Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size

The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and exchange bias (EB) effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to in...

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Autores: Salaheldeen Hassan, M., Nafady, Ayman, Abu-Dief, Ahmed M., Díaz Crespo, Rosario, Andrés González, Juan Pedro, López Antón, Ricardo, Blanco, Jesús A., Álvarez-Alonso, Pablo, Fernández Garcia, María Paz
Formato: artículo
Fecha de publicación:2022
País:España
Recursos:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/30270
Acesso em linha:http://hdl.handle.net/10578/30270
Access Level:acceso abierto
Palavra-chave:Nanostructured thin films
Micromagnetic simulation
Domain walls
Perpendicular magnetic anisotropy
Exchange bias
Películas finas nanoestructuradas
Simulación micromagnética
Paredes de dominio
Anisotropía magnética perpendicular
Sesgo de intercambio
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spelling Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole SizeSalaheldeen Hassan, M.Nafady, AymanAbu-Dief, Ahmed M.Díaz Crespo, RosarioAndrés González, Juan PedroLópez Antón, RicardoBlanco, Jesús A.Álvarez-Alonso, PabloFernández Garcia, María PazNanostructured thin filmsMicromagnetic simulationDomain wallsPerpendicular magnetic anisotropyExchange biasPelículas finas nanoestructuradasSimulación micromagnéticaParedes de dominioAnisotropía magnética perpendicularSesgo de intercambioThe interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and exchange bias (EB) effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce a significant out-of-plane component of the magnetic easy axis and EB. In this study, 30 nm thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, maintaining the hexagonal lattice parameter at 107 nm. Increase of the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was observed in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration induces extra high-energy superdomain walls for edge-to-edge distance >27 nm and high-energy stripe magnetic domains below 27 nm, which could play an important role in the change of the magnetic easy axis towards the perpendicular directionEl interés por las nanoestructuras magnéticas que exhiben anisotropía magnética perpendicular y efecto de sesgo de intercambio (EB) ha aumentado en los últimos años debido a sus aplicaciones en una nueva generación de dispositivos espintrónicos que combinan varias funcionalidades. Presentamos un proceso de nanofabricación utilizado para inducir una componente significativa fuera del plano del eje magnético fácil y del EB. En este estudio, se depositaron multicapas de CoO/Co de 30 nm de espesor sobre plantillas de alúmina nanoestructurada con un amplio rango de diámetros de poro, 34 nm ≤ Dp ≤ 96 nm, manteniendo el parámetro de red hexagonal en 107 nm. Se observó un aumento del campo de polarización de intercambio (HEB) y de la coercitividad (HC) (12 veces y 27 veces, respectivamente) en las películas nanoestructuradas en comparación con la película sin patrón. La marcada dependencia de HEB y HC con los diámetros de los agujeros antidotados señala un cambio de la anisotropía magnética de dentro a fuera del plano a un diámetro de nanoagujero de ∼75 nm. La simulación micromagnética muestra la existencia de capas antiferromagnéticas que generan una configuración magnética excepcional alrededor de los agujeros, denominada estado de antivórtice. Esta configuración induce paredes de superdominio extra de alta energía para la distancia de borde a borde >27 nm y dominios magnéticos de franja de alta energía por debajo de 27 nm, que podrían desempeñar un papel importante en el cambio del eje magnético fácil hacia la dirección perpendicularMDPI202220222022info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10578/30270reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/302702026-05-27T07:36:41Z
dc.title.none.fl_str_mv Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
title Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
spellingShingle Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
Salaheldeen Hassan, M.
Nanostructured thin films
Micromagnetic simulation
Domain walls
Perpendicular magnetic anisotropy
Exchange bias
Películas finas nanoestructuradas
Simulación micromagnética
Paredes de dominio
Anisotropía magnética perpendicular
Sesgo de intercambio
title_short Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
title_full Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
title_fullStr Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
title_full_unstemmed Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
title_sort Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size
dc.creator.none.fl_str_mv Salaheldeen Hassan, M.
Nafady, Ayman
Abu-Dief, Ahmed M.
Díaz Crespo, Rosario
Andrés González, Juan Pedro
López Antón, Ricardo
Blanco, Jesús A.
Álvarez-Alonso, Pablo
Fernández Garcia, María Paz
author Salaheldeen Hassan, M.
author_facet Salaheldeen Hassan, M.
Nafady, Ayman
Abu-Dief, Ahmed M.
Díaz Crespo, Rosario
Andrés González, Juan Pedro
López Antón, Ricardo
Blanco, Jesús A.
Álvarez-Alonso, Pablo
Fernández Garcia, María Paz
author_role author
author2 Nafady, Ayman
Abu-Dief, Ahmed M.
Díaz Crespo, Rosario
Andrés González, Juan Pedro
López Antón, Ricardo
Blanco, Jesús A.
Álvarez-Alonso, Pablo
Fernández Garcia, María Paz
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Nanostructured thin films
Micromagnetic simulation
Domain walls
Perpendicular magnetic anisotropy
Exchange bias
Películas finas nanoestructuradas
Simulación micromagnética
Paredes de dominio
Anisotropía magnética perpendicular
Sesgo de intercambio
topic Nanostructured thin films
Micromagnetic simulation
Domain walls
Perpendicular magnetic anisotropy
Exchange bias
Películas finas nanoestructuradas
Simulación micromagnética
Paredes de dominio
Anisotropía magnética perpendicular
Sesgo de intercambio
description The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and exchange bias (EB) effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce a significant out-of-plane component of the magnetic easy axis and EB. In this study, 30 nm thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, maintaining the hexagonal lattice parameter at 107 nm. Increase of the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was observed in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration induces extra high-energy superdomain walls for edge-to-edge distance >27 nm and high-energy stripe magnetic domains below 27 nm, which could play an important role in the change of the magnetic easy axis towards the perpendicular direction
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10578/30270
url http://hdl.handle.net/10578/30270
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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