Abstract: The present invention relates to the self-assembly of a spherical-morphology block copolymer into V-shaped grooves of a substrate. Although spherical morphology block copolymers typically form a body-centered cubic system (bcc) sphere array in bulk, the V-shaped grooves promote the formation of a face-centered cubic system (fcc) sphere array that is well ordered. In one embodiment, the (111) planes of the fcc sphere array are parallel to the angled side walls of the V-shaped groove. The (100) plane of the fcc sphere array is parallel to the top surface of the substrate, and may show a square symmetry among adjacent spheres. This square symmetry is unlike the hexagonal symmetry seen in monolayers of spherical domains and is a useful geometry for lithography applications, especially those used in semiconductor applications.

Abstract: A magneto-optical isolator device is provided. The isolator device includes a substrate and a bottom cladding layer that is formed on the substrate. An optical resonator structure is formed on the bottom cladding layer. The resonator structure includes crystalline or amorphous diamagnetic silicon or silicon-germanium so as to provide non-reciprocal optical isolation. A top cladding layer is formed on the resonator structure. One or more magnetic layers positioned on the top cladding layer or between the top cladding or bottom cladding layers and the optical resonator structure.

Abstract: The present invention relates to the self-assembly of a spherical-morphology block copolymer into V-shaped grooves of a substrate. Although spherical morphology block copolymers typically form a body-centered cubic system (bcc) sphere array in bulk, the V-shaped grooves promote the formation of a face-centered cubic system (fcc) sphere array that is well ordered. In one embodiment, the (111) planes of the fcc sphere array are parallel to the angled side walls of the V-shaped groove. The (100) plane of the fcc sphere array is parallel to the top surface of the substrate, and may show a square symmetry among adjacent spheres. This square symmetry is unlike the hexagonal symmetry seen in monolayers of spherical domains and is a useful geometry for lithography applications, especially those used in semiconductor applications.

Abstract: A magneto-optical structure is provided. The magneto-optical structure includes a substrate. A waveguide layer is formed on the substrate for guiding electromagnetic radiation received by the magneto-optical structure. The waveguide layer includes magnetic oxide material that comprises ABO3 perovskite doped with transition metal ions on the B site, or transition metal ions doped SnO2, or transition metal ions doped CeO2.

Abstract: The present invention provides articles and methods for affecting the self-assembly of materials. In some cases, the invention provides an approach for facilitating the self-assembly of various materials, including polymeric materials (e.g., block polymers), nanoparticles, other materials capable of self-assembly, and the like, over relatively large surface areas. Some embodiments of the invention provide articles (e.g., substrates) which, when contacted with a material capable of self-assembly, may produce greater control of self-assembly through the bulk of the material.

Abstract: Disclosed is a structure made of a trench patterned substrate having a pre-determined trench period and a pre-determined mesa to trench width ratio, and a block copolymer on top of the trench patterned substrate. The block copolymer has at least an organic block and a silicon-containing block, wherein the block copolymer can have either perpendicular or parallel cylinders. The structure is annealed under a pre-determined vapor pressure for a predetermined annealing time period, wherein the pre-determined trench period, the pre-determined mesa to trench width ratio, the predetermined vapor pressure and the predetermined annealing time period are chosen such that cylinders formed in the block copolymer are either perpendicular or parallel with respect to the trench-patterned substrate. A method is also described to form the above-mentioned structure.

Abstract: A magnetoresistive Wheatstone-bridge structure includes a magnetoresistive ring structure. The magnetoresistive ring structure includes a first magnetic layer comprising a ferromagnetic material. A second magnetic layer also includes a ferromagnetic material. A non-magnetic spacer is positioned between the first magnetic layer and the second magnetic layer. A vacant open region is positioned in the center region of the magnetoresistive ring structure. A plurality of magnetic states can exist in either the first magnetic layer or second magnetic layer. Furthermore, the magnetoresistive Wheatstone-bridge structure includes a plurality of voltage and current contacts arranged symmetrically upon the magnetoresistive ring structure. The magnetic state of the ring is detected by measuring its resistance.

Abstract: A micro-fabricated structure and method of forming a micro-fabricated structure are disclosed. The method includes the steps of forming a first pattern in a first photo-resist, transferring the first pattern in the first photo-resist to a mask layer, forming a second pattern in a second photo-resist, and transferring the second pattern in the second photo-resist to the mask layer. In various embodiments, the method may further include the steps of forming a first pattern in a first photo-resist, forming a second pattern in a second photo-resist, and transferring the first and second patterns to a target layer.

Abstract: An optical isolator is provided. The optical isolator includes a substrate and a thin film is formed comprising of iron oxide or magnetic persovskite-type material having a high Faraday rotation.

Abstract: A magnetic-ring structure includes at least two states, and at least one twisted state that includes a 360° domain wall that can exist over a wide range of applied fields.

Abstract: A magnetic-ring structure includes at least two states, and at least one twisted state that includes a 360° domain wall that can exist over a wide range of applied fields.

Abstract: An optical isolator is provided. The optical isolator includes a substrate and a thin film is formed comprising of iron oxide or magnetic persovskite-type material having a high Faraday rotation.

Abstract: A method of manufacturing a magnetic disk includes the steps of depositing a sublayer, a Cr layer and a Co based magnetic layer on a substrate. The sublayer causes the Cr crystals to avoid growing with a predominantly (200) orientation. Because of this the magnetic layer will be isotropic in the film plane and independent of any texture or scratch marks in the substrate.

Abstract: A method for manufacturing a magnetic disk comprises the step of depositing a metallic layer on a glass substrate and laser texturing the metallic layer. The magnetic disk is then completed by deposition of (a) an underlayer such as Cr or sputtered NiP, (b) a magnetic layer such as a Co or Fe alloy, and (c) a protective overcoat such as ZrO.sub.2, carbon or hydrogenated carbon. By providing the above-mentioned metallic layer, laser texturing can now be used in conjunction with glass substrates.

Abstract: A method for manufacturing a magnetic disk comprises the steps of depositing NiP (20) on a substrate (22); depositing NiNb (24) on the NiP; and laser texturing the NiNb. "Sombrero" shaped texture features are more easily formed on the substrate/NiP/NiNb structure than a substrate/NiP structure. The disk is completed by depositing an underlayer (e.g. sputtered Cr or NiP), a magnetic layer (e.g. a Co alloy) and a protective overcoat (e.g. by hydrogenated carbon).

Abstract: A method for manufacturing a magnetic disk comprises the step of depositing a metallic layer on a glass substrate and laser texturing the metallic layer. The magnetic disk is then completed by deposition of (a) an underlayer such as Cr or sputtered NiP, (b) a magnetic layer such as a Co or Fe alloy, and (c) a protective overcoat such as ZrO.sub.2, carbon or hydrogenated carbon. By providing the above-mentioned metallic layer, laser texturing can now be used in conjunction with glass substrates.

Abstract: A magnetic disk storage medium (10) includes a smooth non-magnetic substrate (11) having surface roughened by sputter-depositing a continuous nonmagnetic rough thin film ("texture film") (14) over the substrate. The sputter conditions and composition of the texture film (14) are chosen to give a desired roughness and areal density of asperities. A sputtered adhesion layer (12) and/or a sputtered capping layer (15) are included to control the growth of the texture film and to improve its mechanical properties, respectively. A non-magnetic underlayer, a magnetic layer and a protective layer are then sputtered sequentially over the roughened substrate.

Abstract: A method for manufacturing a magnetic disk comprises the step of depositing a metallic layer on a glass substrate and laser texturing the metallic layer. The magnetic disk is then completed by deposition of (a) an underlayer such as Cr or sputtered NiP, (b) a magnetic layer such as a Co or Fe alloy, and (c) a protective overcoat such as ZrO.sub.2, carbon or hydrogenated carbon. By providing the above-mentioned metallic layer, laser texturing can now be used in conjunction with glass substrates.

Abstract: This patent teaches a new method of roughening the surface of a magnetic recording medium in order to reduce the stiction and friction between a recording head and the medium to thereby improve mechanical reliability. During this method, the medium substrate is heated to form second phase precipitates which result in roughening of the medium surface. The medium roughness can be controlled by proper selection of the heating temperature and time and the substrate alloy. This results in improved contact-start-stop (CSS) performance of the medium. The method of the present invention allows for lower costs and potentially higher throughput than conventional texturing processes.