TEST METHOD OF MAGNETIC BUBBLE MEMORY

摘要

PURPOSE:To enable simple and accurate evaluation for the memory characteristics, by using a prescribed test data pattern. CONSTITUTION:Each loop of a minor loop group is filled with a test pattern which forms a basic pattern with (n) units of patterns 3 of 1 deg. and (n) units of continuous patterns 4 of 0 deg.. Then (n) is defined as 1 in terms of the upper limit value on a bias magnetic field. Thus a shift, etc. of a magnetic bubble between ''Permalloy '' thin film elements or to an adjacent thin film element are detected within a minor loop. Then the (n) is increased successively from 1 as the bias magnetic field is decreased. Then the characteristics of a magnetic bubble memory can be evaluated in a simple and accurate way from the upper limit value of the bias magnetic field.