Speaker: Denis Vasyukov
Affiliation: Graphene Centre, NUS
Abstract Details: 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 nTClick HERE for directions

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