Fabrication and Characterization of sub-100nm Pb SQUIDs for nanoscale SQUID-on-Tip Microscopy

ORAL

Abstract

Scanning nanoSQUID-on-tip (nSOT) microscopy is a highly sensitive probe of local magnetic field. Unlike traditional microSQUID microscopy and other nanoscale scanned probes, nSOTs provide noninvasive magnetic imaging at sub-100nm length scales while operating in ambient magnetic fields as large as several Tesla (Vasyukov et al. Nature Nano. 8:639-644). I will describe the process for fabricating high-sensitivity nSOTs on the tip of a pulled quartz pipette, including the construction of a home-built thermal evaporator for self-aligned, three-angle deposition of a superconducting Pb film at cryogenic temperatures. Using this instrument, and an associated 4.2K squid-array amplifier based characterization set-up, we achieve reliable production of nSOTs with effective diameter as small as 40nm and spin-sensitivity of approximately 3μB/√Hz that remain functional in magnetic fields over 1T.

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Presenters

  • Avi Shragai

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara

Authors

  • Avi Shragai

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara

  • Marec Serlin

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara

  • Charles Tschirhart

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara

  • Martin Huber

    Department of Physics, University of Colorado Denver, Physics, University of Colorado Denver

  • Andrea Young

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara, University of California - Santa Barbara, Univ of California - Santa Barbara, Department of Physics, University of California, Santa Barbara, Physics Department, University of California