Article (Scientific journals)
A simple torque magnetometer for magnetic moment measurement of large samples: Application to permanent magnets and bulk superconductors
Brialmont, Sébastien; Fagnard, Jean-François; Vanderbemden, Philippe
2019In Review of Scientific Instruments
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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in S. Brialmont, J.F. Fagnard, P. Vanderbemden, Rev. Sci. Instrum. 90, 085101 (2019) and may be found at https://doi.org/10.1063/1.5111399.


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Keywords :
Magnetometry; Torque magnetometer; Bulk superconductors; Applied superconductivity; Superconducting tapes; Magnetic moment; Coated conductors
Abstract :
[en] The development of large size magnetic materials requires nondestructive measurement techniques to characterize their magnetic moment. In this work, we report the design and construction of a torque magnetometer able to accommodate sizable magnetic samples (>1 cm³) both at room temperature and cryogenic temperature. This device has an intermediate sensitivity between miniature torque magnetometers designed to work at cryogenic temperature and industrial torquemeters poorly adapted to extreme conditions. We show that torque sensing in the range 0.001 - 100 Nm can be achieved with piezoresistive metallic strain gages cemented on a cylindrical aluminum shaft with external temperature control. An absolute calibration of the device, carried out with a coil fed by a DC current, shows that magnetic moment down to 0.005 A m² can be measured by this technique. The magnetometer is used to characterize a Nd-Fe-B permanent magnet and a permanently magnetized bulk, large grain superconductor at liquid nitrogen temperature (77 K). Results are in excellent agreement with data obtained with a flux extraction magnetometer for large samples. The device is able to measure magnetic moments in excess of 1.5 A m², i.e., two orders of magnitude above the maximum magnetic moment of commercial magnetometers. The sample can be inserted in the air-gap of an electromagnet to measure the decrease in magnetic moment in the presence of a transverse applied field. The device was used to characterize the magnetic moment of "quasibulk" superconductors made of stacked coated conductor tapes (12 mm width) in such "crossed field" conditions.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Brialmont, Sébastien  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Fagnard, Jean-François  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Applied and Computational Electromagnetics (ACE)
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
A simple torque magnetometer for magnetic moment measurement of large samples: Application to permanent magnets and bulk superconductors
Alternative titles :
[fr] Un simple magnétomètre à couple pour la mesure du moment magnétique d'échantillons de grande taille: Application aux aimants permanents ainsi qu'aux supraconducteurs massifs
Publication date :
02 August 2019
Journal title :
Review of Scientific Instruments
ISSN :
0034-6748
eISSN :
1089-7623
Publisher :
American Institute of Physics, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 22 August 2019

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