Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy

Abstract CoFeB-based ultrathin films with perpendicular magnetic anisotropy are promising for different emerging technological applications such as nonvolatile memories with low power consumption and high-speed performance. In this work, the dynamical properties of [CoFeB (t CoFeB )/Pd (10 Å)]5 mult...

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Autores principales:	Ana S. Silva, Simão P. Sá, Sergey A. Bunyaev, Carlos Garcia, Iñigo J. Sola, Gleb N. Kakazei, Helder Crespo, David Navas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/290e111e3a6443e6b1140d06c3425d0e
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spelling	oai:doaj.org-article:290e111e3a6443e6b1140d06c3425d0e2021-12-02T15:14:14ZDynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy10.1038/s41598-020-79632-02045-2322https://doaj.org/article/290e111e3a6443e6b1140d06c3425d0e2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79632-0https://doaj.org/toc/2045-2322Abstract CoFeB-based ultrathin films with perpendicular magnetic anisotropy are promising for different emerging technological applications such as nonvolatile memories with low power consumption and high-speed performance. In this work, the dynamical properties of [CoFeB (t CoFeB )/Pd (10 Å)]5 multilayered ultrathin films (1 Å ≤ t CoFeB ≤ 5 Å) are studied by using two complementary methods: time-resolved magneto-optical Kerr effect and broadband ferromagnetic resonance. The perpendicular magnetization is confirmed for multilayers with t CoFeB ≤ 4 Å. The effective perpendicular magnetic anisotropy reaches a clear maximum at t CoFeB = 3 Å. Further increase of CoFeB layer thickness reduces the perpendicular magnetic anisotropy and the magnetization became in-plane oriented for t CoFeB ≥ 5 Å. This behaviour is explained by considering competing contributions from surface and magnetoelastic anisotropies. It was also found that the effective damping parameter α eff decreases with CoFeB layer thickness and for t CoFeB = 4 Å reaches a value of ~ 0.019 that is suitable for microwave applications.Ana S. SilvaSimão P. SáSergey A. BunyaevCarlos GarciaIñigo J. SolaGleb N. KakazeiHelder CrespoDavid NavasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ana S. Silva Simão P. Sá Sergey A. Bunyaev Carlos Garcia Iñigo J. Sola Gleb N. Kakazei Helder Crespo David Navas Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
description	Abstract CoFeB-based ultrathin films with perpendicular magnetic anisotropy are promising for different emerging technological applications such as nonvolatile memories with low power consumption and high-speed performance. In this work, the dynamical properties of [CoFeB (t CoFeB )/Pd (10 Å)]5 multilayered ultrathin films (1 Å ≤ t CoFeB ≤ 5 Å) are studied by using two complementary methods: time-resolved magneto-optical Kerr effect and broadband ferromagnetic resonance. The perpendicular magnetization is confirmed for multilayers with t CoFeB ≤ 4 Å. The effective perpendicular magnetic anisotropy reaches a clear maximum at t CoFeB = 3 Å. Further increase of CoFeB layer thickness reduces the perpendicular magnetic anisotropy and the magnetization became in-plane oriented for t CoFeB ≥ 5 Å. This behaviour is explained by considering competing contributions from surface and magnetoelastic anisotropies. It was also found that the effective damping parameter α eff decreases with CoFeB layer thickness and for t CoFeB = 4 Å reaches a value of ~ 0.019 that is suitable for microwave applications.
format	article
author	Ana S. Silva Simão P. Sá Sergey A. Bunyaev Carlos Garcia Iñigo J. Sola Gleb N. Kakazei Helder Crespo David Navas
author_facet	Ana S. Silva Simão P. Sá Sergey A. Bunyaev Carlos Garcia Iñigo J. Sola Gleb N. Kakazei Helder Crespo David Navas
author_sort	Ana S. Silva
title	Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
title_short	Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
title_full	Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
title_fullStr	Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
title_full_unstemmed	Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy
title_sort	dynamical behaviour of ultrathin [cofeb (t cofeb )/pd] films with perpendicular magnetic anisotropy
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/290e111e3a6443e6b1140d06c3425d0e
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Dynamical behaviour of ultrathin [CoFeB (t CoFeB )/Pd] films with perpendicular magnetic anisotropy

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