Disordered_skyrmion_arrays_II_PRB_revision_main.pdf (21.24 MB)
Download file

Weakly pinned skyrmion liquid in a magnetic heterostructure

Download (21.24 MB)
journal contribution
posted on 21.09.2022, 14:55 authored by Rhodri Mansell, Yifan Zhou, Kassius Kohvakka, See-Chen Ying, Ken R Elder, Enzo Granato, Tapio Ala-NissilaTapio Ala-Nissila, Sebastiaan van Dijken
Magnetic skyrmions are topologically distinct particles whose thermally activated motion could be used to implement probabilistic computing paradigms. While solid-liquid phase transitions in skyrmion lattices have been demonstrated, the behavior of a skyrmion liquid and the effects of pinning are largely unknown. Here we demonstrate the formation of a weakly pinned skyrmion liquid in a magnetic heterostructure. By inserting a Ru wedge layer at the ferromagnet/heavy metal interface we evaluate the dependence of skyrmion dynamics on the skyrmion size and density. Our experiments demonstrate that the diffusion of skyrmions is largest in dense liquids with small skyrmions. The thermal motion of skyrmions at room temperature easily overcomes the narrow distribution of pinning site energies in the granular film structure, satisfying a key requirement of probabilistic device architectures. Micromagnetic simulations support the findings and also reveal the existence of a thermally activated high-frequency collective oscillation.

Funding

Designer spin interfaces through electric field control

Academy of Finland

Find out more...

Designer spin interfaces through electric field control

Academy of Finland

Find out more...

Designer spin interfaces through electric field control

Academy of Finland

Find out more...

NSF-MPS2006456

Dynamics, topological defects and phase transitions in two-dimensional systems.

São Paulo Research Foundation

Find out more...

Academy of Finland QTF CoE Grant No. 312298

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Physical Review B

Volume

106

Issue

5

Publisher

American Physical Society

Version

AM (Accepted Manuscript)

Rights holder

© American Physical Society

Publisher statement

This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/physrevb.106.054413

Acceptance date

28/06/2022

Publication date

2022-08-10

Copyright date

2022

ISSN

2469-9950

eISSN

2469-9969

Language

en

Depositor

Prof Tapio Ala-Nissila. Deposit date: 21 September 2022

Article number

054413

Usage metrics

Categories

Exports