Development of high field SQUID magnetometer for magnetization studies up to 7 T and temperatures in the range from 4.2 to 300 K

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3519017· OSTI ID:22063627

Nagendran, R; Thirumurugan, N; Chinnasamy, N; Janawadkar, M P; Sundar, C S ^[1]

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1. Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102 (India)

We present the design, fabrication, integration, testing, and calibration of a high field superconducting quantum interference device (SQUID) magnetometer. The system is based on dc SQUID sensor with flux locked loop readout electronics. The design is modular and all the subsystems have been fabricated in the form of separate modules in order to simplify the assembly and for ease of maintenance. A novel feature of the system is that the current induced in the pickup loop is distributed as inputs to two different SQUID sensors with different strengths of coupling in order to improve the dynamic range of the system. The SQUID magnetometer has been calibrated with yttrium iron garnet (YIG) sphere as a standard reference material. The calibration factor was determined by fitting the measured flux profile of the YIG sphere to that expected for a point dipole. Gd{sub 2}O{sub 3} was also used as another reference material for the calibration and the effective magnetic moment of the Gd{sup 3+} could be evaluated from the temperature dependent magnetization measurements. The sensitivity of the system has been estimated to be about 10{sup -7} emu at low magnetic fields and about 10{sup -5} emu at high magnetic fields {approx}7 T.

• OSTI ID: 22063627
• Journal Information: Review of Scientific Instruments, Vol. 82, Issue 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
DESIGN
FERRITE GARNETS
GADOLINIUM IONS
GADOLINIUM OXIDES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC MOMENTS
MAGNETIZATION
MAGNETOMETERS
READOUT SYSTEMS
SENSITIVITY
SPHERES
SQUID DEVICES
TEMPERATURE DEPENDENCE
YTTRIUM COMPOUNDS