Fluctuations and Pinning for Individually Manipulated Skyrmions

We numerically examine the dynamics of individually dragged skyrmions interacting simultaneously with an array of other skyrmions and quenched disorder. For drives just above depinning, we observe a broadband noise signal with a 1/f characteristic, while at higher drives, narrowband or white noise a...

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Autores principales:	C. J. O. Reichhardt, C. Reichhardt
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	skyrmion dynamic phases broadband noise telegraph noise depinning Physics QC1-999
Acceso en línea:	https://doaj.org/article/ac80bd83edb644109c84a1bede5fc392
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spelling	oai:doaj.org-article:ac80bd83edb644109c84a1bede5fc3922021-12-01T15:12:00ZFluctuations and Pinning for Individually Manipulated Skyrmions2296-424X10.3389/fphy.2021.767491https://doaj.org/article/ac80bd83edb644109c84a1bede5fc3922021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphy.2021.767491/fullhttps://doaj.org/toc/2296-424XWe numerically examine the dynamics of individually dragged skyrmions interacting simultaneously with an array of other skyrmions and quenched disorder. For drives just above depinning, we observe a broadband noise signal with a 1/f characteristic, while at higher drives, narrowband or white noise appears. Even in the absence of quenched disorder, the threshold force that must be applied to translate the driven skyrmion is finite due to elastic interactions with other skyrmions. The depinning threshold increases as the strength of the quenched disorder is raised. Above the depinning force, the skyrmion moves faster in the presence of quenched disorder than in a disorder-free system since the pinning sites prevent other skyrmions from being dragged along with the driven skyrmion. For strong pinning, we find a stick-slip motion of the driven skyrmion which produces a telegraph noise signature. The depinning threshold increases monotonically with skyrmion density in the absence of quenched disorder, but when pinning is present, the depinning threshold changes nonmonotonically with skyrmion density, and there are reentrant pinned phases due to a competition between pinning induced by the quenched disorder and that produced by the elastic interactions of the skyrmion lattice.C. J. O. ReichhardtC. ReichhardtFrontiers Media S.A.articleskyrmiondynamic phasesbroadband noisetelegraph noisedepinningPhysicsQC1-999ENFrontiers in Physics, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	skyrmion dynamic phases broadband noise telegraph noise depinning Physics QC1-999
spellingShingle	skyrmion dynamic phases broadband noise telegraph noise depinning Physics QC1-999 C. J. O. Reichhardt C. Reichhardt Fluctuations and Pinning for Individually Manipulated Skyrmions
description	We numerically examine the dynamics of individually dragged skyrmions interacting simultaneously with an array of other skyrmions and quenched disorder. For drives just above depinning, we observe a broadband noise signal with a 1/f characteristic, while at higher drives, narrowband or white noise appears. Even in the absence of quenched disorder, the threshold force that must be applied to translate the driven skyrmion is finite due to elastic interactions with other skyrmions. The depinning threshold increases as the strength of the quenched disorder is raised. Above the depinning force, the skyrmion moves faster in the presence of quenched disorder than in a disorder-free system since the pinning sites prevent other skyrmions from being dragged along with the driven skyrmion. For strong pinning, we find a stick-slip motion of the driven skyrmion which produces a telegraph noise signature. The depinning threshold increases monotonically with skyrmion density in the absence of quenched disorder, but when pinning is present, the depinning threshold changes nonmonotonically with skyrmion density, and there are reentrant pinned phases due to a competition between pinning induced by the quenched disorder and that produced by the elastic interactions of the skyrmion lattice.
format	article
author	C. J. O. Reichhardt C. Reichhardt
author_facet	C. J. O. Reichhardt C. Reichhardt
author_sort	C. J. O. Reichhardt
title	Fluctuations and Pinning for Individually Manipulated Skyrmions
title_short	Fluctuations and Pinning for Individually Manipulated Skyrmions
title_full	Fluctuations and Pinning for Individually Manipulated Skyrmions
title_fullStr	Fluctuations and Pinning for Individually Manipulated Skyrmions
title_full_unstemmed	Fluctuations and Pinning for Individually Manipulated Skyrmions
title_sort	fluctuations and pinning for individually manipulated skyrmions
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/ac80bd83edb644109c84a1bede5fc392
work_keys_str_mv	AT cjoreichhardt fluctuationsandpinningforindividuallymanipulatedskyrmions AT creichhardt fluctuationsandpinningforindividuallymanipulatedskyrmions
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Fluctuations and Pinning for Individually Manipulated Skyrmions

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