Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Spin dynamics, loop formation and cooperative reversal in artificial quasicrystals with tailored exchange coupling
 
research article

Spin dynamics, loop formation and cooperative reversal in artificial quasicrystals with tailored exchange coupling

Bhat, Vinayak Shantaram  
•
Watanabe, Sho  
•
Kronast, Florian
Show more
2023
Communications Physics

Aperiodicity and un-conventional rotational symmetries allow quasicrystalline structures to exhibit unusual physical and functional properties. In magnetism, artificial ferromagnetic quasicrystals exhibited knee anomalies suggesting reprogrammable magnetic properties via non-stochastic switching. However, the decisive roles of short-range exchange and long-range dipolar interactions have not yet been clarified for optimized reconfigurable functionality. We report broadband spin-wave spectroscopy and X-ray photoemission electron microscopy on different quasicrystal lattices consisting of ferromagnetic Ni81Fe19 nanobars arranged on aperiodic Penrose and Ammann tilings with different exchange and dipolar interactions. We imaged the magnetic states of partially reversed quasicrystals and analyzed their configurations in terms of the charge model, geometrical frustration and the formation of flux-closure loops. Only the exchange-coupled lattices are found to show aperiodicity-specific collective phenomena and non-stochastic switching. Both, exchange and dipolarly coupled quasicrystals show magnonic excitations with narrow linewidths in minor loop measurements. Thereby reconfigurable functionalities in spintronics and magnonics become realistic.

  • Files
  • Details
  • Metrics
Type
research article
DOI
10.1038/s42005-023-01310-0
Author(s)
Bhat, Vinayak Shantaram  
Watanabe, Sho  
Kronast, Florian
Baumgaertl, Korbinian
Grundler, Dirk  
Date Issued

2023

Published in
Communications Physics
Volume

6

Issue

1

Start page

193

Subjects

quasicrystal

•

ferromagnet

•

artificial spin ice

•

frustration

•

microwaves

•

magnonics

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMGN  
FunderGrant Number

FNS

163016

RelationURL/DOI

IsSupplementedBy

https://doi.org/10.5281/zenodo.8109424
Available on Infoscience
July 30, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/199396
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés