公开(公告)号：JPH104227A

公开(公告)日：1998-01-06

申请号：JP5877797

申请日：1997-03-13

Applicant: IBM

Inventor： GALLAGHER WILLIAM JOSEPH ,  PARKIN STUART STEPHEN PAPWORTH ,  SLONCZEWSKI JOHN CASIMIR ,  JONATHAN ZANHON SAN

IPC: G01R33/06 ,  G01R33/09 ,  G11B5/39 ,  G11C11/14 ,  G11C11/15 ,  G11C11/16 ,  H01L21/8246 ,  H01L27/105 ,  H01L27/22 ,  H01L43/08

Abstract: PROBLEM TO BE SOLVED: To control magnetoresistance response to a magnetic signal by a method wherein a constrained ferromagnetic layer, having a side part circumfer ence which is not extended over the side part circumference of an insulating tunnel layer, is retained within the another spaced plane surface without overlap ping with an insulating tunnel layer. SOLUTION: Write in an MJT is attained by allowing a current to flow through the upper and lower electrode wiring layers on the memory cell application of a magnetic tunnel junction MTJ element. When a sufficiently large current is allowed to flow through the above-mentioned lines, the magnetization direction of a free ferromagnetic layer 32 is rotated in reverse parallel from parallel to the magnetization direction of a constrained ferromagnetic layer 18 by the coupled magnetic field formed in the vicinity of a free ferromagnetic layer 32. Current level is selected in such a manner that the coupling magnetic field to be formed exceeds the switching field of the free ferromagnetic layer. The magnetic field formed by a coupling write-in current is selected smaller than the magnetic field required for rotation of the magnetization direction of the constrained ferromagnetic layer.

公开(公告)号：AU7269374A

公开(公告)日：1976-02-26

申请号：AU7269374

申请日：1974-08-26

Applicant: IBM

Inventor： SLONCZEWSKI JOHN CASIMIR ,  COLHOUN BERTRAM ALLEN ,  VOEGELI OTTO

IPC: G11C11/14 ,  G11C19/08 ,  H03K23/24

公开(公告)号：DE2441280A1

公开(公告)日：1975-04-10

申请号：DE2441280

申请日：1974-08-29

Applicant: IBM

Inventor： CALHOUN BERTRAM ALLEN ,  SLONCZEWSKI JOHN CASIMIR ,  VOEGELI OTTO

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

公开(公告)号：DE2801052A1

公开(公告)日：1978-07-13

申请号：DE2801052

申请日：1978-01-11

Applicant: IBM

Inventor： ARGYLE BERNELL EDWIN ,  DEKKER PIETER ,  SLONCZEWSKI JOHN CASIMIR

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

Abstract: Magnetic bubble domains are propagated in a magnetic medium in a desired direction using in-plane magnetic fields which are time varying but which have no spatial gradients. In applications such as information storage, the need for conventional propagation structures, such as offset conductor loops, patterned magnetic elements, and patterned ion implantation regions is reduced. Bubble domains having unwinding pairs of Bloch lines in their wall magnetization can be moved by applying appropriate in-plane magnetic fields, without the need for spatial gradients or variations in the magnetic field normal to the plane of the magnetic medium. The continuous movement of these bubble domains occurs by a cyclic process where the Bloch lines switch between two configurations, in an asymmetric way in response to the time varying in-plane field.

公开(公告)号：DE1098994B

公开(公告)日：1961-02-09

申请号：DEI0014711

申请日：1958-04-19

Applicant: IBM DEUTSCHLAND

Inventor： DUNHAM BRADFORD ,  SLONCZEWSKI JOHN CASIMIR

IPC: G11C19/08 ,  H03K17/84

Abstract: 951,056. Shift registers. INTERNATIONAL BUSINESS MACHINES CORPORATION. March 7, 1960 [March 6, 1959], No. 36055/63. Divided out of 951, 053. Heading G4C. [Also in Division H3] The subject of this Specification is the same as that of Specification 951,053 but the claims are concerned with a data register including a plurality of anisotropic elements of magnetic material in which binary information recorded in a first element is caused to determine the binary information state of a second element by applying to the latter a magnetic field transverse to its easy axis of magnetisation and a field, derived from the first element, along its easy axis, means being provided to cause a third element to assume the binary state of the second element by applying to the third element a transverse field and a field, derived from the second element, along its easy axis.

公开(公告)号：DE2706504A1

公开(公告)日：1977-08-25

申请号：DE2706504

申请日：1977-02-16

Applicant: IBM

Inventor： ARGYLE BERNELL EDWIN ,  SLONCZEWSKI JOHN CASIMIR ,  DEKKER PIETER

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

公开(公告)号：DE2412879A1

公开(公告)日：1975-01-16

申请号：DE2412879

申请日：1974-03-18

Applicant: IBM

Inventor： SLONCZEWSKI JOHN CASIMIR

IPC: G11C11/14 ,  G11C19/08 ,  H03K19/168

Abstract: A magnetic domain system utilizing domains having different wall magnetization properties. In particular, domains are herein characterized in accordance with their direction of motion in a gradient magnetic field which is substantially parallel to an easy axis of magnetization of the medium in which the domains exist. This deflection is in turn dependent upon the number of rotations of the magnetic moments in the domain wall, i.e., the total number and sign of the vertical Bloch lines present in the periphery of the domain. Magnetic systems are shown utilizing generators for producing domains of desired state, storage means for storing these domains, and sensing means for detecting the different states of the domains. Since multistate magnetic domains are generated, various levels of logic circuitry can be designed. Examples include ternary logic systems and functional memories.

公开(公告)号：DE2725391A1

公开(公告)日：1977-12-29

申请号：DE2725391

申请日：1977-06-04

Applicant: IBM

Inventor： ARGYLE BERNELL EDWIN ,  DEKKER PIETER ,  SLONCZEWSKI JOHN CASIMIR

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

Abstract: A technique for controllably providing state conversions between bubble domains having a common winding number S is described. In particular, controlled conversions between bubble domains having winding number S=1 is achieved by the application of spatially invariant, homogeneous magnetic fields. For the conversion of sigma bubbles (having two vertical Bloch lines) to chi bubbles (having no vertical Bloch lines), an in-plane field is not required and only a time varying perpendicular z-field is used. For conversion of a chi + bubble to a chi - bubble, and vice versa, a time varying field pulse is applied, there being no requirement for an in-plane magnetic field. However, for the conversion of chi bubbles to sigma bubbles, an in-plane field is used simultaneously with a time varying z-field. For all controlled conversions, the applied magnetic fields do not have spatial gradients. The magnitudes of the applied magnetic fields and the rise and fall times of the z field are controlled within certain ranges in order to have controlled conversion of one state to another.

公开(公告)号：DE2628153A1

公开(公告)日：1977-02-03

申请号：DE2628153

申请日：1976-06-23

Applicant: IBM

Inventor： FAN GEORGE J ,  SLONCZEWSKI JOHN CASIMIR

IPC: B41J2/075 ,  B41J2/025 ,  B41J2/105 ,  G06K15/14 ,  B41J3/04

Abstract: A silicon body has an array of nozzles therein and a separate magnet for each nozzle integral with the body. The magnet is disposed adjacent the nozzle with which it cooperates so that it can apply a deflection, prior to break-up of the stream exiting from the nozzle into droplets, to selected portions of the stream. The droplets, which are formed from the selected portions having the magnetic deflection applied thereto from the magnet cooperating with the nozzle, deflect to a gutter and are not applied to a recording surface, which moves orthogonal to the nozzles. If desired, the winding of the magnet can have a second excitation frequency supplied thereto to break up the stream into droplets. The break-up of the stream into droplets also can be accomplished by vibrations produced by a piezoelectric transducer, for example.

公开(公告)号：DE2327313A1

公开(公告)日：1974-01-10

申请号：DE2327313

申请日：1973-05-29

Applicant: IBM

Inventor： CALHOUN BERTRAM ALLEN ,  CHANG HSU ,  ROSIER LAURENCE LEE ,  SLONCZEWSKI JOHN CASIMIR

IPC: G11C11/14 ,  G11C19/08

Abstract: 1437014 Moving domain systems INTERNATIONAL BUSINESS MACHINES CORP 15 June 1973 [22 June 1972] 28631/73 Heading H3B In a bubble domain system the fields applied to a bubble domain device are too small to cause propagation or collapse unless a controlling in-plane bias field is applied. In Fig. 4 strip lines X1, X2, Y1 and Y2 overlie bubble device 10 and may be activated in pairs to provide an in-plane bias field. The device 10 has an angel-fish propagation pattern 18, though any other propagation system may be used; the field source 12 provides a varying bias field normal to the device as is conventional when angel-fish are used, but this bias field variation is such that a domain oscillates between two adjacent angle-fish and does not propagate. It is found that when an in-plane field is applied by coincident operation of an X strip line and a Y strip line the domain mobility is increased and propagation occurs. The use of an in-plane control field also allows other functions such as annihilation to be similarly controlled; a presence/absence bubble domain system in which bubbles are only generated and collapsed, without being propagated, can also be controlled, Fig. 6 (not shown). The in-plane control may be used with any bubble domain material, the minimum in-plane field being when the field is perpendicular to the propagation direction and being given by the expression where h is the thickness of the material and A is its exchange coefficient.