Modification of domain-wall propagation in Co nanowires via Ga + irradiation

Luis Serrano-Ramón, Amalio Fernández-Pacheco, Manuel Ricardo Ibarra, Dorothée Petit, Russell P. Cowburn, Tolek Tyliszczak and José Teresa ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 3, 1-6

Abstract: The propagation of domain walls in polycrystalline Co nanowires grown by focused-electron-beam-induced deposition is explored. We have found that Ga + irradiation via focused ion beam is a suitable method to modify the propagation field of domain walls in magnetic conduits. Magneto-optical Kerr effect measurements show that global Ga + irradiation of the nanowires increases the domain-wall propagation field. Additionally, we have observed by means of scanning transmission X-ray microscopy that it is possible to produce substantial domain-wall pinning via local Ga + irradiation of a narrow region of the nanowire. In both cases, Ga + doses of the order of 10 16 ions/cm 2 are required to produce such effects. These results pave the way for the controlled manipulation of domain walls in Co nanowires via Ga + irradiation. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30926-5

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