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Thin Film Shift Register Using Magnetostatic Coupling

IP.com Disclosure Number: IPCOM000095762D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 58K

Publishing Venue

IBM

Related People

Middelhoek, S: AUTHOR

Abstract

The shift register has a continuous film strip 10 divided into magnetic film regions 1a, 2a, 3a, 1b, 2b, 3b, 1c, 2c and 3c aligned along the length of the strip 10. Each region has an easy axis 12 perpendicular to the length of the strip 10 and, thus, perpendicular to the direction of information shift in the shift register, which direction is considered as being from left to right.

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Thin Film Shift Register Using Magnetostatic Coupling

The shift register has a continuous film strip 10 divided into magnetic film regions 1a, 2a, 3a, 1b, 2b, 3b, 1c, 2c and 3c aligned along the length of the strip
10. Each region has an easy axis 12 perpendicular to the length of the strip 10 and, thus, perpendicular to the direction of information shift in the shift register, which direction is considered as being from left to right.

The shift register also has a clock pulse source 14. To this is connected a first circuit C1 for carrying current pulses i1 to produce simultaneously a saturated magnetic field in the hard direction at film regions 1a, 1b and 1c. To source 14 there is also connected a second circuit C2 for carrying current pulses i2 to produce simultaneously a saturated magnetic field in the hard direction at film regions 2a, 2b, and 2c. There is also connected to source 14 a third circuit for carrying pulses i3 to produce simultaneously a saturated magnetic field in the hard direction at film regions 3a, 3b and 3c. An information source 16 inserts information into regions 1a of the strip 10 via a first coil 18. Information is taken out of region 3c of the strip 10 by a second coil 20 connected to a load 22, which can be a conventional sense amplifier.

In the operation of the shift register during a first time period tI, a hard direction field is applied only to the 2 regions. A 0 is stored in the 3a and 1b regions, another 0 is stored in the 3b and 1c regions and a 1 is stored in the 3c region. During period tII the hard direction field is maintained in the 2 regions and a hard direction field is applied to the 3 regions which destroys the information contained in them during period tI. During period tII there is also applied an easy direction field by a positive input current pulse from the information source 16 and first coil 18 to region 1a to store information in it, for example...