公开(公告)号：DE1228305B

公开(公告)日：1966-11-10

申请号：DEJ0024781

申请日：1963-11-23

Applicant: IBM

Inventor： PUGH EMERSON WILLIAM ,  DELIVERY GENERAL

IPC: G11B5/62 ,  G11C8/00 ,  G11C19/08 ,  G11C21/02 ,  H01F10/08 ,  H03H9/30 ,  H03K17/84

Abstract: 997,777. Magnetic pulse-storage apparatus; electromechanical delay lines. INTERNATIONAL BUSINESS MACHINES CORPORATION. Aug. 26, 1963 [Nov. 30, 1962; Aug. 27, 1962 (2)], No. 33643/63. Headings H3B and H3U. A storage device comprises an elongated thin film 18 of magnetostrictive material deposited on a substrate 10 through which a stress wave is propagated such that a magnetic state established in a first region of the film by a magnetic field is propagated to a second region of the film. As shown in Figs. 1 and 2, a nickel-iron magnetostrictive film 18 on a quartz substrate 10 is subjected to a mechanical tension and compression wave 28 from generator 14 and transducer 12 and to a magnetic field produced by signal input generator 24 coupled to input conductor 20. The series of tension and compression waves cause the film 18 to exhibit an induced longitudinal anisotropy in the zones A, C, E and an induced transverse anisotropy in the zones B, D, F along the easy Y axis. Binary information may be entered into the circuit of Fig. 1 when the portion of film 18 coupled by input conductor 20 is subjected to mechanical induced longitudinal anisotropy due to tension, by applying a current pulse to the conductor 20 so as to produce a magnetic field to the right or left along the longitudinal axis. The magnetization of the zone A then takes up the position as shown in Figs. 3a, 3c, 3e dependent upon the direction of the magnetic field produced by conductor 20. The NÚel wall thus initiated is propagated along the film 18 by the stress wave as shown in Fig. 3. The change in magnetization of the last zone F is detected by output conductor 22 connected to load 26. In order to ensure that the magnetization of each of the zones of film 18 orients itself in the same direction along the easy axis during the period when the zone is exhibiting an induced transverse anisotropy, the film is subjected to a magnetic bias along its easy axis by a pair of Helmholtz coils. In order to store the information the output conductor is coupled back to the input. In the arrangement of Fig. 4 (not shown) the absorbing plate 16 of Fig. 1 is replaced by a second source and transducer supplying a stress of the same frequency and amplitude as that delivered from source 14. By varying the phase of this second source to be 180 degrees out of phase the two stress waves cancel out, so that a domain wall being transferred towards the output conductor remains in the zone it is in on application of the second wave. The direction of travel of the domain walls along the longitudinal axis may be reversed by appropriate choice of the phases of the two waves. In the embodiments of Fig. 6 (not shown) and Fig. 9 the input and output conductors 21 1 , 23 1 are positioned as shown transverse to the easy axis Y of the magnetostrictive film 118 1 . The input conductor 21 1 is energized by input means 124 1 to apply a magnetic field along the easy axis, Fig. 8 (not shown), such that a magnetic domain wall is established which is propagated along the film by the stress wave from source 114 1 . Information is thus represented by the presence or absence of a domain wall, which domain wall is sensed by output conductor 23 1 . Control coil 130 is energized by selectively operable current source 132 to apply a magnetic field directed transverse with respect to the plane of the film 118 1 . The thickness of the film is made such that NÚel walls are established, i.e. the magnetization vectors rotate from one direction to another within the plane of the film, and these walls are propagated along the film. However, when control coil 130 is energized the magnetization vectors of the film are rotated out of the plane of the film in each place where a NÚel wall exists so that a Bloch wall is established, i.e. wherein the magnetization vectors rotate from one direction to another by spirally rotating out of the plane of the film, Fig. 10 (not shown). Thus coincidence of both stress-induced anisotrophy and domain vector orientation within the plane of the film is absent and the domain wall is not propagated, thereby allowing the information to be permanently stored in the film.

公开(公告)号：DE2457195A1

公开(公告)日：1975-07-10

申请号：DE2457195

申请日：1974-12-04

Applicant: IBM

Inventor： PUGH EMERSON WILLIAM

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

Abstract: Gapless, single-sided propagation structures are provided for implementing the continuous movement of magnetic bubble domains in both straight lines and around reverse direction turns under the control of a reorienting in-plane field. One embodiment comprises a closed loop of open-sided, joined hexagonal patterns having traps and dead end legs at the joined corners to cause transfer from one hexagonal pattern to the next, thus implementing continuous circulation around the loop and preventing backtracking. Another embodiment employs straight, parallel strips joined at their ends to form a loop. Bubble movement is promoted by a series of angled strip legs intersecting the main strips to provide sequentially advancing magnetic poles as the field vector rotates.

公开(公告)号：DE1236005B

公开(公告)日：1967-03-09

申请号：DEJ0027875

申请日：1965-04-09

Applicant: IBM

Inventor： PUGH EMERSON WILLIAM

IPC: G11C7/00 ,  G11C7/02 ,  G11C11/14 ,  G11C11/21 ,  H03K5/04

Abstract: 1,091,965. Magnetic pulse storage elements. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 12, 1965 [May 1, 1964], No. 15384/65. Heading H1T. [Also in Division H3] In a magnetic thin film memory, at least one magnetic thin film element 10 on an electrically conductive ground plane 28 has a bit-drive line 20 associated therewith and connected to the ground plane and noise due to the inductance of the ground plane is reduced by closely following or preceding each bit-drive pulse by a pulse of opposite polarity. As shown in Fig. 4, a generator 80 feeds a bit-drive pulse of appropriate polarity through resistor 84 and also through delay 82 and inverting transformer 88 to form a bipolar pulse 96 which is fed to the bitdrive conductor 20. Word-drive line 18 and sense line 26 are provided, Fig. 1 (not shown).

公开(公告)号：DE3067382D1

公开(公告)日：1984-05-10

申请号：DE3067382

申请日：1980-11-18

Applicant: IBM

Inventor： KEEFE GEORGE EDWARD ,  PUGH EMERSON WILLIAM

IPC: G11C19/08

公开(公告)号：DE2828125A1

公开(公告)日：1979-01-11

申请号：DE2828125

申请日：1978-06-27

Applicant: IBM

Inventor： COHEN MITCHELL SIMMONS ,  PUGH EMERSON WILLIAM

IPC: G11C11/14 ,  G11C19/08 ,  H01F10/02

Abstract: These improved current controlled transfer switches are particularly useful for changing the propagation path of very small bubble domains without requiring large amounts of transfer current. The underlying principle is that the transfer operation occurs when the magnitude of the magnetic drive field used to move bubble domains has diminished to a small value, or is zero. This means that the magnetic field due to current in the switch does not have to overcome the effect of the drive field and therefore can be very small while still being effective. This is termed a "start/stop" operation and in one embodiment, current-assisted transfer is achieved by utilizing a change in the sequence of the magnetic drive field (generally an in-plane rotating field) at the time of transfer. In another embodiment, a continuous "three-quadrant" magnetic drive field is used instead of the customary 360 DEG rotating drive field. This three-quadrant field cycle is also the normal cycle for bubble storage operations and bubble motion elsewhere in the magnetic circuit is not disturbed by the switching operation because all devices are designed to operate with only one type of drive field cycle, which is the three-quadrant cycle. Switches operating in accordance with these principles do not have to have a particular design; in fact, several different designs are illustrated.