Permalloy Disk Replicator for Amorphous Film 2 µm Bubble Devices

A permalloy disk replicator in an amorphous film 2 µm bubble device has been studied for different geometrical dimensions, and from quasi-static to 200 kHz operating frequency. Distinct regions of the margin plot are observed, and their dependence on geometry is analyzed. It is found that for reliable replication over a wide margin range, the poles from the replicator disk, from the neighboring propagation channel, and from the previously replicated bubbles must be carefully balanced. A replicator with 20% margins on 2-micron GdCoMo films is shown and methods for further improvements are discussed. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.