Unidirectional emission and reconfigurability of channeled spin waves from a vortex core in a teardrop-shaped nanopatch

D. Osuna Ruiz, E. L. Martin, A. P. Hibbins, and F. Y. Ogrin
Phys. Rev. B 104, 094427 – Published 21 September 2021
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Abstract

We propose the design of a teardrop-shaped magnetic patch as a unidirectional magnetically driven spin wave emitter capable of operating in a wide range of frequencies. We explore its potential through micromagnetic studies in line with vibrational sample magnetometry measurements and ferromagnetic resonance experiments. The proposed system is based on the excitation of a vortex core, acting as a source of spin waves, and a single Bloch domain wall, as a channel for the confinement and propagation of the mode in a sufficiently thick magnetic patch in the single magnetic vortex (SMV) state. The novelty consists in the reconfigurability and simplicity of the system, that is operational without the need of external saturating fields, retaining a single Bloch domain wall and a movable single vortex core. This allows significant suppression of the wave emission by means of an external bias field, which in turn allows a controllable valvelike effect. Following our proposed strategy for cultivating a single vortex core in the shape, and after a thorough micromagnetic study of the most prominent magnetization dynamics in the patch, we show that the SMV state can be obtained in a thick enough (80 nm) teardrop-shaped patch. Micromagnetic results show the potential of this simple structure as a tunable and unidirectional spin wave emitter. Experimental results also suggest that the required magnetic configuration has been experimentally obtained in the structure, in good agreement with micromagnetic simulations.

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  • Received 22 April 2021
  • Revised 4 September 2021
  • Accepted 14 September 2021

DOI:https://doi.org/10.1103/PhysRevB.104.094427

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. Osuna Ruiz1,2,*, E. L. Martin2, A. P. Hibbins2, and F. Y. Ogrin2

  • 1Department of Applied Physics, University of Salamanca, Salamanca 37008, Spain
  • 2Department of Physics and Astronomy, University of Exeter, Exeter EX4 4QL, United Kingdom

  • *d.osuna-ruiz2@exeter.ac.uk

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Issue

Vol. 104, Iss. 9 — 1 September 2021

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