Volume 128, Number 1, October 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 November 2019|
Scattering of exchange spin waves from regions of modulated magnetization
1 Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México Mexico City 04510, Mexico
2 Instituto de Física, Universidad Nacional Autónoma de México, IFUNAM - Mexico City 04510, Mexico
Received: 2 May 2019
Accepted: 15 October 2019
We investigate the reflection coefficient of spin waves propagating in an ultra-thin ferromagnetic film with regions where saturation magnetization is modulated. We find analytically and using micromagnetic simulations that there are transmission resonances that depend on the width of the regions and on the energy of excitation. Our results resemble the quantum-mechanical Ramsauer-Townsend effect in which an electron with certain energies can propagate above a potential field without scattering. Our findings are useful for reconfigurable magnonic devices where the saturation magnetization can be dynamically controlled via a thermal landscape.
PACS: 75.30.Ds – Spin waves / 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.78.Cd – Micromagnetic simulations
© EPLA, 2019
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