rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Fabrication and Characterization of Nanoscale Periodic Ferromagnetic Structures on Superconducting Thin Films
  name:
    name part: Bang, Wonbae
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Teizer, Winfried
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2015
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: This research investigates the transport properties of ferromagnetic nanostructures made by nickel or cobalt on superconducting thin films. The superconducting thin films were covered by an insulating layer, and the periodic ferromagnetic nanostructures were fabricated on top of the insulating layer. On separate superconducting thin films, periodic ferromagnetic nanostructures were embedded into the thin films. The photolithography method was used to make contact pads for a four-probe measurement. In order to fabricate the magnetic nanostructures, an Electron Beam Lithography (EBL) system was utilized. The nanoscale patterns were filled with ferromagnetic materials by using a thermal evaporating method or an electroplating technique. The superconducting properties were measured at low temperature (2.0 K<T<8.0 K) for low temperature superconductors and at high temperature (85.0 K<T<90.0 K) for high temperature superconductors with a Physical Property Measurement System (PPMS). Scanning Electron Microscopy (SEM) and an Atomic Force Microscopy (AFM) were used to characterize the nanoscale structures. Magnetic Force Microscopy (MFM) was also used to study their magnetic properties. Superconductivity and ferromagnetism seems mutually exclusive states, however the superconducting and the ferromagnetic states show new and exciting properties when the two states affect each other at the nanoscale: hysteresis and enhanced superconductivity. Both the ferromagnetic nanostructures on the superconducting thin films and the embedded ferromagnetic nanosized arrays in the superconducting thin films exhibited an enhanced critical current density and critical magnetic field. Both of the samples also showed hysteresis and a field matching effect by the artificial ferromagnetic nanostructures when an external magnetic field was applied. The superconducting thin films with the ferromagnetic nanostructures system may be useful for power cable and other low magnetic field applications. Th…
  note: by Wonbae Bang.
  note: "Major Subject: Physics"
  note: Includes vita.
  note: Doctor of Philosophy Texas A & M University 2015 http://hdl.handle.net/1969.1/155645
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major physics
  subject:
    topic: Ferromagnet-Superconductor Hybrids
  subject:
    topic: Vortex pinning
  subject:
    topic: Matching field
  identifier: http://hdl.handle.net/1969.1/155645
  record info:
    record content source: TXA
    record creation date: 161025
    record change date: 20170926150114.0
    record identifier: in00003735709
    language of cataloging:
      language term: eng