Effect of Local Anisotropy Fluctuation on the Permeability of Multilayered Co-Zr-Mo-Ni Amorphous Films
To evaluate the magnetic inhomogeneities normally represented as magnetic skew and ripple, a systematic experimental investigation was carried out using the dynamic differential susceptibility measurement proposed by H. Hoffmann for multilayered CO79Zr10Mo9Ni2 amorphous films. The influence of the local magnetic anisotropy on the effective permeability μeff of the films is broadly discussed in connection with the magnetic skew and ripple. The magnitude of the μeff in low frequency regions less than 1 MHz is strongly dependent on the degree of the long period fluctuation of the local magnetization direction (skew) and the magnitude of the anisotropy field. To realize excellent soft magnetic properties in films at high frequencies (10 MHz), it is suggested that the alleviation of magnetic inhomogeneities due to the short-period fluctuation of the local magnetization direction is important.
Investigation of the Structure of Ferromagnetic Films by Means of the Differential Susceptibility
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 S, 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 Suszeptibilitat dunner Eisen–Nickel-Schichten wurde ermittelt und aus den Meswerten auf die „Strukturkonstante” S der Schichten geschlossen. Die Feldabhangigkeit der Suszeptibilitat stimmt mit fruheren theoretischen Vorhersagen uberein. Die experimentell ermittelte Strukturkonstante last sich quantitative aus der Kristallitgrose, den inneren Spannungen, den Magnetostriktionskonstanten und der Kristallitenergie erklaren. Die Messungen stellen einen quantitativen Nachweis des mikromagnetisch berechneten inneren entmagnetisierenden Feldes dar, welches zum gesamten Effektivfeld beitragt.
Serum Profiles of Luteinizing Hormone, Oestradiol and Cholesterol and Ovarian Functions in Layer Poultry Birds (Gallus domesticus) Fed Diets Containing Furazolidone
This study was carried out to assess the serum profiles of luteinizing hormone (LH), oestradiol, cholesterol and ovarian functions in layer poultry birds (Rhode Island Red;Gallus domesticus) fed a diet containing various concentrations of furazolidone (FZ). A total of 40 birds were randomly assigned to receive FZ 0, 200, 400 or 800 mg/kg feed (ppm) daily during the pre-laying age, i.e. 13–18 weeks (for 5 weeks). Blood samples were collected at weekly intervals. Concentrations of LH and oestradiol in serum were estimated at alternate weeks using radioimmunoassays. Serum cholesterol levels were analysed by an enzymatic calorimetric method. Furazolidone administration was terminated at the 18th week of age. The birds were sacrificed at 22nd week of age and ovarian tissues were processed for morphometric studies. Serum LH, oestradiol and cholesterol levels were affected by age (p<0.001) and FZ dose (p<0.001). Serum LH and oestradiol levels were lower (p<0.05) in birds receiving FZ 800 mg/kg feed daily compared with the controls, whereas serum cholesterol profiles were lower (p<0.05) in all FZ-administered groups than in the control group. The mean weight of ovaries having no yolky follicles observed in the group receiving FZ 400 or 800 mg/kg feed per day was reduced (p<0.05) compared with the control group. Dosing FZ at 800 mg/kg feed per day reduced (p<0.05) the mean volume of ovaries having no yolky follicles compared with the control group. In birds receiving FZ 800 mg/kg feed per day, the mean length of the oviduct was reduced (p<0.05) as compared with the control group. Morphometric studies revealed that the mean number of oocytes with diameter in the range 401–800 μm decreased (p<0.05) in birds fed FZ 400 or 800 mg/kg feed per day. Initial egg production was affected by age (p<0.001) and dose (p<0.001) of FZ. The mean number of eggs laid by different groups revealed that egg production was reduced (p<0.05) in birds receiving FZ 800 mg/kg feed per day as compared with the controls. The present data suggest that FZ causes suppression in serum profiles of LH, oestradiol, cholesterol and ovarian functions in Rhode Island Red layer poultry birds. Therefore, great care must be taken with use of FZ in layer poultry birds (Gallus domesticus) with regard to dosage and duration of administration.