Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session R41: Spin Dynamics II
8:00 AM–11:00 AM,
Thursday, March 7, 2019
BCEC
Room: 209
Sponsoring
Units:
GMAG DMP
Chair: Victor Brar, University of Wisconsin-Madison
Abstract: R41.00007 : Magnetic Vortex as a Spin Wave Filter
(Author Not Attending)
Presenter:
Danilo Froes Batista
(Brazilian Center for Research in Physics (CBPF))
Authors:
Danilo Froes Batista
(Brazilian Center for Research in Physics (CBPF))
Joao Paulo Sinnecker
(Brazilian Center for Research in Physics (CBPF))
In the Landau state, the Néel wall is divided into two regions of opposite magnetization, separated by a vortex. In this work, we show, through micromagnetic simulations, that excitations performed at one region are mostly reflected by the vortex, but they can be transmitted at specific frequencies.
The frequency of the maximum transmitted wave (FTW) can be tuned by changing the uniaxial or shape anisotropy of the system. Considering a (4x1) μm2 permalloy rectangle, the FTW has a quadratic behavior with the uniaxial anisotropy energy of the system, passing through a minimum of 500 MHz at 100 kJ/m3.
By fixing the aspect ratio of the rectangle, if the area is increased, the FTW decreases exponentially. E.g., for a fixed 4 μm length, the FTW can be tuned between 800 MHz and 2 GHz by varying the width.
Therefore, the vortex acts a tunable frequency filter for the channeled spin-waves.
1 - Garcia-Sanchez, et al. (2015) Narrow Magnonic Waveguides Based on Domain Walls
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