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

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,...

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Bibliographic Details
Published in:Journal of applied physics 2017-03, Vol.121 (10)
Main 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., Stamps, R. L.
Format: Article
Language:English
Subjects:
Comparative studies
Dependence
Islands
Light scattering
Magnetic fields
Magnetic films
Magnetic properties
Magnetization reversal
Magnons
Spin ice
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4978315