Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions

Abstract We have studied current induced magnetization switching in W/CoFeB/MgO based three terminal magnetic tunnel junctions. The switching driven by spin—orbit torque (SOT) is evaluated in the so-called type-Y structure, in which the magnetic easy-axis of the CoFeB layer lies in the film plane an...

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Autores principales:	Shinji Isogami, Yohei Shiokawa, Atsushi Tsumita, Eiji Komura, Yugo Ishitani, Kosuke Hamanaka, Tomohiro Taniguchi, Seiji Mitani, Tomoyuki Sasaki, Masamitsu Hayashi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/103ffb4181984133bfabc6134383ec63
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spelling	oai:doaj.org-article:103ffb4181984133bfabc6134383ec632021-12-02T16:45:54ZSpin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions10.1038/s41598-021-95422-82045-2322https://doaj.org/article/103ffb4181984133bfabc6134383ec632021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95422-8https://doaj.org/toc/2045-2322Abstract We have studied current induced magnetization switching in W/CoFeB/MgO based three terminal magnetic tunnel junctions. The switching driven by spin—orbit torque (SOT) is evaluated in the so-called type-Y structure, in which the magnetic easy-axis of the CoFeB layer lies in the film plane and is orthogonal to the current flow. The effective spin Hall angle estimated from the bias field dependence of critical current (I c) is ~ 0.07. The field and current dependence of the switching probability are studied. The field and DC current induced switching can be described using a model based on thermally assisted magnetization switching. In contrast, the 50 ns long pulse current dependence of the switching probability shows significant deviation from the model, even if contribution from the field-like torque is included. The deviation is particularly evident when the threshold switching current is larger. These results show that conventional thermally assisted magnetization switching model cannot be used to describe SOT induced switching using short current pulses.Shinji IsogamiYohei ShiokawaAtsushi TsumitaEiji KomuraYugo IshitaniKosuke HamanakaTomohiro TaniguchiSeiji MitaniTomoyuki SasakiMasamitsu HayashiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shinji Isogami Yohei Shiokawa Atsushi Tsumita Eiji Komura Yugo Ishitani Kosuke Hamanaka Tomohiro Taniguchi Seiji Mitani Tomoyuki Sasaki Masamitsu Hayashi Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
description	Abstract We have studied current induced magnetization switching in W/CoFeB/MgO based three terminal magnetic tunnel junctions. The switching driven by spin—orbit torque (SOT) is evaluated in the so-called type-Y structure, in which the magnetic easy-axis of the CoFeB layer lies in the film plane and is orthogonal to the current flow. The effective spin Hall angle estimated from the bias field dependence of critical current (I c) is ~ 0.07. The field and current dependence of the switching probability are studied. The field and DC current induced switching can be described using a model based on thermally assisted magnetization switching. In contrast, the 50 ns long pulse current dependence of the switching probability shows significant deviation from the model, even if contribution from the field-like torque is included. The deviation is particularly evident when the threshold switching current is larger. These results show that conventional thermally assisted magnetization switching model cannot be used to describe SOT induced switching using short current pulses.
format	article
author	Shinji Isogami Yohei Shiokawa Atsushi Tsumita Eiji Komura Yugo Ishitani Kosuke Hamanaka Tomohiro Taniguchi Seiji Mitani Tomoyuki Sasaki Masamitsu Hayashi
author_facet	Shinji Isogami Yohei Shiokawa Atsushi Tsumita Eiji Komura Yugo Ishitani Kosuke Hamanaka Tomohiro Taniguchi Seiji Mitani Tomoyuki Sasaki Masamitsu Hayashi
author_sort	Shinji Isogami
title	Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
title_short	Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
title_full	Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
title_fullStr	Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
title_full_unstemmed	Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions
title_sort	spin–orbit torque driven magnetization switching in w/cofeb/mgo-based type-y three terminal magnetic tunnel junctions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/103ffb4181984133bfabc6134383ec63
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Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions

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