A Magnetic Thermometer for High-Resolution 10 mK Scale Thermometry

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX10CD64P
Agency Tracking Number: 095130
Amount: $99,999.00
Phase: Phase I
Program: SBIR
Awards Year: 2010
Solicitation Year: 2009
Solicitation Topic Code: S1.07
Solicitation Number: N/A
Small Business Information
STAR Cryoelectronics, LLC
25-A Bisbee Court, Santa Fe, NM, 87508-1338
DUNS: 071331768
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Robin Cantor
 Principal Investigator
 (505) 424-6454
 rcantor@starcryo.com
Business Contact
 Robin Cantor
Title: Business Official
Phone: (505) 424-6454
Email: rcantor@starcryo.com
Research Institution
N/A
Abstract
An innovative thin-film magnetic thermometer with integrated superconducting quantum interference device (SQUID) readout is described for fast, precision temperature measurements in the 10 mK range. The compact thermometer consists of a miniature DC SQUID susceptometer with a dilute paramagnetic alloy deposited in one of the two series-configured gradiometric SQUID pickup loops that form the SQUID inductance. Directly sensing the magnetic signal with the SQUID eliminates losses that would otherwise occur by transformer-coupling the signal to a remotely located SQUID, usually operating at a higher temperature and consequently with a higher noise floor. In addition, a novel superconducting flux concentrator deposited on top of the paramagnetic alloy homogenizes and concentrates the magnetic flux density in the paramagnet and reduces the inductance of the pickup coil, both of which improve the sensitivity and signal to noise ratio as compared with previous miniature susceptometer designs. The innovative magnetic thermometer design is expected to achive a temperature resolution well below 1 µK/Hz½.

* information listed above is at the time of submission.

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