Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice

Abstract We report spin-wave excitations in annular antidot lattice fabricated from 15 nm-thin Ni80Fe20 film. The nanodots of 170 nm diameters are embedded in the 350 nm (diameter) antidot lattice to form the annular antidot lattice, which is arranged in a square lattice with edge-to-edge separation...

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Autores principales:	Nikita Porwal, Anulekha De, Sucheta Mondal, Koustuv Dutta, Samiran Choudhury, Jaivardhan Sinha, Anjan Barman, P. K. Datta
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/253c1b89e53545fa9bf8b3e9474d080a
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spelling	oai:doaj.org-article:253c1b89e53545fa9bf8b3e9474d080a2021-12-02T15:07:54ZObservation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice10.1038/s41598-019-48565-82045-2322https://doaj.org/article/253c1b89e53545fa9bf8b3e9474d080a2019-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-48565-8https://doaj.org/toc/2045-2322Abstract We report spin-wave excitations in annular antidot lattice fabricated from 15 nm-thin Ni80Fe20 film. The nanodots of 170 nm diameters are embedded in the 350 nm (diameter) antidot lattice to form the annular antidot lattice, which is arranged in a square lattice with edge-to-edge separation of 120 nm. A strong anisotropy in the spin-wave modes are observed with the change in orientation angle (ϕ) of the in-plane bias magnetic field by using Time-resolved Magneto-optic Kerr microscope. A flattened four-fold rotational symmetry, mode hopping and mode conversion leading to mode quenching for three prominent spin-wave modes are observed in this lattice with the variation of the bias field orientation. Micromagnetic simulations enable us to successfully reproduce the measured evolution of frequencies with the orientation of bias magnetic field, as well as to identify the spatial profiles of the modes. The magnetostatic field analysis, suggest the existence of magnetostatic coupling between the dot and antidot in annular antidot sample. Further local excitations of some selective spin-wave modes using numerical simulations showed the anisotropic spin-wave propagation through the lattice.Nikita PorwalAnulekha DeSucheta MondalKoustuv DuttaSamiran ChoudhuryJaivardhan SinhaAnjan BarmanP. K. DattaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nikita Porwal Anulekha De Sucheta Mondal Koustuv Dutta Samiran Choudhury Jaivardhan Sinha Anjan Barman P. K. Datta Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
description	Abstract We report spin-wave excitations in annular antidot lattice fabricated from 15 nm-thin Ni80Fe20 film. The nanodots of 170 nm diameters are embedded in the 350 nm (diameter) antidot lattice to form the annular antidot lattice, which is arranged in a square lattice with edge-to-edge separation of 120 nm. A strong anisotropy in the spin-wave modes are observed with the change in orientation angle (ϕ) of the in-plane bias magnetic field by using Time-resolved Magneto-optic Kerr microscope. A flattened four-fold rotational symmetry, mode hopping and mode conversion leading to mode quenching for three prominent spin-wave modes are observed in this lattice with the variation of the bias field orientation. Micromagnetic simulations enable us to successfully reproduce the measured evolution of frequencies with the orientation of bias magnetic field, as well as to identify the spatial profiles of the modes. The magnetostatic field analysis, suggest the existence of magnetostatic coupling between the dot and antidot in annular antidot sample. Further local excitations of some selective spin-wave modes using numerical simulations showed the anisotropic spin-wave propagation through the lattice.
format	article
author	Nikita Porwal Anulekha De Sucheta Mondal Koustuv Dutta Samiran Choudhury Jaivardhan Sinha Anjan Barman P. K. Datta
author_facet	Nikita Porwal Anulekha De Sucheta Mondal Koustuv Dutta Samiran Choudhury Jaivardhan Sinha Anjan Barman P. K. Datta
author_sort	Nikita Porwal
title	Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
title_short	Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
title_full	Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
title_fullStr	Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
title_full_unstemmed	Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice
title_sort	observation of angle-dependent mode conversion and mode hopping in 2d annular antidot lattice
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/253c1b89e53545fa9bf8b3e9474d080a
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Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice

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