Staggered Ratchet Shaped Propagation Patterns for Contiguous Disk Magnetic Bubble Devices
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Staggered ratchet-shaped propagation patterns for contiguous-disk bubble devices provide increased margin and packing density. As shown in Fig. 1, a propagation pattern 10 for contiguous-disk bubble devices consists of rows or tracks 12 and 14 which are separated by an ion-implanted region 16. The cusps 18 on track 12 are offset by one-half of the period relative to the cusps 20 on track 14. Lines bisecting and pointing toward the cusps 18 and 20 point along one of the three specific directions [(1, 1,2), (2,1,1)] which are called the easy stripe-out directions and which are depicted as ES in Fig. 1. The outward normals of the non-implanted regions (tracks 12 and 14) are along ES directions except in the vicinity of the cusps and tips which are rounded.