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13 - Electrical and Electronic Engineering, Metallurgy and Materials
University College London
Noise Performance of Niobium Nano-SQUIDs in Applied Magnetic Fields
The performance of nanoSQUIDs (ultrasensitive magnetic flux sensors) is usually greatly compromised in high magnetic fields. We demonstrate our new designs have record flux/spin sensitivity at 4.2 K, approaching the requirements for single spin detection in e.g. nanomagnetism, spintronics and QIP. More critically we demonstrate this is maintained in parallel fields up to 1T, sufficiently large for most applications where the samples (magnetic materials/molecules/nanoparticles) need to be magnetised. The work led to new collaboration with PTB Berlin (Dr T. Schurig) for design of readout electronics and an invited talk at the leading conference in Applied Superconductivity (ASC 2012, Portland, US).
