Bernell E Argyle

US Patent:

6593739, Jul 15, 2003

Filed:

Jun 7, 2001

Appl. No.:

09/876621

Inventors:

Bernell Edwin Argyle - Hopewell Junction NY
Jeffery Gregory McCord - San Jose CA

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

G01R 33032

US Classification:

3242441, 324210, 324244, 356390, 359 68

Abstract:

An optical apparatus and methods for efficiently determining the magnetization of a material at very high optical resolution are disclosed. Individual components of the magnetization may be determined. Components in the plane of the sample surface are imaged by illuminating the material obliquely with substantially parallel light of relatively high power and very well controlled uniformity and polarization, and using light scattered obliquely in a parallel beam in the opposite direction at the same angle as the angle of incidence to record an image. Reversing the illumination and observation directions allows subtraction of the two images and measurement of the magnetization in-plane. A second in-plane component orthogonal to the first, is obtained similarly after reorienting the plane of incidence 90 degrees. The third magnetization component,âperpendicular to the sample surfaceâ, may be obtained using illumination at both angles of incidence and subtracting two images, each recorded when a light-polarization angle of offset from extinction, is reversed. All three components may thereby be imaged without recourse to modulating the sample magnetization as in previous methods.

US Patent:

6672739, Jan 6, 2004

Filed:

Aug 30, 1999

Appl. No.:

09/386017

Inventors:

Bernell Edwin Argyle - Hopewell Junction NY
Jeffery Gregory McCord - San Jose CA

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

F21K 2706

US Classification:

362259, 362553, 372 9, 385 28, 385901

Abstract:

An apparatus, system, and method for illuminating a lithographic mask or an object in a microscope is presented, whereby the output of a laser beam homogenizer is imaged on to a field such as the object plane for lithographic application or on to the rear focal plane of an epi illuminating objective lens as a source for wide field illumination at an object plane in a microscope (for application to magnified imaging of weak phase objects). , and the image of the output is dithered with respect to the field.

US Patent:

40682200, Jan 10, 1978

Filed:

Jun 17, 1976

Appl. No.:

5/697170

Inventors:

Bernell Edwin Argyle - Putnam Valley NY
Pieter Dekker - Venlo, NL
John Casimir Slonczewski - Katonah NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11C 1114

US Classification:

365 30

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. sub. + bubble to a. chi. sub. - 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.

US Patent:

41786360, Dec 11, 1979

Filed:

Feb 15, 1978

Appl. No.:

5/877928

Inventors:

Bernell E. Argyle - Putnam Valley NY
John C. Slonczewski - Katonah NY
Pieter Dekker - Ossining NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11C 1908

US Classification:

365 30

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, these 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 automote are generated and detected in the magnetic medium using the principles of automotion. Embodiments are 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.

US Patent:

41187938, Oct 3, 1978

Filed:

Jan 12, 1977

Appl. No.:

5/758887

Inventors:

Bernell Edwin Argyle - Putnam Valley NY
Pieter Dekker - Kortenhoef, NL
John Casimir Slonczewski - Katonah NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11C 1908

US Classification:

365 30

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.

US Patent:

61410934, Oct 31, 2000

Filed:

Aug 25, 1998

Appl. No.:

9/139515

Inventors:

Bernell E. Argyle - Hopewell Junction NY
Arnold Halperin - Cortlandt Manor NY
Michael E. Scaman - Goshen NY
Edward J. Yarmchuk - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01N 2100
G01R 2714

US Classification:

3562371

Abstract:

An apparatus and corresponding method for detecting, locating, or defining a short in a thin-film module. The apparatus includes a mechanical fixture supporting the module. A current source provides a current pulse to the module which produces a magnetic field and heating nearby the short which turns on and off as the pulsed current in the short turns on and off. Polarized light is directed onto the module, with an intermediate element disposed between the module and the source of the polarized light. The intermediate element may be a stress birefringent coating (e. g. , a polyimide insulating layer) disposed on the module and onto which the polarized light is directed. The sample is rotated 0 to 45 degrees to maximize the birefringent effect. Alternatively, the intermediate element may be a magneto-optical Faraday rotator. A microscope is used to observe the module, facilitating identification of a short by the twisting of the polarization of the light as the short expands and shrinks in response to the heating or in response to the localized magnetic field.

US Patent:

53317289, Jul 26, 1994

Filed:

May 13, 1991

Appl. No.:

7/686782

Inventors:

Bernell E. Argyle - Putnam Valley NY
Thomas C. Arnoldussen - Los Altos CA
Thomas J. Beaulieu - Hollister CA
Dean A. Herman - Garrison NY
Sol Krongelb - Katonah NY
Hin P. E. Lee - San Jose CA
Daniel A. Nepela - Saratoga CA
Bojan Petek - Croton-on-Hudson NY
Lubomyr T. Romankiw - Briarcliff Manor NY
John C. Slonczewski - Katonah NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 542

US Classification:

29603

Abstract:

Magnetic thin film structures including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation.

US Patent:

50329456, Jul 16, 1991

Filed:

Nov 7, 1989

Appl. No.:

7/432649

Inventors:

Bernell E. Argyle - Putnam Valley NY
Thomas C. Arnoldussen - Los Altos CA
Thomas J. Beaulieu - Hollister CA
Dean A. Herman - Garrison NY
Sol Krongelb - Katonah NY
Hin P. E. Lee - San Jose CA
Daniel A. Nepela - Saratoga CA
Bojan Petek - Croton-on-Hudson NY
Lubomyr T. Romankiw - Briarcliff Manor NY
John C. Slonczewski - Katonah NY

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

G11B 5147

US Classification:

360126

Abstract:

Magnetic thin film structures are disclosed including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation.