Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires

Cobalt nanowires have been synthesized by electrochemical deposition using track-etched anodized aluminum oxide (AAO) templates. Nanowires with varying spacing-to-diameter ratios were prepared, and their magnetic properties were investigated. It is found that the nanowires’ easy magnetization direct...

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Autores principales:	Hafsa Khurshid, Rahana Yoosuf, Bashar Afif Issa, Atta G. Attaelmanan, George Hadjipanayis
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cobalt nanowires magnetic interactions electrochemical deposition Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8a512be6855142fd90061b2f0136fef0
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spelling	oai:doaj.org-article:8a512be6855142fd90061b2f0136fef02021-11-25T18:31:57ZTuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires10.3390/nano111130422079-4991https://doaj.org/article/8a512be6855142fd90061b2f0136fef02021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3042https://doaj.org/toc/2079-4991Cobalt nanowires have been synthesized by electrochemical deposition using track-etched anodized aluminum oxide (AAO) templates. Nanowires with varying spacing-to-diameter ratios were prepared, and their magnetic properties were investigated. It is found that the nanowires’ easy magnetization direction switches from parallel to perpendicular to the nanowire growth direction when the nanowire’s spacing-to-diameter ratio is reduced below 0.7, or when the nanowires’ packing density is increased above 5%. Upon further reduction in the spacing-to-diameter ratio, nanowires’ magnetic properties exhibit an isotropic behavior. Apart from shape anisotropy, strong dipolar interactions among nanowires facilitate additional uniaxial anisotropy, favoring an easy magnetization direction perpendicular to their growth direction. The magnetic interactions among the nanowires were studied using the standard method of remanence curves. The demagnetization curves and Delta m (Δm) plots showed that the nanowires interact via dipolar interactions that act as an additional uniaxial anisotropy favoring an easy magnetization direction perpendicular to the nanowire growth direction. The broadening of the dipolar component of Δm plots indicate an increase in the switching field distribution with the increase in the nanowires’ diameter. Our findings provide an important insight into the magnetic behavior of cobalt nanowires, meaning that it is crucial to design them according to the specific requirements for the application purposes.Hafsa KhurshidRahana YoosufBashar Afif IssaAtta G. AttaelmananGeorge HadjipanayisMDPI AGarticlecobalt nanowiresmagnetic interactionselectrochemical depositionChemistryQD1-999ENNanomaterials, Vol 11, Iss 3042, p 3042 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cobalt nanowires magnetic interactions electrochemical deposition Chemistry QD1-999
spellingShingle	cobalt nanowires magnetic interactions electrochemical deposition Chemistry QD1-999 Hafsa Khurshid Rahana Yoosuf Bashar Afif Issa Atta G. Attaelmanan George Hadjipanayis Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
description	Cobalt nanowires have been synthesized by electrochemical deposition using track-etched anodized aluminum oxide (AAO) templates. Nanowires with varying spacing-to-diameter ratios were prepared, and their magnetic properties were investigated. It is found that the nanowires’ easy magnetization direction switches from parallel to perpendicular to the nanowire growth direction when the nanowire’s spacing-to-diameter ratio is reduced below 0.7, or when the nanowires’ packing density is increased above 5%. Upon further reduction in the spacing-to-diameter ratio, nanowires’ magnetic properties exhibit an isotropic behavior. Apart from shape anisotropy, strong dipolar interactions among nanowires facilitate additional uniaxial anisotropy, favoring an easy magnetization direction perpendicular to their growth direction. The magnetic interactions among the nanowires were studied using the standard method of remanence curves. The demagnetization curves and Delta m (Δm) plots showed that the nanowires interact via dipolar interactions that act as an additional uniaxial anisotropy favoring an easy magnetization direction perpendicular to the nanowire growth direction. The broadening of the dipolar component of Δm plots indicate an increase in the switching field distribution with the increase in the nanowires’ diameter. Our findings provide an important insight into the magnetic behavior of cobalt nanowires, meaning that it is crucial to design them according to the specific requirements for the application purposes.
format	article
author	Hafsa Khurshid Rahana Yoosuf Bashar Afif Issa Atta G. Attaelmanan George Hadjipanayis
author_facet	Hafsa Khurshid Rahana Yoosuf Bashar Afif Issa Atta G. Attaelmanan George Hadjipanayis
author_sort	Hafsa Khurshid
title	Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
title_short	Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
title_full	Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
title_fullStr	Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
title_full_unstemmed	Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires
title_sort	tuning easy magnetization direction and magnetostatic interactions in high aspect ratio nanowires
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8a512be6855142fd90061b2f0136fef0
work_keys_str_mv	AT hafsakhurshid tuningeasymagnetizationdirectionandmagnetostaticinteractionsinhighaspectrationanowires AT rahanayoosuf tuningeasymagnetizationdirectionandmagnetostaticinteractionsinhighaspectrationanowires AT basharafifissa tuningeasymagnetizationdirectionandmagnetostaticinteractionsinhighaspectrationanowires AT attagattaelmanan tuningeasymagnetizationdirectionandmagnetostaticinteractionsinhighaspectrationanowires AT georgehadjipanayis tuningeasymagnetizationdirectionandmagnetostaticinteractionsinhighaspectrationanowires
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Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires

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