Related Experiment Video
Updated: Apr 25, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Magnetic flux noise in dc SQUIDs: temperature and geometry dependence
S M Anton1, J S Birenbaum1, S R O'Kelley1
1Department of Physics, University of California, Berkeley, California 94720-7300, USA.
Abstract:
The spectral density S(Φ)(f) = A(2)/(f/1 Hz)(α) of magnetic flux noise in ten dc superconducting quantum interference devices (SQUIDs) with systematically varied geometries shows that α increases as the temperature is lowered; in so doing, each spectrum pivots about a nearly constant frequency. The mean-square flux noise, inferred by integrating the power spectra, grows rapidly with temperature and at a given temperature is approximately independent of the outer dimension of a given SQUID. These results are incompatible with a model based on the random reversal of independent, surface spins.
Related Concept Videos
Magnetic Fields
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Field Due To A Thin Straight Wire
Magnetic Flux
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Field Of A Current Loop
Magnetic Field Due to Two Straight Wires
Torque On A Current Loop In A Magnetic Field
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

