1963results about "Record carriers manufacture" patented technology

A method of manufacturing a magnetoresistive-based device having magnetic material layers formed between a first electrically conductive layer and a second electrically conductive layer, the magnetic materials layers including a tunnel barrier layer formed between a first magnetic materials layer and a second magnetic materials layer, including removing the first electrically conductive layer and the first magnetic materials layer unprotected by a first hard mask, to form a first electrode and a first magnetic materials, respectively; and removing the tunnel barrier layer, second magnetic materials layer, and second electrically conductive layer unprotected by the second hard mask to form a tunnel barrier, second magnetic materials, and a second electrode.

Methods and apparatus are provided for making an optically readable media unreadable. The method includes steps of (a) providing the media with an optically activated mechanism that degrades the reflectivity of a surface wherein information is encoded; (b) exposing the media to optical radiation for reading out the information; and, during the step of exposing, (c) initiating the operation of the optically activated mechanism. In this embodiment the step of initiating includes steps of (d) generating singlet oxygen in a layer disposed on the media; and (e) reacting the singlet oxygen with a metal-containing layer for oxidizing the surface of the metal-containing layer, thereby degrading the reflectivity of the surface. In a further aspect the optically activated mechanism causes a defocusing of a readout beam, thereby degrading reflection of the readout beam from a surface wherein information is encoded. In another embodiment the method deforms a surface of the layer resulting in readout beam aberration or in an inability to correctly stay on track. In another embodiment a portion of the surface is removed to the atmosphere, such as by evaporation of sublimation. In this embodiment a layer of the media is comprised of a volatile component and at least one other component. Removing at least some of volatile component by evaporation or sublimation causes an increase in at least one of photoabsorption or scattering or surface roughness with the remaining component, thereby rendering at least a portion of encoded information of the media unreadable, or affecting the tracking operation.

A method and system for providing a magnetic element and a magnetic memory utilizing the magnetic element are described. The magnetic element is used in a magnetic device that includes a contact electrically coupled to the magnetic element. The method and system include providing pinned, nonmagnetic spacer, and free layers. The free layer has an out-of-plane demagnetization energy and a perpendicular magnetic anisotropy corresponding to a perpendicular anisotropy energy that is less than the out-of-plane demagnetization energy. The nonmagnetic spacer layer is between the pinned and free layers. The method and system also include providing a perpendicular capping layer adjoining the free layer and the contact. The perpendicular capping layer induces at least part of the perpendicular magnetic anisotropy in the free layer. The magnetic element is configured to allow the free layer to be switched between magnetic states when a write current is passed through the magnetic element.

A method and system for providing a magnetic structure that includes at least one magnetic material is disclosed. The method and system include defining the magnetic structure. The magnetic structure also includes a top layer that is insensitive to an istroropic carbonyl reactive ion etch. The defining of the magnetic structure results in at least one artifact. The method and system further includes cleaning the at least one artifact using at least one isotropic carbonyl reactive ion etch.

Perpendicular magnetic anisotropy and Hc are enhanced in magnetic devices with a Ta / M1 / M2 seed layer where M1 is preferably Ti, and M2 is preferably Cu, and including an overlying (Co / Ni)X multilayer (x is 5 to 50) that is deposited with ultra high Ar pressure of >100 sccm to minimize impinging energy that could damage (Co / Ni)X interfaces. In one'embodiment, the seed layer is subjected to one or both of a low power plasma treatment and natural oxidation process to form a more uniform interface with the (Co / Ni)X multilayer. Furthermore, an oxygen surfactant layer may be formed at one or more interfaces between adjoining (Co / Ni)X layers in the multilayer stack. Annealing at temperatures between 180° C. and 400° C. also increases Hc but the upper limit depends on whether the magnetic device is MAMR, MRAM, a hard bias structure, or a perpendicular magnetic medium.

The systems, methods and products of the invention include systems and methods for manufacturing servo tracks on a magnetic tape. In one aspect, the invention includes systems for manufacturing magnetic tapes having servo tracks thereon wherein the servo tracks are optically detectable and are capable of being processed by a servo control system for maintaining alignment of a magnetic recording head with the data tracks on the recording side of the magnetic tape. In one practice, the manufacturing systems described herein engrave the servo tracks onto the non-recording side of a magnetic tape by directing a laser beam at the non-recording side of the magnetic tape. In another practice, the manufacturing systems described herein engrave the servo tracks onto the magnetic side of a magnetic tape by directing a laser beam at the magnetic side of the magnetic tape. Such engraved patterns can act as optical servo tracks for maintaining alignment of the recording head with the data tracks on the magnetic tape.

Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio is 0.65 to 1.00, one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide is contained in a magnetic layer side portion on the non-magnetic support, a C—H derived C concentration of the magnetic layer is 45 atom % to 65 atom %, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.

Provided are a magnetic recording medium, in which a magnetic layer includes ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic recording medium is 0.65 to 1.00, a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.

The magnetic tape device including: a magnetic tape; and a servo head, in which the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.

A magnetic recording medium including a magnetic layer 93 containing ferromagnetic powder and a binder, a support 91, and a backcoat layer 94, provided in this order, and being obtained by slitting to width a magnetic material of broad width and continuous length. The magnetic recording medium has no ridge protruding above the surface plane of the magnetic layer along the slit edge thereof. The magnetic recording medium achieves large recording capacity, is free from the tape pack problems such as appearance of a radial pattern and the output reduction problem, produces no fine scrapings in high speed running, which would cause head clogging and dropouts, thereby exhibiting good running durability and electromagnetic characteristics, and is particularly useful for computer data storage applications.

An apparatus and method for aligning a disk with an imprinting surface are described. In one embodiment, the apparatus has a die which includes an air-bearing mandrel having a tapered nose to engage an ID of the disk, a circular imprinting surface having a centerline concentric with the air-bearing mandrel, and an air-bearing cavity to position the disk. The axial movement of the top die towards the bottom die guides the ID of the disk into coincident alignment with the centerline of the top die.

A magnetic recording medium comprising a substrate and a magnetic layer containing ferromagnetic metal powder and a binder, wherein the ferromagnetic metal powder contains iron, cobalt and form 2 to 20 atom % of yttrium based on a total of iron and cobalt contained in the ferromagnetic metal powder and has an average length of 50 nm or smaller, and the magnetic recording medium has a test value of at least 100 passes in a magnetoresistive head resistance reduction test performed as defined herein.

The present invention provides an optical recording medium which incorporates an inorganic based recording layer which has a high reflectance, sufficient for reproduction compatibility on devices such as CD-ROM drives, as well as a high degree of modulation between the state prior to recording and that after recording, as well as an information recording method therefor. Accordingly, an optical recording medium comprises a substrate (2) which is substantially transparent with respect to a recording light beam and a reproduction light beam, a first recording layer (3) which is layered on top of the substrate (2) and which incorporates as the main constituent a metal which has a low melting point and a high reflectance, and a second recording layer (4) which is layered on top of the first recording layer (3) and which will, due to heat generated from irradiation of a light beam through the substrate (2), either mix, or alternatively react, with the first recording layer (3) to form an alloy of low reflectance as well as forming irregularities or pitting in the surface, thereby enabling the recording of information. Due to the heat generated from irradiation of a recording light beam through the substrate (2) the first recording layer (3) and the second recording layer (4) are either mixed, or alternatively reacted to form an alloy as well as forming irregularities or pitting in the surface, thereby recording information.

Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110) / Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.

An optical disk comprises a disk substrate having a hub and an annular optical metallicized data region extending radially outward from the hub. The optical disk further comprises a radio frequency identification (RFID) transponder affixed to the disk substrate, e.g., within the non-data containing hub region. The optical disk further comprises at least one linear antenna element coupled to the transponder, e.g., via pole lead(s), and extending within the data region. The antenna element(s) can be applied to the disk substrate as a patterned antenna layer over a metallicized data region, and can be electrically isolated from the data region. A method and system of identifying an optical disk is provided. A radio frequency (RF) signal can be transmitted to the optical disk at a range of at least five feet, and preferably at a range of at least ten feet. An RF signal with an identification code (e.g., a unique number) can be received from the optical disk in response to the transmitted RF signal. The activating RF signal can be transmitted by, and the identification RF signal can be received by, e.g., a handheld RF reader or an RF reader that is affixed to a building. The identification code can then be processed for many purposes, such as identifying the optical disk as a non-counterfeited optical disk, calculating a royalty, or tracking the location of the optical disk.

A radio frequency identification (RFID) system for discs such as CDs, DVDs or minidiscs includes a special RFID transponder and antenna configuration. The discs normally include an outer metallized annular zone where information is stored, a central hole, and an inner annular zone between the hole and the outer annular zone. The transponder may be located in the inner annular zone, with antenna elements coupled to the transponder extending in opposite directions part way across the outer annular zone. Multilayer labels with a recess for the transponder chip, and antenna elements formed by conductive material may be employed to apply the RFID assembly to the discs. A monopole or dipole mode of antenna operation, prominently involving the metallized disc layer, results from the antenna configuration, and serves to more than double the range of the system.

An information recording medium and a supporter used for the information recording medium capable of recording a land / groove recording by using a high density recording technique such as a super-resolution, resulting in a high density recording. An information recording medium B has a supporter 1A, on which a recording layer 5 is formed. On the supporter 1A, lands 2 and groove 3 are alternately formed as a minute track pattern. A crevice 4 having a depth Dc larger than a depth Dg of the respective grooves 3 is formed in the respective grooves 3 at one end of the respective grooves 3 in a width direction of the respective grooves.

Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110) / Int(114) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, the back coating layer includes one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %.

The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, a center line average surface roughness measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°.

A double-sided optical disc, is formed with data tracks on each layer. The tracks on one side follow one spiral while the tracks on the other side follow a second spiral, the two spirals being oriented in opposite directions as viewed from the respective sides, and therefore being mirror images of each other. This allows data to be read by a player seamlessly from both sides of the disc without changing the direction of rotation of the disc.

A memory IC includes a first substrate (substrate on the transfer destination side), and memory cell arrays deposited on the first substrate. The memory cell arrays are deposited from the bottom up by a method for transferring a thin film configuration. The transferring method includes the steps of forming a thin film device layer (memory cell array) on a second substrate with a separable layer therebetween, and irradiating the separable layer with light to cause a separation in the separable layer and / or at an interface so that the thin film device layer on the second substrate is transferred to the first substrate.

The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the hack coating layer is equal to or smaller than 0.060.

Provided are a magnetic tape including: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.

A high-density optical recording medium and method of recording data on the optical recording medium. The optical recording medium includes a plurality of data recording / reproducing surfaces having reflectances for light passing through a pit area, a land / groove area, and a land / groove area on which data are recorded, of a data recording / reproducing surface included between a light source for emitting light and a recording / reproducing surface selected from the plurality of data recording / reproducing surfaces, the reflectances satisfy the expressions r1≧r2≧r3 and {(r1−r3) / r3}≦0.2, where r1, r2 and r3 are the reflectances of the pit area, the land / groove area and the land groove area on which data are recorded, respectively.

[Problems] To provide a reinforcing layer between a main recording layer and a continuous layer so as to improve the S / N ratio of a magnetic recording medium and reduce the write fringing effect by the new configuration.[Means for Solving Problems] A perpendicular magnetic recording medium (100) includes a substrate (110), and a main recording layer (122), a reinforcing layer (124), and a continuous layer (126) which are overlaid in this order on the substrate. The reinforcing layer (124) has a granular structure. The saturation magnetization Ms of the reinforcing layer (124) is higher than the saturation magnetization of the main recording layer (122).

A perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, a pre-underlayer, an underlayer, and a main recording layer serving as a magnetic recording layer. The pre-underlayer contains seed crystal grains that serve as a base for crystal grains of the underlayer, and an addition substance that is added between the seed crystal grains and composed of an element having an atomic radius smaller than that of an element forming the seed crystal grains.