Absorbing boundary layers for spin wave micromagnetics
Absorbing boundary layers for spin wave micromagnetics
Micromagnetic simulations are used to investigate the effects of different absorbing boundary layers (ABLs) on spin waves (SWs) reflected from the edges of a magnetic nano-structure. We define the conditions that a suitable ABL must fulfill and compare the performance of abrupt, linear, polynomial and tan hyperbolic damping profiles in the ABL. We first consider normal incidence in a permalloy stripe and propose a transmission line model to quantify reflections and calculate the loss introduced into the stripe due to the ABL. We find that a parabolic damping profile absorbs the SW energy efficiently and has a low reflection coefficient, thus performing much better than the commonly used abrupt damping profile. We then investigated SWs that are obliquely incident at View the MathML source26.6°,45° and 63.4°63.4° on the edge of a yttrium-iron-garnet film. The parabolic damping profile again performs efficiently by showing a high SW energy transfer to the ABL and a low reflected SW amplitude.
Magnetization dynamics, micromagnetic simulations, magnonics, spin waves
34-39
Venkat, G.
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Fangohr, H.
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Prabhakar, A.
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Venkat, G.
aa1ec1dc-cca0-4e49-9ec8-5b2f80834d95
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Prabhakar, A.
dd188e7d-1e2e-4b42-8c61-e094e0678375
Venkat, G., Fangohr, H. and Prabhakar, A.
(2017)
Absorbing boundary layers for spin wave micromagnetics.
Journal of Magnetism and Magnetic Materials, 450, .
(doi:10.1016/j.jmmm.2017.06.057).
Abstract
Micromagnetic simulations are used to investigate the effects of different absorbing boundary layers (ABLs) on spin waves (SWs) reflected from the edges of a magnetic nano-structure. We define the conditions that a suitable ABL must fulfill and compare the performance of abrupt, linear, polynomial and tan hyperbolic damping profiles in the ABL. We first consider normal incidence in a permalloy stripe and propose a transmission line model to quantify reflections and calculate the loss introduced into the stripe due to the ABL. We find that a parabolic damping profile absorbs the SW energy efficiently and has a low reflection coefficient, thus performing much better than the commonly used abrupt damping profile. We then investigated SWs that are obliquely incident at View the MathML source26.6°,45° and 63.4°63.4° on the edge of a yttrium-iron-garnet film. The parabolic damping profile again performs efficiently by showing a high SW energy transfer to the ABL and a low reflected SW amplitude.
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Absorbing boundary layers for spin wave micromagnetics
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Accepted/In Press date: 8 June 2017
e-pub ahead of print date: 10 June 2017
Keywords:
Magnetization dynamics, micromagnetic simulations, magnonics, spin waves
Organisations:
Computational Engineering & Design Group
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Local EPrints ID: 411764
URI: http://eprints.soton.ac.uk/id/eprint/411764
ISSN: 0304-8853
PURE UUID: 79722b23-fbc7-4c21-b608-f839e8c6b19d
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Date deposited: 23 Jun 2017 16:31
Last modified: 16 Mar 2024 05:27
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Author:
G. Venkat
Author:
A. Prabhakar
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