Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect

Abstract There is urgent need for spintronics materials exhibiting a large voltage modulation effect to fulfill the great demand for high-speed, low-power-consumption information processing systems. Fcc-Co (111)-based systems are a promising option for research on the voltage effect, on account of t...

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Autores principales:	Tomohiro Nozaki, Shingo Tamaru, Makoto Konoto, Takayuki Nozaki, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/29c5e36d0e88492e99d10058fe2df4f1
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spelling	oai:doaj.org-article:29c5e36d0e88492e99d10058fe2df4f12021-11-08T10:50:29ZLarge voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect10.1038/s41598-021-00960-w2045-2322https://doaj.org/article/29c5e36d0e88492e99d10058fe2df4f12021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00960-whttps://doaj.org/toc/2045-2322Abstract There is urgent need for spintronics materials exhibiting a large voltage modulation effect to fulfill the great demand for high-speed, low-power-consumption information processing systems. Fcc-Co (111)-based systems are a promising option for research on the voltage effect, on account of their large perpendicular magnetic anisotropy (PMA) and high degree of freedom in structure. Aiming to observe a large voltage effect in a fcc-Co (111)-based system at room temperature, we investigated the voltage-induced coercivity (H c) change of perpendicularly magnetized Pt/heavy metal/Co/CoO/amorphous TiO x structures. The thin CoO layer in the structure was the result of the surface oxidation of Co. We observed a large voltage-induced H c change of 20.2 mT by applying 2 V (0.32 V/nm) to a sample without heavy metal insertion, and an H c change of 15.4 mT by applying 1.8 V (0.29 V/nm) to an Ir-inserted sample. The relative thick Co thickness, Co surface oxidation, and large dielectric constant of TiO x layer could be related to the large voltage-induced H c change. Furthermore, we demonstrated the separate adjustment of H c and a voltage-induced H c change by utilizing both upper and lower interfaces of Co.Tomohiro NozakiShingo TamaruMakoto KonotoTakayuki NozakiHitoshi KubotaAkio FukushimaShinji YuasaNature 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 Tomohiro Nozaki Shingo Tamaru Makoto Konoto Takayuki Nozaki Hitoshi Kubota Akio Fukushima Shinji Yuasa Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
description	Abstract There is urgent need for spintronics materials exhibiting a large voltage modulation effect to fulfill the great demand for high-speed, low-power-consumption information processing systems. Fcc-Co (111)-based systems are a promising option for research on the voltage effect, on account of their large perpendicular magnetic anisotropy (PMA) and high degree of freedom in structure. Aiming to observe a large voltage effect in a fcc-Co (111)-based system at room temperature, we investigated the voltage-induced coercivity (H c) change of perpendicularly magnetized Pt/heavy metal/Co/CoO/amorphous TiO x structures. The thin CoO layer in the structure was the result of the surface oxidation of Co. We observed a large voltage-induced H c change of 20.2 mT by applying 2 V (0.32 V/nm) to a sample without heavy metal insertion, and an H c change of 15.4 mT by applying 1.8 V (0.29 V/nm) to an Ir-inserted sample. The relative thick Co thickness, Co surface oxidation, and large dielectric constant of TiO x layer could be related to the large voltage-induced H c change. Furthermore, we demonstrated the separate adjustment of H c and a voltage-induced H c change by utilizing both upper and lower interfaces of Co.
format	article
author	Tomohiro Nozaki Shingo Tamaru Makoto Konoto Takayuki Nozaki Hitoshi Kubota Akio Fukushima Shinji Yuasa
author_facet	Tomohiro Nozaki Shingo Tamaru Makoto Konoto Takayuki Nozaki Hitoshi Kubota Akio Fukushima Shinji Yuasa
author_sort	Tomohiro Nozaki
title	Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
title_short	Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
title_full	Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
title_fullStr	Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
title_full_unstemmed	Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
title_sort	large voltage-induced coercivity change in pt/co/coo/amorphous tio x structure and heavy metal insertion effect
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/29c5e36d0e88492e99d10058fe2df4f1
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Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect

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