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Fabrication of FePt nanowires through pulsed electrodeposition into nanoporous alumina templates

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Abstract

One-dimensional magnetic nanostructures have been emerging as promising nanomaterials for biomedical applications. Among those types of nanoarchitectures, FePt nanowires are particularly interesting; since they are highly biocompatible and chemically inert, their magnetic properties can be tuned by controlling not only the atomic ratio of the two elements in the alloy structure but also the nanowire’s dimensions, and they have a high magnetic anisotropy. In this work, we report the fabrication of such nanostructures through pulsed electrodeposition into nanoporous aluminium oxide templates. Using this approach, we were able to control the composition of the produced nanoarchitectures by adjusting the thickness of the barrier layer, which is located at the bottom of the template, and the current density applied during the electrodeposition process. The obtained nanostructures exhibited a heterogeneous length distribution when Pt was present. Moreover, their magnetic characterization revealed an increase of the magnetic hysteresis, coercivity, remanence, and saturation field as the Fe atomic percent got higher. Furthermore, hysteresis loops of FePt nanowire arrays were simulated and compared with the experimental measurements. Such comparison suggested that the nanostructures with Pt in their composition might have different stoichiometries along their length.

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Adapted from Sousa et al. (2012b). Republished with permission of Royal Society of Chemistry, from Precise control of the filling stages in branched nanopores, Sousa, C. T.; Apolinario, A.; Leitao, D. C.; Pereira, A. M.; Ventura, J.; Araujo, J. P., 22, 2012; permission conveyed through Copyright Clearance Center, Inc

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Funding

This work was supported by Portuguese Fundação para a Ciência e Tecnologia (FCT) and Programa Operacional Regional Norte (Fundo Social Europeu) under the project SFRH/BD/148563/2019 and IF/01159/2015. This work was also financially supported by the FCT and Programa Operacional Competitividade e Internacionalização 2020 (Fundo Europeu de Desenvolvimento Regional) under the projects POCI-01-0141-FEDER-032527, PTDC/FIS-MAC/31302/2017, PTDC/CTM-CTM/28676/2017, PTDC/FIS-OTI/32257/2017, and Strategic Funding contract UIDB/04968/2020, from the Spanish Ministerio de Ciencia e Innovación under the project PID2020-117024GB-C42, and from European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 734801. This work has also made use of the Spanish ICTS Network MICRONANOFABS.

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All the authors contributed to the study conception and design. RM and CTS contributed to conceptualization and formal analysis; RM and MPP were involved in methodology; MPP performed magnetic simulations; CN and JPA did validation; JPA, MPP, and C.T.S. contributed to resources; RM was involved in writing original draft preparation; CS and MPP were involved in writing—review and editing; CTS and CN performed supervision; CTS contributed to project administration; JPA and CTS were involved in funding acquisition. All the authors have read and agreed to the published version of the manuscript.

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Correspondence to R. Magalhães.

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Magalhães, R., Proenca, M.P., Araújo, J.P. et al. Fabrication of FePt nanowires through pulsed electrodeposition into nanoporous alumina templates. Appl Nanosci 12, 3573–3584 (2022). https://doi.org/10.1007/s13204-022-02454-1

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  • DOI: https://doi.org/10.1007/s13204-022-02454-1

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