公开(公告)号：CA1096040A

公开(公告)日：1981-02-17

申请号：CA271786

申请日：1977-02-11

Applicant: IBM

Inventor： ARGYLE BERNELL E ,  SLONCZEWSKI JOHN C ,  DEKKER PIETER

IPC: G11C11/14 ,  G11C19/08

Abstract: Magnetic bubble domains are propagated in a magnetic medium in a desired direction using magnetic fields which have no spatial gradients. This is in contrast with conventional propagation techniques where magnetic overlays have to be used with applied magnetic fields in order to move domains. Depending upon the wall magnetization configurations in the domains, those domains are propagated by using, for example, a combination of a steady magnetic field and a magnetic field which varies with time, such as a pulse field or a sinusoidal field. This type of propagation is termed automotion. Bubbles which can automate are generated and detected in the magnetic medium using the principals of automotion. Embodiments a:- shown for representation of information using different types of bubbles, and in particular it is shown how to discriminate among bubble domains having wall configurations having a common winding number s. In a particular embodiment, a modulated bias field is superimposed on a steady magnetic field in the plane of the magnetic medium. Depending upon the direction of the in-plane magnetic field and upon the wall magnetization configuration of the bubbles, the bubbles can be made to move in different directions regardless of the directions of the modulated bias field.

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：FR2341915A1

公开(公告)日：1977-09-16

申请号：FR7700645

申请日：1977-01-05

Applicant: IBM

Inventor： ARGYLE BERNELL E ,  SLONCZEWSKI JOHN C ,  DEKKER PIETER

IPC: G11C11/14 ,  G11C19/08

公开(公告)号：FR2377684A1

公开(公告)日：1978-08-11

申请号：FR7737950

申请日：1977-12-09

Applicant: IBM

Inventor： ARGYLE BERNELL E ,  DEKKER PIETER ,  SLONCZEWSKI JOHN C

IPC: G11C11/14 ,  G11C19/08

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：FR2355356A1

公开(公告)日：1978-01-13

申请号：FR7714008

申请日：1977-05-03

Applicant: IBM

Inventor： ARGYLE BERNELL R ,  DEKKER PIETER ,  SLONCZEWSKI JOHN C

IPC: G11C11/14 ,  G11C19/08

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：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：CA1098208A

公开(公告)日：1981-03-24

申请号：CA278854

申请日：1977-05-20

Applicant: IBM

Inventor： ARGYLE BERNELL E ,  DEKKER PIETER ,  SLONCZEWSKI JOHN C

IPC: G11C11/14 ,  G11C19/08 ,  G11B5/84

Abstract: CONTROLLABLE STATE CONVERSIONS FOR S=1 BUBBLE DOMAINS 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 X 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 X+ bubble to a Xbubble, 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 X 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：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：CA1111555A

公开(公告)日：1981-10-27

申请号：CA291087

申请日：1977-11-17

Applicant: IBM

Inventor： ARGYLE BERNELL E ,  DEKKER PIETER ,  SLONCZEWSKI JOHN C

IPC: G11C11/14 ,  G11C19/08

Abstract: GRADIENTLESS PROPULSION OF MAGNETIC BUBBLE DOMAINS USING MODULATED IN-PLANE FIELDS 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.