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Magnetic Film Memory

IP.com Disclosure Number: IPCOM000092312D
Original Publication Date: 1968-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Daughton, JM: AUTHOR

Abstract

The memory in drawing A, which is suitable for 2 1/2 D operation, has magnetic film 10 with an easy axis positioned to form an angle omega of between approximately ten and forty-five degrees with word line 12. Bit-sense line 14 is arranged orthogonal to line 12. With a 1 stored in film 10, a unipolar word pulse 16 from word driver 18 rotates the direction of magnetization in film 10 from the normal 1 state through an angle 2 omega to the position indicated by dashed line 20. The output signal Vs produced on line 14 and in sense amplifier 22 is the second harmonic of word pulse 16 as in B. With a 0 stored in the film 10, pulse 16 rotates the direction of magnetization in film 10 from the normal 0 state through an angle less than 90 - omega degrees to produce an output signal Vs on line 14.

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Magnetic Film Memory

The memory in drawing A, which is suitable for 2 1/2 D operation, has magnetic film 10 with an easy axis positioned to form an angle omega of between approximately ten and forty-five degrees with word line 12. Bit-sense line 14 is arranged orthogonal to line 12. With a 1 stored in film 10, a unipolar word pulse 16 from word driver 18 rotates the direction of magnetization in film 10 from the normal 1 state through an angle 2 omega to the position indicated by dashed line 20. The output signal Vs produced on line 14 and in sense amplifier 22 is the second harmonic of word pulse 16 as in B. With a 0 stored in the film 10, pulse 16 rotates the direction of magnetization in film 10 from the normal 0 state through an angle less than 90 - omega degrees to produce an output signal Vs on line 14. Such signal is the first harmonic of pulse 16 as indicated in B. The magnitude of the 0 output signal is somewhat less than the magnitude of the 1 output signal. Any suitable detector detects the second harmonic output signal. When information is written into film 10, a smaller bit current from bit driver 22 is used to write the 0 state than is used to write the 1 state.

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