Co1-xFex films with various compositions, x, are prepared by DC sputtering using a “Composite Target” composed of segments of various shapes (square, annular, multipleholed and fan-shaped). The thickness and compositional distributions for each of the films were determined from experiments by using the stylus step technique and EPMA method, respectively. The difference in distribution profiles for the thickness and composition of the films due to each geometrical arrangement of the segments are experimentally clarified. A model is proposed in order to calculate the distribution profiles of the thickness and composition of the films sputtered from each “Composite Target”. Based on this model, a theoretical calculation is attempted. By comparing the calculated results with the experimental ones, the change in the deposition rate of each segment for each geometrical arrangement of the target is quantitatively evaluated. It is found that each geometrical arrangement is uniquely characterized.
An apparatus for scanning-laser annealing with a CW CO2 laser was designed and constructed. Scanning-laser annealing applied to amorphous V-Si sputtered films caused a structural change to the A 15 V3Si phase with a Tc onset at 15 K. Superconducting regions in the annealed films were examined by dividing the films into several strips using a phato-etching technique. The results are discussed in connection with the temperature distribution in the films calculated from thermal analysis for scanning-laser annealing.
This paper newly proposes a dust counter of the laser beam scanning type and describes its principle in some detail. A preliminary experiment was performed to verify its usefulness in a highly clean condition.
Two methods are reported in this paper for measuring velocity gradients, namely, by means of the laser Doppler effect and the spatial filtering effect. The velocity gradient is determined from measurements of the velocity difference at two probing points of the object. The properties of output beat signals are theoretically studied from the spectral broadening. A preliminary experiment is performed by using rotating disks. In addition, both the laser Doppler method and the spatial filter method are compared in theory and experiment. The results show the feasibility of both methods for measuring velocity gradients.
The laboratory-type hydrogen masers were operated continuously for about 200 days by using the automatic cavity tuning system. In this paper, the structure of the masers, the auto-tuning system and the results of the continuous operation are described. In the auto-tuning system, the state selection exchange method was used to vary the atomic flux for cavity tuning. It became clear that this system is stable and operates with high reliability for a considerable period of time. The frequency differences between each of the hydrogen masers as well as each maser and each of the several commercial cesium frequency standards were measured during the period of the continuous operation. As a result of frequency comparison, a linear drift was observed in the maser frequency. It is considered that this linear drift is due to a change in the wall shift.