Development of miniature DC SQUID devices for the detection of single atomic spin-flips

Author

Pakes, Chris I. ; Josephs-Franks, P.W. ; Reed, R.P. ; Corner, Stephen G. ; Colclough, Mark S.

Author_Institution

Centre for Quantum Comput. Technol., Melbourne Univ., Parkville, Vic., Australia

Volume

50

Issue

2

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

310

Lastpage

313

Abstract

We report progress toward a superconducting quantum interference device (SQUID)-based system capable of detecting a few 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 μm×3 μm, is capable of detecting 40 spins in a 1-Hz bandwidth. We address the task of depositing a sample, of nanoscale dimension, within the SQUID loop

Keywords

SQUID magnetometers; magnetic transitions; nanotechnology; niobium; particle traps; scanning tunnelling microscopy; spin dynamics; superconducting thin films; 1 Hz; 3 micron; Nb; SQUID loop dimension; flux sensitivity; loop size; miniature DC SQUID devices; nanoscale dimension; single atomic spin-flips; Bandwidth; Dielectric measurements; Extraterrestrial measurements; Magnetic materials; Niobium; Probes; Quantum computing; SQUIDs; Size measurement; Temperature sensors;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.918129

Filename

918129