Browse Prior Art Database

Purse Program Generator

IP.com Disclosure Number: IPCOM000098011D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Middelnoek, M: AUTHOR [+2]

Abstract

The device generates a sequence of pulses utilizing the switch over of a set of thin magnetic films with different coercive forces H(C) for wall motion.

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Purse Program Generator

The device generates a sequence of pulses utilizing the switch over of a set of thin magnetic films with different coercive forces H(C) for wall motion.

Driver coil 1 is connected to sawtooth generator 2. When current flows through 1, a magnetic driving field H(d) is generated. This extends over and acts on permalloy thin films 11 and 12. The films exhibit a uniaxial anisotropy in the easy direction epsilon. The coercive force H(c)/(11)/ of film 11 is smaller than the coercive force H(c)/(12)/ of film 12. The effect is that, with a driving field H(d) increasing with time t, the magnetization reversal of film 11 takes place earlier than the magnetization reversal of film 12.

A pickup coil 3 is connected to pulse former 4 and amplifier 5. These serve for the adjustment of amplitude and duration of the pulses induced in 3, when a switchover of the magnetization of a thin magnetic film occurs. When the strength of the sawtooth magnetic driving field H(d) reaches the coercive force H(c)/(11)/ at the instant t(1), the magnetization of film 11 reverses and pulse P(1) is induced into the pickup coil. At the instant t(2), the driving field H(d) reaches the coercive force H(c)/(12)/, causing a reversal of the magnetization of film 12 and generation of pulse P(2).

The pulse program is cyclically repeated when, at the end of each cycle, the films are switched back to their initial position by, e.g., the decay flank of the sawtooth waveform. Variation...