Electrical transport and pinning properties of Nb thin films patterned with focused ion beam-milled washboard nanostructures

A careful analysis of the magneto-transport properties of epitaxial nanostructured Nb thin films in the normal and the mixed state is performed. The nanopatterns were prepared by focused ion beam (FIB) milling. They prov
A careful analysis of the magneto-transport properties of epitaxial nanostructured Nb thin films in the normal and the mixed state is performed. The nanopatterns were prepared by focused ion beam (FIB) milling. They provide a washboard-like pinning potential landscape for vortices in the mixed state and simultaneously cause a resistivity anisotropy in the normal state. Two matching magnetic fields for the vortex lattice with the underlying nanostructures have been observed. By applying these fields, the most likely pinning sites along which the flux lines move through the samples have been selected. By this, either the background isotropic pinning of the pristine film or the enhanced isotropic pinning originating from the nanoprocessing have been probed. Via an Arrhenius analysis of the resistivity data the pinning activation energies for three vortex lattice parameters have been quantified. The changes in the electrical transport and the pinning properties have been correlated with the results of the microstructural and topographical characterization of the FIB-patterned samples. Accordingly, along with the surface processing, FIB milling has been found to alter the material composition and the degree of disorder in as-grown films. The obtained results provide further insight into the pinning mechanisms at work in FIB-nanopatterned superconductors, e.g. for fluxonic applications.
…show moreshow less

Download full text files

Export metadata

  • Export Bibtex
  • Export RIS

Additional Services

    Share in Twitter Search Google Scholar
Metadaten
Author:Olesandr V. Dobrovolskiy, Evgeniya Begun, Michael Huth, Viktor A. Shklovskij
URN:urn:nbn:de:hebis:30:3-277282
DOI:http://dx.doi.org/10.1088/1367-2630/14/11/113027
ISSN:1367-2630
Parent Title (English):New Journal of Physics
Publisher:Dt. Physikalische Ges.
Place of publication:Bad Honnef
Document Type:Article
Language:English
Date of Publication (online):2012/11/22
Date of first Publication:2012/11/22
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2012/12/13
Volume:14
Issue:113027
Pagenumber:27
First Page:1
Last Page:27
Note:
Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:72.20.My Galvanomagnetic and other magnetotransport effects
74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
74.25.Op Mixed states, critical fields, and surface sheaths
74.25.Qt Vortex lattices, flux pinning, flux creep
74.78.Na Mesoscopic and nanoscale systems
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung-Keine kommerzielle Nutzung-Weitergabe unter gleichen Bedingungen

$Rev: 11761 $