Title :
Analysis of a Magneto-Optic Readout System
Author :
Fan, G. ; Donath, E. ; Barrekette, E.S. ; Wirgin, A.
Author_Institution :
Thomas J. Watson Research Center, IBM Corporation, Yorktown Heights, N. Y.
Abstract :
The signal and the signal-to-noise ratio in a typical magneto-optic readout scheme intended for use in a high-capacity high-speed memory were analyzed. It was found that such a system does not yield higher signal levels and signal-to-noise ratios than are available with conventional magnetic head readout in such a peripheral memory. Calculations show that for 10-3-inch diameter bits recorded on an iron film in a system using an Osram XBO 150 high-pressure Xenon lamp, the signal-to-noise ratio at a megacycle transfer rate is in the neighborhood of 1. The maximum signal has about 300 photoelectrons per bit at the photocathode. It was concluded that although a magneto-optic system is impractical for such application, it may still be used in some display devices or in a medium-speed, medium-density fast access memory.
Keywords :
Cathodes; Iron; Lamps; Magnetic analysis; Magnetic films; Magnetic heads; Magnetooptic recording; Signal analysis; Signal to noise ratio; Xenon;
Journal_Title :
Electronic Computers, IEEE Transactions on
DOI :
10.1109/PGEC.1963.263385