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Fe0.7Co0.3B films with a thickness of 100 nm were prepared by composition gradient sputtering on (100) single-crystal Si substrates. A considerable increase in uniaxial magnetic anisotropy fields Hk from 180.6 to 295.5 Oe was achieved by the gradient compositioninduced stress. Although the saturation magnetization 4\pi MS slightly decreases from 16.3 to 13.5 kG with the increase in the B concentration, the ferromagnetic frequency f\mathrm FMR increases from 4.82 to 5.62 GHz due to the domination of Hk . The X-ray absorption spectra revealed that the decrease in the 4\pi MS with B concentration can be attributed to the hybridization between Fe and B atoms. [ABSTRACT FROM AUTHOR]

A double current method is presented for absolute measurements of the current dependence (power variation) of dc resistors. Based on the resistance measurement principle of a direct current comparator (DCC), and adding another DCC-based extender with a turn ratio 1:1, the testing current in resistors to be tested is accurately doubled. Through three comparative measurements with two reference standard resistors connected in series as Kelvin resistive bridge inner arms, the change of resistance caused by doubling the currents is measured. Cyclically done, absolute measurement of current or power factor is realized. Examples of the current dependence of some commercial low-temperature coefficient 1 \Omega standard resistors are given using the presented method and their results are analyzed. [ABSTRACT FROM PUBLISHER]

This paper describes the calculation of the magnetic shielding effectiveness in current comparators, considering the air gap which is inevitable for the magnetic shielding. The method was verified to be accurate and effective by finite-element method analysis. Experiments were implemented to investigate the effect of the air gap as well. [ABSTRACT FROM PUBLISHER]