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Absorbing boundary layers for spin wave micromagnetics

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journal contribution
posted on 26.03.2019, 09:19 by Guru Venkat, H. Fangohr, A. Prabhakar
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 condi-tions that a suitable ABL must fulfill and compare the performance of abrupt, linear, polynomial and tanhyperbolic damping profiles in the ABL. We first consider normal incidence in a permalloy stripe and pro-pose a transmission line model to quantify reflections and calculate the loss introduced into the stripedue to the ABL. We find that a parabolic damping profile absorbs the SW energy efficiently and has alow reflection coefficient, thus performing much better than the commonly used abrupt damping profile.We then investigated SWs that are obliquely incident at 26.6; 45 and 63.4 on the edge of a yttrium-iron-garnet film. The parabolic damping profile again performs efficiently by showing a high SW energytransfer to the ABL and a low reflected SW amplitude.

Funding

This work was supported in part by the Department of Science and Technology, Government of India sanction number SB/S3/EECE/011/2014 (IITM).

History

School

  • Science

Department

  • Physics

Published in

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Volume

450

Pages

34 - 39

Citation

VENKAT, G., FANGOHR, H. and PRABHAKAR, A., 2018. Absorbing boundary layers for spin wave micromagnetics. Journal of Magnetism and Magnetic Materials, 450, pp.34-39.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This paper was published in the journal Journal of Magnetism and Magnetic Materials and the definitive published version is available at https://doi.org/10.1016/j.jmmm.2017.06.057.

ISSN

0304-8853

Language

en