In a recent article, an alternating field-gradient magnetometer was described [P. J. Flanders, J. Appl. Phys. 63, 3940 (1988)]. For calibration of the system, a calculation was carried out. Here, the treatment of the extension rod of that system and the considerations concerning the piezoceramic are criticized.
D. Cabra, C. Gazza, A. Dobry, и T. Vekua. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)