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Download Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors

Download Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors

Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors. Amit Finkler

Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors
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Author: Amit Finkler
Page Count: 76 pages
Published Date: 18 May 2012
Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Publication Country: Berlin, Germany
Language: Englishhttps://d1w7fb2mkkr3kw.cloudfront.net/assets/images/book/large/9783/6424/9783642431524.jpg
ISBN: 9783642293924
Download Link: Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors
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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.

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