Title :
Influence of in-plane anisotropy and eddy currents on the frequency spectra of the complex permeability of amorphous CoZr thin films
Author :
Fessant, A. ; Gieraltowski, J. ; Loaec, J. ; Le Gall, H. ; Rakii, A.
Author_Institution :
Univ. de Bretagne Occidentale, Brest, France
fDate :
1/1/1993 12:00:00 AM
Abstract :
A broadband method for measuring the complex permeability of magnetic thin films, based on the measurement of the S parameters of a stripline and on the numerical solution of Laplace´s equation according to the quasi-TEM (transverse electromagnetic) propagation mode, is presented. The method is applied to determine the permeability spectra of CoZr amorphous thin films in the 3 MHz to 3 GHz frequency range. The influence of the exciting magnetic field orientation with respect to the direction of the easy axis is studied. The influence of eddy current on the cutoff frequency observed for permeability spectra is analyzed
Keywords :
cobalt alloys; eddy currents; ferromagnetic properties of substances; magnetic anisotropy; magnetic permeability; magnetic properties of amorphous substances; magnetic thin films; zirconium alloys; 3 MHz to 3 GHz; Laplace´s equation; amorphous CoZr thin films; broadband method; complex permeability; cutoff frequency; eddy currents; exciting magnetic field orientation; frequency spectra; in-plane anisotropy; magnetic thin films; quasi TEM propagation mode; stripline S-parameters; Amorphous materials; Anisotropic magnetoresistance; Eddy currents; Electromagnetic measurements; Electromagnetic propagation; Frequency; Laplace equations; Magnetic films; Permeability measurement; Stripline;
Journal_Title :
Magnetics, IEEE Transactions on
