Magnetic wall assisted bubble domain nucleator

Details Magnetic wall assisted bubble domain nucleator Magnetic wall assisted bubble domain nucleator

1977-05-31

1978-12-05

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Generators

365 36, 365 39, 365 41, G11C 1908

Patent

active

041288955

ABSTRACT:
An improved magnetic bubble domain nucleator is provided which uses a magnetic wall, such as a charged wall, Neel wall, or Bloch wall, to assist nucleation. In a preferred embodiment, a magnetic charged wall is produced in an ion implanted region of a magnetic material with an in-plane magnetic field, and an applied nucleating magnetic field is produced by current in a conductor. The combination of the first magnetic field associated with the charged wall and the second magnetic field produced by current through the conductor is sufficient to nucleate a bubble domain in the magnetic medium whereas each of these fields acting alone is not sufficient for nucleation. Since the first magnetic field provides a component of the total nucleating field, the amount of nucleation current required in the conductor is reduced. Any structure that can be used to provide the magnetic charged wall, including ion implanted regions of a magnetic material, or an apertured layer of magnetically soft material is suitable in the practice of this invention. The structure for providing the second magnetic field is conveniently provided by a current carrying conductor, or by a magnetic element having a stray field associated therewith, or even by another magnetic bubble domain. Thus, this invention seeks to use naturally occurring magnetic walls to assist bubble nucleation rather than using additional structure.

REFERENCES:
patent: 3824571 (1974-07-01), Clover, Jr. et al.
patent: 4070658 (1978-01-01), Giess et al.

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