Title :
Sampling method to extend bandwidth of scanning SQUID microscopes
Author :
Matthews, J. ; Vlahacos, C.P. ; Kwon, S.P. ; Wellstood, F.C.
Author_Institution :
Coll. Park, Univ. of Maryland, College Park, MD, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
We present preliminary results on the development of a 4.2 K scanning SQUID microscope with a bandwidth in the GHz range. We have overcome the bandwidth limitations of traditional scanning SQUID microscopes, which use a flux-locked loop, by using a hysteretic SQUID and a pulsed sampling technique. We describe the overall design and operation of our measurement system, and present high-speed measurement results.
Keywords :
SQUID magnetometers; magnetic fields; microscopes; 4.2 K; GHz range bandwidth; bandwidth extension; bandwidth limitations; hysteretic SQUID; pulsed sampling technique; scanning SQUID microscopes; Bandwidth; Frequency; Hysteresis; Image sampling; Magnetic fields; Microscopy; Pulse amplifiers; SQUIDs; Sampling methods; Voltage; High frequency; NDE; SQUID; microscopy;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.850003
