Nano-SQUIDs based on niobium Dayem bridge for nanoscale applications (Articolo in rivista)

Type
Label
  • Nano-SQUIDs based on niobium Dayem bridge for nanoscale applications (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/234/4/042010 (literal)
Alternative label
  • Granata C., Vettoliere A. , Walke P. , Esposito E. , Nappi C. , Silvestrini P. , Ruggiero B. and Russo M. (2010)
    Nano-SQUIDs based on niobium Dayem bridge for nanoscale applications
    in Journal of physics. Conference series (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Granata C., Vettoliere A. , Walke P. , Esposito E. , Nappi C. , Silvestrini P. , Ruggiero B. and Russo M. (literal)
Pagina inizio
  • 042010 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 234 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di cibernetica \"Edoardo Caianiello\" (literal)
Titolo
  • Nano-SQUIDs based on niobium Dayem bridge for nanoscale applications (literal)
Abstract
  • We report on the design, the fabrication and the performance of an integrated magnetic nano-sensor based on niobium dc-SQUID (Superconducting QUantum Interference Device) for nanoscale applications is presented. The nano-sensors are based on nanometric niobium constrictions (Dayem bridges) inserted in a square loop having a side length of 200 nm. Measurements of voltage-flux characteristic, flux to voltage transfer factor and noise performances are reported. In small signal mode, the sensors have shown a magnetic flux noise spectral density of 1.5 ?? 0/Hz 1/2 corresponding to a spin sensitivity in unit of Bohr magneton of 60 spin/Hz 1/2. Supercurrent decay measurements of these devices are also reported. Such measurements provide useful information for applications which employ the SQUID as a trigger where the sensor works on the zero voltage state. The experimental data, have shown an intrinsic current fluctuation less than 0.2% of the critical current at liquid helium temperature, corresponding to an intrinsic sensor magnetic flux resolution of a few m? 0. In view of the nano-SQUID employments in the detection of small spin populations, the authors calculated the spin sensitivity and the magnetic response relative to the single spin, as a function of its position within the SQUID hole. The results show that the SQUID response depends strongly on the spin position. © 2010 IOP Publishing Ltd. (literal)
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