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    42.
    发明专利
    未知

    公开(公告)号：FR2309013A1

    公开(公告)日：1976-11-19

    申请号：FR7605147

    申请日：1976-02-17

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: G11C11/14 ,  G11C19/08

    Abstract: 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).

    43.
    发明专利
    未知

    公开(公告)号：DE2616938A1

    公开(公告)日：1976-10-28

    申请号：DE2616938

    申请日：1976-04-17

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00

    Abstract: 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).

    MAGNETIC HEAD ASSEMBLY
    44.
    发明专利
    MAGNETIC HEAD ASSEMBLY 未知

    公开(公告)号：AU7316074A

    公开(公告)日：1976-03-18

    申请号：AU7316074

    申请日：1974-09-10

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: G01D5/18 ,  G01D5/245 ,  G01R33/09 ,  G07D7/00 ,  G07D7/08 ,  G11B5/39 ,  G11B23/00 ,  G11B5/30

    Abstract: A magnetic read head assembly comprises two magnetostatically coupled magnetoresistive (MR) elements, and conducting means for supplying a drive current to the elements. The drive current serves as a sense current as well as a bias current. The drive current is provided to both elements concurrently, so that the current through each element serves to magnetically bias the other element. An output differential read signal is obtained from the two MR elements.

    46.
    发明专利
    未知

    公开(公告)号：DE2515912A1

    公开(公告)日：1975-12-18

    申请号：DE2515912

    申请日：1975-04-11

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: G11C11/14 ,  G11C19/08 ,  H01F41/14 ,  H01F10/00

    Abstract: Semicircular magnetic domains are propagated along a narrow track. Magnetostatic interaction prevents two domains from being situated directly opposite each other on the track and thus binary data storage can occur using bubble presence on the sides of the track as 1's or 0's. A shift register can comprise a pair of domain generators, the propagation track with or without propagating means and a pair of sensors and annihilators, one of the domain generators, sensors and annihilators being located on each side of the track. A loop store may comprise tracks formed on the circumference of a cylinder of the domain medium. The track can be formed by a physical separation in the domain medium, such as a physical crack scribed by a laser beam or by ion-milling grooves. The track can also be defined by a narrow region with in-plane anisotropy formed by ion implantation.

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