AC susceptibility apparatus for use with a closed-cycle helium refrigerator
- Resource Type
- Authors
- Amitabh Das; Arindom Banerjee; Abhijit Mitra; Amber Rastogi; A. K. Majumdar; Manoj Kumar
- Source
- Journal of Physics E: Scientific Instruments. 22:230-233
- Subject
- Frequency response
Materials science
Liquid helium
Nuclear engineering
General Engineering
General Physics and Astronomy
Helium-3 refrigerator
Inductor
Magnetic susceptibility
law.invention
Coolant
Inductance
Nuclear magnetic resonance
law
Operational amplifier
General Materials Science
Instrumentation
- Language
- ISSN
- 0022-3735
A low cost mutual inductance bridge is constructed using only operational amplifiers. The bridge is suitable for measurement of AC magnetic susceptibility for a wide variety of magnetic materials. The measurement is done using a closed-cycle helium refrigerator from 16 to 300 K where the minimum detectable moment is 6*10-10 A m2 (6*10-7 EMU). This value could be reduced to 1*10-10 A m2 (1*10-7 EMU) if liquid helium is used as a coolant. The frequency response of this bridge is better than any other conventional one as no inductor is used in the electronic circuitry.