden
  • 2Faculty of Computer Science, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
  • 3DIETI, University of Naples Federico II, 80125 Naples, Italy
  • 4Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venezia-Mestre, Italy

  • *Present address: Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Corresponding author: stefano.bonetti@fysik.su.se

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Vol. 105, Iss. 5 — 1 February 2022

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