A Thin Magnetic Film Computer Memo ' Ry Using a Reso ' Nant Abso ' Rption Nondestructive Readout Technique
نویسنده
چکیده
H. D. Toombs and T. E. Hasty have described a technique utilizing ferromagnetic resonance to obtain nondestructive readout in thin permalloy film memories. 1 A study has been made by the authors to determine how this technique could best be utilized in medium and large sized computer memories. The study culminated in the construction of a 32-word, 24-bit film plane tester utilizing absorption resonance readout which served to provide data on the resonant behavior of various films and to lend practical experience in the design of a resonance memory. Resonance absorption may be demonstrated by subjecting a ferromagnetic material sample to a steady magnetic field which (viewed classically) sets up an axis of precession for the electron spins responsible for the materials magnetic moment. If a R.F. field is now applied perpendicular to this axis with a frequency near the natural precession frequency
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