Accession Number : ADD006660

Title :   Field Determined Propagation Circuit.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Schwee ,Leonard J ; Anderson ,Wallace E ; Eiu ,Y J ; Lee,Ronald N

Report Date : 08 Nov 1978

Pagination or Media Count : 16

Abstract : A symmetric narrow-wide electrical conductor for propagating binary information represented by Bloch line - crosstie pairs along a serriform crosstie thin magnetic film strip. Another conductor is made with alternate segments disposed upon opposite surfaces of the crosstie strip. The present invention relates to the art of shift registers and more particularly, to serial access, thin magnetic film memories using domain walls for the storage and propagation of binary information. In the crosstie memory, the combination of a Bloch line, negative Neel wall and a crosstie are considered to be a logical 'one,' while the absence of this Bloch line - crosstie pair is considered to be a logical 'zero.' With a single conductor placed above and parallel to serrated strips of permalloy about 370 A thick and twenty-five microns wide, it is possible to effect propagation. A small amplitude (e.g., about 3.0 Oerstads) negative pulse about twenty nanoseconds long is used to move the Bloch line to the next potential well. Then a ten nanosecond positive pulse of about fifteen Oerstads is applied to relocate the crosstie.

Descriptors :   *Patent applications, *Magnetic film memories, Domain walls, Serial processors

Subject Categories : Electrical and Electronic Equipment
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE