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Chiral excitations of magnetic droplet solitons driven by their own inertia

Morteza Mohseni, D. R. Rodrigues, M. Saghafi, S. Chung, M. Ahlberg, H. F. Yazdi, Q. Wang, S. A. H. Banuazizi, P. Pirro, J. Åkerman, and Majid Mohseni
Phys. Rev. B 101, 020417(R) – Published 28 January 2020
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Abstract

The inertial effects of magnetic solitons play a crucial role in their dynamics and stability. Yet governing their inertial effects is a challenge for their use in real devices. Here, we show how to control the inertial effects of magnetic droplet solitons. Magnetic droplets are more strongly nonlinear and localized autosolitons than can form in current-driven nanocontacts. Droplets can be considered as dynamical particles with an effective mass. We show that the dynamical droplet bears a second excitation under its own inertia. These excitations comprise a chiral profile, and appear when the droplet resists the force induced by the Oersted field of the current injected into the nanocontact. We reveal the role of the spin torque on the excitation of these chiral modes and we show how to control these modes using the current and the field.

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  • Received 17 June 2019
  • Revised 3 October 2019

DOI:https://doi.org/10.1103/PhysRevB.101.020417

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Morteza Mohseni1,*, D. R. Rodrigues2, M. Saghafi1, S. Chung3, M. Ahlberg4, H. F. Yazdi1, Q. Wang5, S. A. H. Banuazizi6, P. Pirro5, J. Åkerman4,6, and Majid Mohseni1,†

  • 1Department of Physics, Shahid Beheshti University, Evin, Tehran 19839, Iran
  • 2Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
  • 3Department of Physics Education, Korea National University of Education, Cheongju 28173, South Korea
  • 4Department of Physics, University of Gothenburg, Fysikgränd 3, 412 96 Gothenburg, Sweden
  • 5Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
  • 6Materials and Nano Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Electrum 229, 164 40 Kista, Sweden

  • *Present address: Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
  • Corresponding author: m-mohseni@sbu.ac.ir

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Issue

Vol. 101, Iss. 2 — 1 January 2020

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