A simple and sensitive apparatus for measuring the magnetization of small ferrite samples.
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.
Peuzin
J C
JC
Commissariat 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.
Girod
S
S
Rebreyend
J C
JC