2005, 2003, English, Thesis edition: Nanoscale Josephson Devices Bell, Chris

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Physical Description
  • 23227135 bytes, 834 bytes, 6107171 bytes, application/​zip, text/​plain, application/​pdf
  • Thesis
Published
  • 2005-06-10T15:53:49Z
  • 2003-12
Language
  • English

Edition details

Title
  • Nanoscale Josephson Devices
Author
  • Bell, Chris
Published
  • 2005-06-10T15:53:49Z
  • 2003-12
Physical Description
  • 23227135 bytes, 834 bytes, 6107171 bytes, application/​zip, text/​plain, application/​pdf
  • Thesis
Subjects
Notes
  • This thesis describes the development and applications of sub-micron current-perpendicular-toplanedevices fabricated by three-dimensional etching with a focused ion beam microscope. Thistechnique was applied to a range of materials, including the study of c-axis Josephson junctionsin the high temperature superconductor Tl2Ba2CaCu2O8, the fabrication of superconductingquantum interference devices with sub-micron loop areas, and GaN light emitting diodes. Themain body of research was carried out in the study of Nb based Josephson junctions workingat a temperature of 4.2 K. Junctions with normal metal, insulating and ferromagnetic barrierswere characterised, as well as the first metallic antiferromagnetic Josephson junctions usingγ-Fe50Mn50 as the barrier. ‘Pseudo-spin-valve’ Josephson junctions were also created using aCo/​Cu/​Fe20Ni80 barrier. In this case the relative orientation of the magnetic moments of theCo and Fe20Ni80 could be changed with an applied magnetic field. The magnetoresistance andcritical current of the device showed a strong correlation, implying a direct influence of themagnetic structure of the device on the critical current.
  • Materials Science and Metallurgy, University of Cambridge 2003
Language
  • English
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