Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background
VIDEO DOI: https://doi.org/10.48448/v0yd-rt11

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Annealing a skyrmion lattice with spin wave excitations

Skyrmion lattices are present in many different chiral magnetic systems and their existence derives from a number of competing interactions. In a recent work 1, we showed that Pt/FeCoB/Al2O3 multilayers can host skyrmion lattices over a range of applied perpendicular fields. A particular feature of this material system is the presence of a "high-frequency" mode (HFM) under transverse field pumping, in the range of 12-18 GHz, which involves the coherent precession of the skyrmion cores and results in the generation of spin waves that flow into the uniform background region between skyrmions. Here, we discuss the results of micromagnetics simulations with the MuMax3 code 2 where we examine the role of spin wave interactions with the skyrmion cores. As the applied field increases and skyrmions begin to annihilate, leaving vacancies in the hexagonal lattice, the excitation of the HFM can serve to "anneal" the lattice, resulting in a glassy state as shown in the Figure. The spin wave interactions are found to provide a dynamical repulsive force between the skyrmion cores, which result in a more homogeneous arrangement in terms of density, but at the expense of crystalline order. These results also shed new light on how dynamical excitations can influence phase transitions associated with the melting of skyrmion lattices 3.

References
1 T. Srivastava et al, arXiv:2111.11797 (2021). 2 A. Vansteenkiste et al, AIP Advances, vol. 4, 107133 (2014). 3 P. Huang et al, Nat. Nanotechnol., vol. 15, 761 (2020).


Simulated MFM images of skyrmion lattices under different applied fields, before and after the excitation of a high-frequency mode (HFM) that generates spin waves. The insets show discrete Fourier transforms of the spatial order.

Downloads

Transcript English (automatic)

Next from MMM 2022

Magnonic dispersion of Er2O3
technical paper

Magnonic dispersion of Er2O3

MMM 2022

Mehdi Maleki Sanukesh and 1 other author

07 November 2022

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)

PRESENTATIONS

  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved