Title :
Miniature DC SQUID devices for the detection of single atomic spin-flips: scaling of flux sensitivity with device dimension
Author :
Pakes, C.I. ; Josephs-Franks, P.W. ; Reed, R.P.
Author_Institution :
Nat. Phys. Lab., Teddington, UK
Abstract :
We report progress towards a SQUID based system capable of detecting single atomic spin-flips. The scaling of the flux sensitivity with SQUID loop dimension of miniature niobium DC SQUID devices is examined and shown experimentally to vary as predicted. Our smallest device, with loop size 3 /spl mu/m/spl times/3 /spl mu/m, is capable of detecting a few spins in a 1 Hz bandwidth.
Keywords :
SQUID magnetometers; frequency standards; magnetic field measurement; magnetic resonance; superconducting device noise; 1 Hz; 3 micron; I-V characteristics; SQUID loop dimension; critical current density; device dimension; flux noise density; flux sensitivity scaling; magnetic transitions; miniature DC SQUID devices; near quantum limit operation; single atomic spin-flips detection; spin sensitivity; Amplitude modulation; Inductance; Magnetic devices; Magnetic field measurement; Magnetic flux; Magnetic shielding; Niobium; SQUIDs; Size measurement; Temperature sensors;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.850965
