X-band FMR measurements: establishing of relations between the complex permeability and reflection factor of ferromagnetic amorphous conductors

(Received 4 December 1992, accepted 13 July 1993)

Abstract
A new calculation for the determination, at ultra-high frequencies, of the complex permeability variations of ferromagnetic amorphous conductors has been developed and gives the possibility of using directly the measurements obtained by ferromagnetic resonance. The equations set out and reported combine surface impedance relation, boundary conditions and variation studies of the magnetic field dependence of the reflection factor in the case of ultra-high frequencies. The measurements at 9 GHz have been led with an X-band three-wave interferometer of great accuracy with based-cobalt (Vitrovac) and based-iron-boron (Metglas) amorphous conductor samples.