Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes

Abstract Ever since the first observation of all-optical switching of magnetization in the ferrimagnetic alloy GdFeCo using femtosecond laser pulses, there has been significant interest in exploiting this process for data-recording applications. In particular, the ultrafast speed of the magnetic rev...

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Autores principales:	L. Avilés-Félix, A. Olivier, G. Li, C. S. Davies, L. Álvaro-Gómez, M. Rubio-Roy, S. Auffret, A. Kirilyuk, A. V. Kimel, Th. Rasing, L. D. Buda-Prejbeanu, R. C. Sousa, B. Dieny, I. L. Prejbeanu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/87549a50d5f244e4b3ae0a6c0faa4d67
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spelling	oai:doaj.org-article:87549a50d5f244e4b3ae0a6c0faa4d672021-12-02T17:04:08ZSingle-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes10.1038/s41598-020-62104-w2045-2322https://doaj.org/article/87549a50d5f244e4b3ae0a6c0faa4d672020-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-62104-whttps://doaj.org/toc/2045-2322Abstract Ever since the first observation of all-optical switching of magnetization in the ferrimagnetic alloy GdFeCo using femtosecond laser pulses, there has been significant interest in exploiting this process for data-recording applications. In particular, the ultrafast speed of the magnetic reversal can enable the writing speeds associated with magnetic memory devices to be potentially pushed towards THz frequencies. This work reports the development of perpendicular magnetic tunnel junctions incorporating a stack of Tb/Co nanolayers whose magnetization can be all-optically controlled via helicity-independent single-shot switching. Toggling of the magnetization of the Tb/Co electrode was achieved using either 60 femtosecond-long or 5 picosecond-long laser pulses, with incident fluences down to 3.5 mJ/cm2, for Co-rich compositions of the stack either in isolation or coupled to a CoFeB-electrode/MgO-barrier tunnel-junction stack. Successful switching of the CoFeB-[Tb/Co] electrodes was obtained even after annealing at 250 °C. After integration of the [Tb/Co]-based electrodes within perpendicular magnetic tunnel junctions yielded a maximum tunneling magnetoresistance signal of 41% and RxA value of 150 Ωμm2 with current-in-plane measurements and ratios between 28% and 38% in nanopatterned pillars. These results represent a breakthrough for the development of perpendicular magnetic tunnel junctions controllable using single laser pulses, and offer a technologically-viable path towards the realization of hybrid spintronic-photonic systems featuring THz switching speeds.L. Avilés-FélixA. OlivierG. LiC. S. DaviesL. Álvaro-GómezM. Rubio-RoyS. AuffretA. KirilyukA. V. KimelTh. RasingL. D. Buda-PrejbeanuR. C. SousaB. DienyI. L. PrejbeanuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Avilés-Félix A. Olivier G. Li C. S. Davies L. Álvaro-Gómez M. Rubio-Roy S. Auffret A. Kirilyuk A. V. Kimel Th. Rasing L. D. Buda-Prejbeanu R. C. Sousa B. Dieny I. L. Prejbeanu Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
description	Abstract Ever since the first observation of all-optical switching of magnetization in the ferrimagnetic alloy GdFeCo using femtosecond laser pulses, there has been significant interest in exploiting this process for data-recording applications. In particular, the ultrafast speed of the magnetic reversal can enable the writing speeds associated with magnetic memory devices to be potentially pushed towards THz frequencies. This work reports the development of perpendicular magnetic tunnel junctions incorporating a stack of Tb/Co nanolayers whose magnetization can be all-optically controlled via helicity-independent single-shot switching. Toggling of the magnetization of the Tb/Co electrode was achieved using either 60 femtosecond-long or 5 picosecond-long laser pulses, with incident fluences down to 3.5 mJ/cm2, for Co-rich compositions of the stack either in isolation or coupled to a CoFeB-electrode/MgO-barrier tunnel-junction stack. Successful switching of the CoFeB-[Tb/Co] electrodes was obtained even after annealing at 250 °C. After integration of the [Tb/Co]-based electrodes within perpendicular magnetic tunnel junctions yielded a maximum tunneling magnetoresistance signal of 41% and RxA value of 150 Ωμm2 with current-in-plane measurements and ratios between 28% and 38% in nanopatterned pillars. These results represent a breakthrough for the development of perpendicular magnetic tunnel junctions controllable using single laser pulses, and offer a technologically-viable path towards the realization of hybrid spintronic-photonic systems featuring THz switching speeds.
format	article
author	L. Avilés-Félix A. Olivier G. Li C. S. Davies L. Álvaro-Gómez M. Rubio-Roy S. Auffret A. Kirilyuk A. V. Kimel Th. Rasing L. D. Buda-Prejbeanu R. C. Sousa B. Dieny I. L. Prejbeanu
author_facet	L. Avilés-Félix A. Olivier G. Li C. S. Davies L. Álvaro-Gómez M. Rubio-Roy S. Auffret A. Kirilyuk A. V. Kimel Th. Rasing L. D. Buda-Prejbeanu R. C. Sousa B. Dieny I. L. Prejbeanu
author_sort	L. Avilés-Félix
title	Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
title_short	Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
title_full	Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
title_fullStr	Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
title_full_unstemmed	Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes
title_sort	single-shot all-optical switching of magnetization in tb/co multilayer-based electrodes
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/87549a50d5f244e4b3ae0a6c0faa4d67
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Single-shot all-optical switching of magnetization in Tb/Co multilayer-based electrodes

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