Miniature SQUID susceptometer

Journal Article · Tue May 15 04:00:00 EDT 1984 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.94601· OSTI ID:6593050

Ketchen, M B; Kopley, T; Ling, H

We present a new dc superconducting quantum interference device (SQUID) configured as a susceptometer for the study of the magnetic properties of small (<10 ..mu..m) particles and thin-film samples. The SQUID consists of two series pick-up loops wound in opposite sense over a hole in the groundplane and connected to remotely located tunnel junctions by low inductance transmission lines. An integrated field coil with provision for balance allows application of a magnetic field of 0--30 G to a sample positioned in either pick-up loop. For an applied field of 5 G the device having an intrinsic energy sensitivity of approx.25 h is able to resolve the superconducting transition of a 5-..mu..m tin particle with a signal-to-noise ratio of approx.10/sup 6/.

• Research Organization: IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 6593050
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 44:10; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment &amp; Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FILMS
FLUXMETERS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MEASURING INSTRUMENTS
MEASURING METHODS
MICROWAVE EQUIPMENT
PARTICLES
PARTICULATES
PHYSICAL PROPERTIES
SENSITIVITY
SIGNAL-TO-NOISE RATIO
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
THIN FILMS
TUNNEL EFFECT