The differential susceptibility of thin polycrystalline iron-nickel-films has been measured.From the results the structure constant, S , could be determined. The experiments gave the same field dependence for the susceptibility as was expected by former calculations. The values for 8, evaluated from the experiment, can be explained quantitatively by the mean crystallite diameter, the magnetocrystalline anisotropy, the magnetostriction constants, and the intrinsic stresses, if one uses the Doyle-Finnegan formula for the calculation. The measurements show quantitatively the existence of the intrinsic demagnetizing field, which has been predicted by micromagnetic calculations and which contributes to the whole effective field.Die differentielle Huszeptibilitat dunner Eisen-Kickel-Schichten wurde ermittelt und aus den MeBwerten auf die ,,Struktnrkonstante" S der Schichten geschlossen. Die Feldabhangigkeit der Suszeptibilitat stiinmt mit friiheren theoretischen Vorhersagen iiberein. Die experimentell ermittelte Struktnrkonstante l%Bt sich quantitativ aus der KristallitgroBe, den inneren Spannungen, den Magnetostriktionskonstanten und der Kristallenergie erklaren. Die Messungen stellen einen qaantitativen Kachweis des mikromagnetisch berechneten inneren entmagnetisierenden Feldes dar, ivelches zum gesamten Effektivfeld beitragt .
The magnetooptical Faraday rotation of a guided He-Ne laser beam in index-gradient fibers was measured. The proportionality between the rotation of the polarization vector and the length of the light path in an applied homogeneous longitudinal magnetic field is disturbed. The measuring results can be explained by means of a theoretical model combining the Faraday effect with birefringence.
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