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Single spin sensitivity at 4.2 K with a nano-sized SQUID-on-tip

Speaker: 
Denis Vasyukov (Graphene Centre, NUS)
Date: 
Wed, 25/09/2013 - 11:00am to 12:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Host: 
Jens Martin
Event Type: 
Seminars

Abstract

Nanoscale SQUIDs with diameters as small as 46 nm were fabricated on the apex of a sharp tip. The nano-SQUIDs have an extremely low flux noise of 50 nF0/Hz^-1/2 and a spin sensitivity of down to 0.38 µB/ Hz^-1/2, which is almost two orders of magnitude better than previous devices. They can also operate over a wide range of magnetic fields, providing a sensitivity of 0.6 µB/Hz^-1/2 at 1 T. The unique geometry of our nano-SQUIDs makes them well suited to scanning probe microscopy, and we used the devices to image vortices in a type -II superconductor, spaced 120 nm apart, and to record magnetic fields due to alternating currents down to 50 nT

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