Self-aligned nanoscale SQUID on a tip

Abstract

A nanometer-sized superconducting quantum interference device (nanoSQUID) is fabricated on the apex of a sharp quartz tip and integrated into a scanning SQUID microscope. A simple self-aligned fabrication method results in nanoSQUIDs with diameters down to 100 nm with no lithographic processing. An aluminum nanoSQUID with an effective area of 0.034 $\mu$m${}^2$ displays flux sensitivity of 1.8$\cdot 10^{-6}$ ${\Phi }_0/{\mathrm{Hz}}^{1/2}andoperatesinfieldsashighas0.6T.Withprojectedspinsensitivityof65$μ_B/\mathrm{Hz}^{1/2}$ and high bandwidth, the SQUID on a tip is a highly promising probe for nanoscale magnetic imaging and spectroscopy.

14 manuscript pages, 5 figures

References in corpus (1)

• A Terraced Scanning Superconducting Quantum Interference Device Susceptometer with Sub-Micron Pickup Loops

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