Pinned domain wall oscillator as a tuneable direct current spin wave emitter

Abstract Local perturbations in the relative orientation of the magnetic moments in a continuous magnetic system can propagate in the form of waves. These so-called spin waves represent a promising candidate as an information carrier for spin-based low-power applications. A localized, energy-efficie...

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Autores principales:	Michele Voto, Luis Lopez-Diaz, Eduardo Martinez
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6b1cc8bc169e4059a9655d17e57c709f
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spelling	oai:doaj.org-article:6b1cc8bc169e4059a9655d17e57c709f2021-12-02T15:05:30ZPinned domain wall oscillator as a tuneable direct current spin wave emitter10.1038/s41598-017-13806-12045-2322https://doaj.org/article/6b1cc8bc169e4059a9655d17e57c709f2017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13806-1https://doaj.org/toc/2045-2322Abstract Local perturbations in the relative orientation of the magnetic moments in a continuous magnetic system can propagate in the form of waves. These so-called spin waves represent a promising candidate as an information carrier for spin-based low-power applications. A localized, energy-efficient excitation of coherent and short-wavelength spin waves is a crucial technological requirement, and alternatives to excitation via the Oersted field of an alternating current must be explored. Here, we show how a domain wall pinned at a geometrical constriction in a perpendicularly magnetized thin nanowire emits spin waves when forced to rotate by the application of a low direct current flowing along the wire. Spin waves are excited by the in-plane stray field of the rotating domain wall and propagate at an odd harmonic of the domain wall rotation frequency in the direction of the electron’s flow. The application of an external field, opposing domain wall depinning induced by the current, breaks the symmetry for spin wave propagation in the two domains, allowing emission in both directions but at different frequencies. The results presented define a new approach to manufacture tuneable high-frequency spin wave emitters of easy fabrication and low power consumption.Michele VotoLuis Lopez-DiazEduardo MartinezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Michele Voto Luis Lopez-Diaz Eduardo Martinez Pinned domain wall oscillator as a tuneable direct current spin wave emitter
description	Abstract Local perturbations in the relative orientation of the magnetic moments in a continuous magnetic system can propagate in the form of waves. These so-called spin waves represent a promising candidate as an information carrier for spin-based low-power applications. A localized, energy-efficient excitation of coherent and short-wavelength spin waves is a crucial technological requirement, and alternatives to excitation via the Oersted field of an alternating current must be explored. Here, we show how a domain wall pinned at a geometrical constriction in a perpendicularly magnetized thin nanowire emits spin waves when forced to rotate by the application of a low direct current flowing along the wire. Spin waves are excited by the in-plane stray field of the rotating domain wall and propagate at an odd harmonic of the domain wall rotation frequency in the direction of the electron’s flow. The application of an external field, opposing domain wall depinning induced by the current, breaks the symmetry for spin wave propagation in the two domains, allowing emission in both directions but at different frequencies. The results presented define a new approach to manufacture tuneable high-frequency spin wave emitters of easy fabrication and low power consumption.
format	article
author	Michele Voto Luis Lopez-Diaz Eduardo Martinez
author_facet	Michele Voto Luis Lopez-Diaz Eduardo Martinez
author_sort	Michele Voto
title	Pinned domain wall oscillator as a tuneable direct current spin wave emitter
title_short	Pinned domain wall oscillator as a tuneable direct current spin wave emitter
title_full	Pinned domain wall oscillator as a tuneable direct current spin wave emitter
title_fullStr	Pinned domain wall oscillator as a tuneable direct current spin wave emitter
title_full_unstemmed	Pinned domain wall oscillator as a tuneable direct current spin wave emitter
title_sort	pinned domain wall oscillator as a tuneable direct current spin wave emitter
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6b1cc8bc169e4059a9655d17e57c709f
work_keys_str_mv	AT michelevoto pinneddomainwalloscillatorasatuneabledirectcurrentspinwaveemitter AT luislopezdiaz pinneddomainwalloscillatorasatuneabledirectcurrentspinwaveemitter AT eduardomartinez pinneddomainwalloscillatorasatuneabledirectcurrentspinwaveemitter
_version_	1718388835867426816

Pinned domain wall oscillator as a tuneable direct current spin wave emitter

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