公开(公告)号：FR2355356A1

公开(公告)日：1978-01-13

申请号：FR7714008

申请日：1977-05-03

Applicant: IBM

Inventor： ARGYLE BERNELL R ,  DEKKER PIETER ,  SLONCZEWSKI JOHN C

IPC: G11C11/14 ,  G11C19/08

Abstract: A technique for controllably providing state conversions between bubble domains having a common winding number S is described. In particular, controlled conversions between bubble domains having winding number S=1 is achieved by the application of spatially invariant, homogeneous magnetic fields. For the conversion of sigma bubbles (having two vertical Bloch lines) to chi bubbles (having no vertical Bloch lines), an in-plane field is not required and only a time varying perpendicular z-field is used. For conversion of a chi + bubble to a chi - bubble, and vice versa, a time varying field pulse is applied, there being no requirement for an in-plane magnetic field. However, for the conversion of chi bubbles to sigma bubbles, an in-plane field is used simultaneously with a time varying z-field. For all controlled conversions, the applied magnetic fields do not have spatial gradients. The magnitudes of the applied magnetic fields and the rise and fall times of the z field are controlled within certain ranges in order to have controlled conversion of one state to another.