Thickness dependence of spin wave excitations in an artificial square spin ice-like geometry

Li, Y., Gubbiotti, G., Casoli, F., Morley, S.A., Gonçalves, F.J.T., Rosamond, M.c., Linfield, E.H., Marrows, C.H., McVitie, S. and Stamps, R.L. (2017) Thickness dependence of spin wave excitations in an artificial square spin ice-like geometry. Journal of Applied Physics, 121(10), 103903. (doi:10.1063/1.4978315)

[img]
Preview
Text
137485.pdf - Published Version
Available under License Creative Commons Attribution.

1MB

Abstract

We present a comparative study of the spin wave properties in two magnetic films patterned into an artificial square spin ice-like geometry. The array elements are rectangular islands with the same lateral dimensions but with different thicknesses: 10 nm and 30 nm. Using Brillouin light scattering, the frequencies of spin wave excitations were measured as a function of the magnetic field going from positive to negative saturation. We find substantial changes with thickness to spin wave mode frequencies and the number of detected modes. Frequencies of spin waves localized at element edges are observed to evolve non-monotonically with magnetic fields and soften at critical fields. These critical fields enable us to extract information of the magnetization reversal of individual islands within the array. Finally, we discuss the effects of separation between islands and examine the possibilities for dynamic coupling through the overlap of collective edge modes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McVitie, Professor Stephen and Stamps, Professor Robert
Authors: Li, Y., Gubbiotti, G., Casoli, F., Morley, S.A., Gonçalves, F.J.T., Rosamond, M.c., Linfield, E.H., Marrows, C.H., McVitie, S., and Stamps, R.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Applied Physics
Publisher:American Institute of Physics
ISSN:0021-8979
ISSN (Online):1089-7550
Published Online:10 March 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Journal of Applied Physics 121: 103903
Publisher Policy:Reproduced under a creative commons license
Data DOI:10.5525/gla.researchdata.391

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
629961Artificial spin ice: designer matter far from equilibriumRobert StampsEngineering & Physical Sciences Research Council (EPSRC)EP/L002922/1S&E P&A - PHYSICS & ASTRONOMY