Nickel and iron standards for the calibration of the measurement of magnetic moment
A reference standard of known value of magnetic moment is an indispensable tool for the absolute calibration of those measurement devices, such as fluxmeters or magnetometers, which only provide a relative measurement, even though in some cases, this has great precision. This work has led to the preparation of 200 magnetic moment reference standards: - 50 cylinders of pure iron, 50 of pure nickel, for the calibration of hysteresis cycle tracers and fluxmeters; - 50 spheres of pure iron, 50 of pure nickel, for the calibration of vibrating magnetometers. Within each of the four lots 10 specimens (primary references) have been measured at four different temperatures (4K, 77K, 296K, 423K), the external excitation magnetic field being varied in the range of 4 to 25 x 1.0 E5 A/m. The other specimens were not measured directly; the active mass was measured and the magnetic moment as a function of the magnetic field H was calculated from the mean value of the 10 primary references. In the case of the nickel cylinders the moment per gram measured at saturation is in agreement within better than 0.2% with that of Danan et al. (J.Appl.Phys. 39, 2 (1968), p.669). In the case of the iron spheres the agreement is within 0.1%.
Bibliographic Reference: EUR 13578 FR (1991) 53 pp., MF, ECU 4
Record Number: 199110596 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr