Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film

Abstract Voltage or electric field induced magnetization dynamics promises low power spintronics devices. For successful operation of some spintronics devices such as magnetic oscillators and magnetization switching devices a clear understanding of nonlinear magnetization dynamics is required. Here,...

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Autores principales:	Bivas Rana, Yasuhiro Fukuma, Katsuya Miura, Hiromasa Takahashi, YoshiChika Otani
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/47f854115f9b4f76a39cdbbc71a04c5d
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spelling	oai:doaj.org-article:47f854115f9b4f76a39cdbbc71a04c5d2021-12-02T11:51:11ZEffect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film10.1038/s41598-017-02427-32045-2322https://doaj.org/article/47f854115f9b4f76a39cdbbc71a04c5d2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02427-3https://doaj.org/toc/2045-2322Abstract Voltage or electric field induced magnetization dynamics promises low power spintronics devices. For successful operation of some spintronics devices such as magnetic oscillators and magnetization switching devices a clear understanding of nonlinear magnetization dynamics is required. Here, we report a detailed experimental and micromagnetic simulation study about the effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film. Experimental results show that the resonance line-width and frequency remains constant, whereas cone angle of the magnetization precession increases linearly with square-root of excitation power below threshold value, known as linear excitation regime. Above threshold power, the dynamics enters into nonlinear regime where resonance line-width monotonically increases and resonance frequency monotonically decreases with increasing excitation power. Simulation results reveal that a strong nonlinear and incoherent magnetization dynamics are observed in our experiment above the threshold power which reduces dynamic magnetic signal by suppressing large cone angle of magnetization precession. Moreover, a significant transfer of spin angular momentum from uniform FMR mode to its degenerate spin waves outside of excitation area further restrict the cone angle of precession within only few degrees in our device. Our results will be very useful to develop all-voltage-controlled spintronics devices.Bivas RanaYasuhiro FukumaKatsuya MiuraHiromasa TakahashiYoshiChika OtaniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bivas Rana Yasuhiro Fukuma Katsuya Miura Hiromasa Takahashi YoshiChika Otani Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
description	Abstract Voltage or electric field induced magnetization dynamics promises low power spintronics devices. For successful operation of some spintronics devices such as magnetic oscillators and magnetization switching devices a clear understanding of nonlinear magnetization dynamics is required. Here, we report a detailed experimental and micromagnetic simulation study about the effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film. Experimental results show that the resonance line-width and frequency remains constant, whereas cone angle of the magnetization precession increases linearly with square-root of excitation power below threshold value, known as linear excitation regime. Above threshold power, the dynamics enters into nonlinear regime where resonance line-width monotonically increases and resonance frequency monotonically decreases with increasing excitation power. Simulation results reveal that a strong nonlinear and incoherent magnetization dynamics are observed in our experiment above the threshold power which reduces dynamic magnetic signal by suppressing large cone angle of magnetization precession. Moreover, a significant transfer of spin angular momentum from uniform FMR mode to its degenerate spin waves outside of excitation area further restrict the cone angle of precession within only few degrees in our device. Our results will be very useful to develop all-voltage-controlled spintronics devices.
format	article
author	Bivas Rana Yasuhiro Fukuma Katsuya Miura Hiromasa Takahashi YoshiChika Otani
author_facet	Bivas Rana Yasuhiro Fukuma Katsuya Miura Hiromasa Takahashi YoshiChika Otani
author_sort	Bivas Rana
title	Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
title_short	Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
title_full	Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
title_fullStr	Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
title_full_unstemmed	Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film
title_sort	effect of excitation power on voltage induced local magnetization dynamics in an ultrathin cofeb film
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/47f854115f9b4f76a39cdbbc71a04c5d
work_keys_str_mv	AT bivasrana effectofexcitationpoweronvoltageinducedlocalmagnetizationdynamicsinanultrathincofebfilm AT yasuhirofukuma effectofexcitationpoweronvoltageinducedlocalmagnetizationdynamicsinanultrathincofebfilm AT katsuyamiura effectofexcitationpoweronvoltageinducedlocalmagnetizationdynamicsinanultrathincofebfilm AT hiromasatakahashi effectofexcitationpoweronvoltageinducedlocalmagnetizationdynamicsinanultrathincofebfilm AT yoshichikaotani effectofexcitationpoweronvoltageinducedlocalmagnetizationdynamicsinanultrathincofebfilm
_version_	1718395160603131904

Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film

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