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Published on: July 20, 2022
A simple and sensitive apparatus for measuring the magnetization of small ferrite samples
J C Peuzin1, S Girod, J C Rebreyend
1Commissariat a L'Energic Atomique, Centre d'Etudes Nucleaires de Grenoble, Laboratoire d'Electronique et de Technologie de L'Information, B.P. 85 Centre de Tri, 38041 Grenoble Cedex, France.
Abstract:
This paper describes an apparatus which allows the routine measurement of the magnetization of small ferrite samples using the well-known extraction method. In contrast to the classical extraction method, however, this device makes use of a high-permeability magnetic circuit that serves both to apply the bias field and to collect the sample flux. This design, together with a signal sampling technique, allows an unusually high sensitivity for this type of method (magnetic moment resolution is 5 x 10(-5) microem). The apparatus is described in detail and a brief theory of its function is given. Finally, the device usefulness is illustrated by some measurement results referring to Ga YIG spheres that are used in ferrimagnetic resonators.
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