Amit Finkler

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

• Gebundenes Buch

Produktbeschreibung

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.

Produktdetails

• Springer Theses
• Verlag: Springer / Springer Berlin Heidelberg / Springer, Berlin
• Artikelnr. des Verlages: 86071114, 978-3-642-29392-4
• 2012
• Seitenzahl: 76
• Erscheinungstermin: 18. Mai 2012
• Englisch
• Abmessung: 241mm x 160mm x 9mm
• Gewicht: 262g
• ISBN-13: 9783642293924
• ISBN-10: 3642293921
• Artikelnr.: 35244214

Inhaltsangabe

Introduction.- Scientific Background.- Open Questions.- Goal.- Methods.- SQUID-on-tip Fabrication.- Tuning Fork Assembly.- Scanning SQUID Microscopy.- Fabrication of Samples.- Results.- SQUID-on-tip Characterization.- Imaging.- Discussion.- Appendices.