A metamaterial description of collective modes in 2D antidot lattice (ADLs) perpendicularly magnetized has been performed. ADLs are composed of circular nanoholes of diameter d = 200 nm embedded into a CoFeB film having thickness of 41 nm. The analysis of collective modes has been carried out by means of a micromagnetic method, named Dynamical Matrix Method (DMM). The mode propagation is studied placing an external magnetic field H along the z-axis and the Bloch wave vector K is parallel to the x-axis. The aim of this study is to describe in terms of effective properties the spin dynamics in perpendicularly magnetized ADLs [1] by extending the simple rules on the effective wavelength and on the effective wave vector that were found for in-plane magnetized ADLs and their dependence on the corresponding Bloch quantities [2,3]. From the inspection of spatial profiles of collective modes it is possible to identify a characteristic wavelength which is commensurable with the periodicity a of the system. [1] P. Malagò et al., “Effective properties of perpendicularly magnetized 2D antidot lattices” in preparation [2] R. Zivieri and L. Giovannini Metamaterials 6 (2012) e126 [3] R. Zivieri and L. Giovannini Photon. Nanostruct: Fundam. Appl. 11 (2013) 191

Metamaterial description of perpendicularly magnetized 2D antidot lattices - Presentazione poster

MALAGO', Perla;GIOVANNINI, Loris;ZIVIERI, Roberto
2015

Abstract

A metamaterial description of collective modes in 2D antidot lattice (ADLs) perpendicularly magnetized has been performed. ADLs are composed of circular nanoholes of diameter d = 200 nm embedded into a CoFeB film having thickness of 41 nm. The analysis of collective modes has been carried out by means of a micromagnetic method, named Dynamical Matrix Method (DMM). The mode propagation is studied placing an external magnetic field H along the z-axis and the Bloch wave vector K is parallel to the x-axis. The aim of this study is to describe in terms of effective properties the spin dynamics in perpendicularly magnetized ADLs [1] by extending the simple rules on the effective wavelength and on the effective wave vector that were found for in-plane magnetized ADLs and their dependence on the corresponding Bloch quantities [2,3]. From the inspection of spatial profiles of collective modes it is possible to identify a characteristic wavelength which is commensurable with the periodicity a of the system. [1] P. Malagò et al., “Effective properties of perpendicularly magnetized 2D antidot lattices” in preparation [2] R. Zivieri and L. Giovannini Metamaterials 6 (2012) e126 [3] R. Zivieri and L. Giovannini Photon. Nanostruct: Fundam. Appl. 11 (2013) 191
2015
2D antidot lattices, magnonic metamaterials, perpendicular magnetization
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2338463
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