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Magnetization reversal in individual cobalt micro- and nanowires grown by focused-electron-beam-induced-deposition

Fernandez-Pacheco, A., De Teresa, J. M., Szkudlarek, A., Cordoba, R., Ibarra, M. R., Petit, D., O'Brien, L., Zeng, H. T., Lewis, E. R., Read, Daniel ORCID: and Cowburn, R. P. 2009. Magnetization reversal in individual cobalt micro- and nanowires grown by focused-electron-beam-induced-deposition. Nanotechnology 20 (47) , 475704. 10.1088/0957-4484/20/47/475704

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We systematically study individual micro- and nanometric polycrystalline cobalt wires grown by focused-electron-beam-induced-deposition. The deposits were grown in a range of aspect ratios varying from 1 up to 26. The minimum lateral dimension of the nanowires was 150 nm, for a thickness of 40 nm. Atomic force microscopy images show beam-current-dependent profiles, associated with different regimes of deposition. The magnetization reversal of individual nanowires is studied by means of the spatially resolved magneto-optical Kerr effect. Abrupt switching is observed, with a systematic dependence on the wire's dimensions. This dependence of the coercive field is understood in magnetostatic terms, and agrees well with previous results on cobalt wires grown with different techniques. The influence of compositional gradients along the structural profile on the magnetic reversal is studied by using micromagnetic simulations. This work demonstrates the feasibility of using this technique to fabricate highly pure magnetic nanostructures, and highlights the advantages and disadvantages of the technique with respect to more conventional ones.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP
ISSN: 0957-4484
Last Modified: 18 Oct 2022 14:05

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