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Characterization of 3D superconducting WC nanotubes fabricated by a novel Focused Ion-Beam Induced Deposition direct-write method

AuthorsIbarra, Alfonso; Córdoba, R.; Mailly, Dominique; Teresa, José María de
Keywords3D nanoprinting
Electron tomography
He-FIB fabrication
Hollow nanowires
TEM characterization
Tungsten carbide
Issue Date2019
CitationMicroscopy at the Frontiers of Science Congress (2019)
AbstractSuperconductors allow the transport of electricity without energy losses. This property, makes possible applications such as energy generators and storage devices, highfrequency filters and switches and magnetic sensors. Their miniaturization, reaching the nanoscale in the range of their superconducting coherence length, makes appear novel physical phenomena and can optimize their functionality. Moreover, the design of three-dimensional nanosuperconductors allows to conceive new schemes for such applications. In this contribution, we introduce a novel template-free nano-lithography method to fabricate in a single-step nano-elements by means of focused ion beam induced deposition (FIBID) with arbitrary shape and in the three dimensions, opening fascinating novel routes in the fields of material science and nanotechnology. Particularly, 3D superconducting crystalline WC nanotubes with controllable inner and outer diameters have been fabricated. Their magnetotransport properties exhibit 1.5 times higher superconducting critical temperatures (6.4 K) as well as 1.5 times higher upper critical magnetic fields ( 14 T) when compared to nanowires grown by the analogous technique Ga+ FIBID. Transmission electron microscopy studies have been carried out in order to know the crystallographic structure and relate it with the superconductivity properties. Moreover, the relationship between the composition into the wire (growth parameters) and the structure has been analysed. On the other hand, the resulting hollow nanowire geometry produced by the highly focused He+ beam, which confers them a high potential for applications in a broad range of fields, has been studied by electron tomography technique.
DescriptionResumen del póster presentado al Microscopy at the Frontiers of Science Congress Series (MFS), celebrado en el Parque de las Ciencias de Granada (España) del 11 al 13 de septiembre de 2019.
Appears in Collections:(ICMA) Comunicaciones congresos
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