Title :
Portable DC SQUID based magnetic susceptibility meter
Author :
Khanin, V.V. ; Sotnikova, J.N. ; Slobodchikov, V.Y. ; Matlashov, A.N.
Author_Institution :
Moscow State Univ., Russia
fDate :
6/1/1995 12:00:00 AM
Abstract :
The device is designed as a top-loading system for operation in a storage helium dewar with a 1 1/4" dia neck. Sample temperature is regulated in the range of 4.2-300 K using gaseous helium fed from a helium bath. The sample diameter is up to 4.0 mm, the maximum magnetizing field 0.18 T, the magnetic moment resolution 5/spl times/10/sup -12/ A/spl times/m/sup 2/. The high sensitivity of the instrument makes it possible to investigate the magnetic susceptibility of 1 mm/spl times/1 mm HTc thin films as a function of temperature in a transverse magnetic field of about 10/sup -3/ T. The provisions for measuring the magnetizing field with the help of a Hall sensor enable samples to be cooled down in the fields below 10/sup -5/ T to measure the Meisner effect.<>
Keywords :
Meissner effect; SQUID magnetometers; high-temperature superconductors; magnetic susceptibility; portable instruments; superconducting thin films; 1E-5 to 0.18 T; 4.0 mm; 4.2 to 300 K; HTc thin films; Hall sensor; He; Meisner effect; gaseous helium; helium bath; magnetic moment resolution; magnetizing field; portable DC SQUID based magnetic susceptibility meter; sensitivity; storage helium dewar; top-loading system; Magnetic field measurement; Magnetic moments; Magnetic sensors; Magnetic susceptibility; Neck; SQUIDs; Temperature distribution; Temperature sensors; Thin film sensors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
