Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors (Springer Theses)

Finkler, Amit

ISBN 10: 3642293921 / ISBN 13: 9783642293924

Editore: Springer, 2012

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Dati bibliografici

• Titolo: Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors (Springer Theses)
• Editore: Springer
• Data di pubblicazione: 2012
• Lingua: Inglese
• ISBN 10: 3642293921
• ISBN 13: 9783642293924
• Rilegatura: Rilegato
• Condizione: New

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Riassunto

Common methods of local magnetic imaging display either a high spatial resolution and relatively poor field sensitivity (MFM, Lorentz microscopy), or a relatively high field sensitivity but limited spatial resolution (scanning SQUID microscopy). Since the magnetic field of a nanoparticle or nanostructure decays rapidly with distance from the structure, the achievable spatial resolution is ultimately limited by the probe-sample separation. This thesis presents a novel method for fabricating the smallest superconducting quantum interference device (SQUID) that resides on the apex of a very sharp tip. The nanoSQUID-on-tip displays a characteristic size down to 100 nm and a field sensitivity of 10^-3 Gauss/Hz^(1/2). A scanning SQUID microsope was constructed by gluing the nanoSQUID-on-tip to a quartz tuning-fork. This enabled the nanoSQUID to be scanned within nanometers of the sample surface, providing simultaneous images of sample topography and the magnetic field distribution. This microscope represents a significant improvement over the existing scanning SQUID techniques and is expected to be able to image the spin of a single electron.