Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation

Abstract The role of three-dimensionality in a ferromagnetic medium in ruling the propagation properties of spin-waves (SW) has been one of the main focuses of the research activity in recent years. In this context, we investigate the evolution of the SW dispersion (frequency vs wave vector) induced...

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Autores principales:	Federico Montoncello, Gianluca Gubbiotti
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/48cf207c34c04ec2b54cb310e7083eb5
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spelling	oai:doaj.org-article:48cf207c34c04ec2b54cb310e7083eb52021-11-08T10:50:41ZControlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation10.1038/s41598-021-00479-02045-2322https://doaj.org/article/48cf207c34c04ec2b54cb310e7083eb52021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00479-0https://doaj.org/toc/2045-2322Abstract The role of three-dimensionality in a ferromagnetic medium in ruling the propagation properties of spin-waves (SW) has been one of the main focuses of the research activity in recent years. In this context, we investigate the evolution of the SW dispersion (frequency vs wave vector) induced by a progressive vertical undulation of a ferromagnetic film. The geometric undulation is taken along a single direction and is periodic with constant period, while the amplitude (differential maximum height with respect to the film thickness) is gradually increased from 0 to 60 nm. We study the characteristic modification of the internal effective field and link it to the resulting SW dispersions and spatial profile. These systems display at once features both of a planar film and a discretized medium, and the dispersion curves change not only when SWs propagate along the undulation direction, but also perpendicular to it. We discuss the geometric and magnetic conditions for having either the invariance of the SW group velocity with respect to even major changes in the undulation, or a large group velocity for some edge modes. We address a potential dual-band activity, namely the simultaneous propagation of two independent SW-signals, with separated frequency bands and disjoint oscillation regions.Federico MontoncelloGianluca GubbiottiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Federico Montoncello Gianluca Gubbiotti Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
description	Abstract The role of three-dimensionality in a ferromagnetic medium in ruling the propagation properties of spin-waves (SW) has been one of the main focuses of the research activity in recent years. In this context, we investigate the evolution of the SW dispersion (frequency vs wave vector) induced by a progressive vertical undulation of a ferromagnetic film. The geometric undulation is taken along a single direction and is periodic with constant period, while the amplitude (differential maximum height with respect to the film thickness) is gradually increased from 0 to 60 nm. We study the characteristic modification of the internal effective field and link it to the resulting SW dispersions and spatial profile. These systems display at once features both of a planar film and a discretized medium, and the dispersion curves change not only when SWs propagate along the undulation direction, but also perpendicular to it. We discuss the geometric and magnetic conditions for having either the invariance of the SW group velocity with respect to even major changes in the undulation, or a large group velocity for some edge modes. We address a potential dual-band activity, namely the simultaneous propagation of two independent SW-signals, with separated frequency bands and disjoint oscillation regions.
format	article
author	Federico Montoncello Gianluca Gubbiotti
author_facet	Federico Montoncello Gianluca Gubbiotti
author_sort	Federico Montoncello
title	Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
title_short	Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
title_full	Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
title_fullStr	Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
title_full_unstemmed	Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
title_sort	controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/48cf207c34c04ec2b54cb310e7083eb5
work_keys_str_mv	AT federicomontoncello controllingthethreedimensionalpropagationofspinwavesincontinuousferromagneticfilmswithanincreasingoutofplaneundulation AT gianlucagubbiotti controllingthethreedimensionalpropagationofspinwavesincontinuousferromagneticfilmswithanincreasingoutofplaneundulation
_version_	1718442613485338624

Controlling the three dimensional propagation of spin waves in continuous ferromagnetic films with an increasing out of plane undulation

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