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.
K. Augustson. (2019)cite arxiv:1912.06422Comment: 12 pages, 8 figures, Proceedings for Stellar Magnetic Fields: A workshop in honour of the career and contributions of John Landstreet, July 8-11th, 2019 London, Ontario, Canada.