| 摘要 |
1526871 Magnetic bubble generators INTERNATIONAL BUSINESS MACHINES CORP 21 Jan 1976 [21 April 1975] 02323/76 Heading H3B Magnetic bubbles having desired wall states are produced by generating a bubble having a known wall state, elongating it, rotating its wall magnetization transversely and splitting it. In Fig. 3, currents I 2 , I 3 in conductors 12, 14 and an in plane field 23 nucleate a bubble 22a having a pair of Bloch lines B. Currents I 1 and -I 2 in conductors 16, 12 move the bubble to position 22b and allow the Bloch lines to take antiparallel positions owing to the gyromagnetic spaces in a moving domain wall. Current I, alone reduces the bias field and the bubble 22b elongates within the constriction in conductor 16. The application of an in-plane field H or a velocity component V to the elongated bubble 22c causes the wall magnetization vector to rotate to an orientation transverse to the wall, thereby establishing a further pair of Bloch lines when the bubble is split by a current pulse I 3 in. conductor 14. The further pair may be associated with either half of the elongated bubble by choice of direction of H c or V either to produce bubbles D 1 , D 2 as in Fig. 2a designated state S= 1 and S = - 1 respectively, or two bubbles each having a single pair of Bloch lines designated state S=0. The process may be repeated using either of the generated bubbles as starting point and possibly recirculating one to produce any desired wall state bubble as outlined in Fig. 9 (not shown). |
