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公开(公告)号：SE7603387L
公开(公告)日：1976-10-22
申请号：SE7603387
申请日：1976-03-18
Applicant: IBM
Inventor： VOEGELI O
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).
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公开(公告)号：SE401287B
公开(公告)日：1978-04-24
申请号：SE7411287
申请日：1974-09-06
Applicant: IBM
Inventor： CALHOUN B A , SLONCZEWSKI J C , VOEGELI O
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公开(公告)号：BR7408252D0
公开(公告)日：1975-07-22
申请号：BR825274
申请日：1974-10-04
Applicant: IBM
Inventor： VOEGELI O
IPC: G01D5/18 , G01D5/245 , G01R33/09 , G07D7/00 , G07D7/08 , G11B5/39 , G11B23/00 , G11B21/00 , G11B5/00
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.
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Patent Agency Ranking
公开(公告)号：SE343970B
公开(公告)日：1972-03-20
申请号：SE1527267
申请日：1967-11-07
Applicant: IBM
Inventor： VOEGELI O , MEE C , MACDONALD R
IPC: G11B11/105 , G11C11/02
Abstract: 1,133,919. Magneto-optical data storage. INTERNATIONAL BUSINESS MACHINES CORP. 19 Oct., 1967 [10 Nov., 1966], No. 47554/67. Heading H3B. Data stored in a magnetic garnet thin film is read by directing a beam of polarized light, having a wavelength less than 5000 A, on to the storage location and detecting changes in the polarization of the beam caused by the stored data. The film preferably consists of gadolinium iron garnet, less than 2 microns thick, and preferably 0À2 micron thick, mounted on a transparent substrate. The film is maintained at its compensation temperature in a magnetic field which is incapable of switching the magnetization direction of any part of the film at the compensation temperature. To store data polarized light, e.g. from a zinc oxide laser or from a gallium arsenide laser associated with a frequency doubler, is directed on to a selected region of the film by means of an optical deflector, and raises the temperature of this region. The magnetic field is then sufficient to switch the magnetization in this region to store a " 1," for example. If a " 0 " is to be stored either the light beam or the magnetic field is suppressed, or the field is reversed. During read out the magnetic field is switched off and the film is scanned more rapidly to reduce to heating of the storage sites. The reading process may utilize either the Faraday effect, whereby the plane of polarization of the beam is rotated, or the circular dichroism of the film, whereby one of the circularly polarized components of the incident beam is absorbed more than the other, depending on the direction of the remanent magnetization in the storage region.
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公开(公告)号：SE402831B
公开(公告)日：1978-07-17
申请号：SE7603387
申请日：1976-03-18
Applicant: IBM
Inventor： VOEGELI O
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).
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公开(公告)号：SE401284B
公开(公告)日：1978-04-24
申请号：SE7411850
申请日：1974-09-20
Applicant: IBM
Inventor： VOEGELI O
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.
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公开(公告)号：BR7602470A
公开(公告)日：1976-10-19
申请号：BR7602470
申请日：1976-04-22
Applicant: IBM
Inventor： VOEGELI O
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).
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