Preparation and Characteristics of Cloth Inductor
A cloth inductor consisting of mechanically interwoven amorphous ferromagnetic fibers and conducting fibers is described, and the inductor characteristics reported for various fiber lengths, diameters, and weaving patterns. The inductance L increases nearly in proportion to the fiber length, and in proportion to the second power of the amorphous fiber diameter and the second power of the number of conducting fiber turns per unit length, as expected. The leakage flux and total inductance also depend on the relative flux orientations of neighboring amorphous fibers.
Sputter deposition and read/Write characteristics of Ba-ferrite thin film disk
The nucleation mechanisms and the composition change in Ba ferrite films deposition by means of the Targets Facing Type of Sputtering system have been discussed in detail. In addition, an attempt to control their magnetic properties has been made and read/write characteristics of the films prepared on the disk substrates have been evaluated. The single phase Ba ferrite films composed of fine graines are deposited epitaxially on the c-axis well oriented ZnO layer even in the nucleation stage under a wide range of preparation conditions. Moreover, the film composition, the crystal structure and the magnetic properties depend strongly on oxygen partial pressure. The films sputtered from the targets of n=5 and 6 in the BaO.nFe203 system exhibit good crystallographic and magnetic properties under the wider range of sputtering conditions. The coercive force Hc can be decreased without increasing the critical temperature of c-axis orientation by substitution of In3+for Fe3+. Furthermore, the D50 increases and overwrite decreases with increase of In3+content. Consequently, high density perpendicular recording with D 50 of 88 kFRPI has been achieved by using a narrow gap (0.4 μm) ring head.
Simulation study of high power microwave generation by virtual cathode oscillation in coaxial vircator
Summary form only given, as follows. We have numerically simulated the high power microwave generation by virtual cathode oscillation in a coaxial vircator with 3 dimensional PIC code Magic. It is noted that the coaxial vircator has the advantage of an enhancement of power efficiency and gaining of narrow bandwidth frequency. The study is focused on the design of a diode structure for a coaxial vircator suitable for Chundoong IREB pulser (Max. 600 kV, 85 kA, 60 ns). It consists of a center annular cathode, a cylindrical meshed-anode and a reflector. The simulation results showed that the coaxial vircator can indeed be operated at the selected frequency with the narrow bandwidth and the microwave output power strongly depends on the position and geometry of the reflector. From this simulation results we expect that the maximum microwave output power will be obtained by the reflector of 4 cm in width and also 4 cm in distance away from the IREB, where the resonant frequency of microwave from coaxial vircator is simulated to be 6.577 GHz.