Helium-Free Torque Magnetometer up to 10 kG at 1.5-300 K

Mitsuyuki TSUJI  Nariaki YAMAMOTO  Shin'ichiro NAKATA  Shuichi KAWAMATA  Takekazu ISHIDA  Satoru OKAYASU  Kiichi HOJOU  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.756-758
Publication Date: 2002/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Instruments and Coolers
torque magnetometer,  piezo resister,  1.5 K refrigerator,  LabVIEW,  calibration,  

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We have developed a new torque magnetometer on the basis of a 4-K refrigerator. The system temperature can be lowered down to 1.5 K by pumping liquefied helium from a top loading sample space. A piezoresistor bridge on a Si cantilever is used to detect torque acting on a sample. A transverse magnetic field is supplied by a variable-field permanent magnet up to 10 kG. We find that a sensitivity of our torque magnetometer is Δ τ 10-10 Nm.