Soft Magnetic Properties of Fe-Ni-Nb Alloy Films
The relation between the soft magnetic properties and local anisotropy fluctuation measured by the dynamic differential susceptibility method in Fe-Ni-Nb alloy films was clarified and discussed in comparison with Fe-Si-Al alloy films. Fe-Ni-Nb alloy films with excellent soft magnetic properties, 5 MHz values of ¿eff = 6500 for 1000 Å thick films were obtained. For Fe-Si-Al alloy films, the magnitude of ¿eff = 6500 is proportional to 1/S2 (where S is a structure constant) and independent of the value of Hk, while for Fe-Ni-Nb alloy films, the value of S is about one-tenth of that in Fe-Si-Al alloy films, and the magnitude of ¿eff 6500 does not depend on S. Rather, this magnitude is dependent on the value of Hk, and is almost equal to 4¿Ms/Hk, obtained from a rotational magnetization model in a uniaxial single-domain particle.
Co-(Pr, Nd) 非晶質蒸着薄膜の磁気及び磁気光学特性
Co based amorphous binary alloy films. Co100-xRx (10≤x≤55, R=Pr, Nd) were prepared on glass substrates using the electron beam evaporation technique. From magnetic and magneto-optical viewpoints, systematic experimental investigations were carried out on these films. As a result, (i) the dependence of perpendicular magnetic anisotropy constant with the correction of 2πMs2, K⊥, on temperature and composition, and (ii) the dependence of polar Kerr rotatiom angle, θK, on wavelength, λ (0.4∼1.1μm) and composition were systematically clarified. A maximum value of K⊥ of about 6 × 106 erg/cm3 at 77 K was obtained for Co-Nd amorphous film with 25 at% Nd concentration. K⊥ decreases monotonically with increasing temperature and becomes zero around 400 K. This temperature at which K⊥ disappeared was nearly the same for all the films examined regardless of alloy composition. A maximum value of θK, 0.38 deg (λ=0.4μm) in the present amorphous films was obtained at about 11 at% Nd concentration. The peak at which the minimum value of θK is observed shifts from 0.46μm (Co) to 0.65μm (31 at% Pr, Nd) in wavelength with increasing Pr, Nd concentration. Change of the magneto-optical active transition induced by the existence of Pr and Nd atom was found to be remarkable around at 30 at% rare earth concentration.
Clinical chemical values and variations in Rasa Aragonesa ewes and lambs
Reference values of biochemical parameters in serum of Rasa Aragonesa ewes and their physiological variations were determined. Total proteins were 53.0–80.0 g/l, glucose 2.17–5.13 mmol/l, cholesterol 0.83–2.31 mmol/l, total bilirubin 1.85–6.49 μmol/l, urea 3.15–10.39 mmol/l, GGT 36–93 U/l (37°C), ALAT 11–33 U/l (37°C) and ASAT 71–209 U/l (37°C). Ewes were divided into three groups: A, 1- and 2-year-old ewes; B, ewes 3 and 4 years old; C, older ewes. Age had significant influence (P<0.05) on ASAT only during pregnancy, with higher levels for younger ewes. Blood parameters in lambs were determined at 5–10 d of life (nursing), 25 to 30 d of life receiving their mother's milk and 80–90 g of feed; and 45 to 50 d of life, weaned, receiving only solid feed. Serum urea and ALAT tended to increase with age, whereas total protein, globulins, cholesterol and GGT decreased with age. These values are of practical importance in the diagnosis of diseases and metabolic disorders in Rasa Aragonesa ewes and lambs under field conditions.