SQUID magnetometer based on Grooved Dayem nanobridges and a flux
  transformer

Trabaldo, Edoardo; Pfeiffer, Christoph; Andersson, Eric; Arpaia, Riccardo; Kalaboukhov, Alexei; Winkler, Dag; Lombardi, Floriana; Bauch, Thilo

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SQUID magnetometer based on Grooved Dayem nanobridges and a flux transformer

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Author(s): Edoardo Trabaldo , Christoph Pfeiffer , Eric Andersson , Riccardo Arpaia , Alexei Kalaboukhov , Dag Winkler , Floriana Lombardi , Thilo Bauch

Publication date Created: 26 August 2019

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Abstract

We report noise measurements performed on a SQUID magnetometer implementing Grooved Dayem nanobridge of YBCO as weak-links. The SQUID shows magnetic flux noise as low as 10 $\mu \Phi_0$/Hz$^{0.5}$. The magnetometer is realized by coupling the SQUID to a flux transformer with a two-level coupling scheme using a flip-chip approach. This improves the effective area of the SQUID and result in a magnetic field noise of 50 fT/Hz$^{0.5}$ at T=77 K.