1067results about How to "Improve recording density" patented technology

The magnetic tape has a timing base servo pattern on the magnetic layer, wherein the centerline average surface roughness Ra on the surface of the magnetic layer is less than or equal to 1.8 nm, the magnetic layer contains a fatty acid ester, the full width at half maximum of spacing distribution measured by optical interferometry on the surface of the magnetic layer before and after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 7.0 nm, the difference of spacing measured by optical interferometry on the surface of the magnetic layer after and before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.

A refractive index nL and an attenuation rate kL of a magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a lengthwise direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RL during vertical incidence of the linearly polarized light in the lengthwise direction is obtained based on nL and kL. A refractive index nT and an attenuation rate kT of the magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a width direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RT during vertical incidence of the linearly polarized light in the width direction is obtained from nT and kT. If a variation rate A (%) of RL and RT is A=|RL / RT−1|×100, the relationship A≤10% is established.

A patterned perpendicular magnetic recording medium has magnetic islands that contain stacks of individual magnetic cells to provide multilevel recording. Each cell in an island is formed of a material or set of materials to provide the cell with perpendicular magnetic anisotropy and is a single magnetic domain. Each cell is magnetically decoupled from the other cells in its island by nonmagnetic spacer layers. Thus each cell can have a magnetization (magnetic moment) in one of two directions (into or out of the plane of the layer making up the cell), and this magnetization is independent of the magnetization of the other cells in its island. This permits multiple magnetic levels or states to be recorded in each magnetic island.

A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.

A hologram recording material is provided and includes at least a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof, and an interference fringe-recording component capable of recording interference fringes providing a refractive index modulation by an electron transfer or an energy transfer from the excited state, in which the sensitizing dye in the hologram recording material has a molar absorption coefficient within a range of 1 to 10,000 at the hologram recording wavelength.

A perpendicular magnetic recording medium 100 has, over a substrate, at least a magnetic recording layer 122 with a granular structure in which nonmagnetic grain boundaries are formed between magnetic grains continuously grown into a columnar shape. The magnetic grains of the magnetic recording layer 122 contain Co, Cr, and Pt. The magnetic recording layer 122 contains at least one oxide selected from a group A including SiO2, TiO2, and Cr2O3, at least one oxide selected from a group B consisting of oxides each having a larger Gibbs free energy ΔG than the group A, and a reducing agent adapted to reduce the oxides of the group B.

It is an object to manufacture magnetic recording media with the high recording density. Since nonmagnetic portions (8) with a predetermined pattern are formed in a recording auxiliary layer (4) formed on a magnetic recording layer (3), it is possible to actualize a magnetic recording medium where magnetic portions (7) and the magnetic recording layer (3) immediately below the portions (7) are recording units. The nonmagnetic portions (8) are formed by non-magnetization using ion implantation, and it is thereby possible to manufacture magnetic recording media with the high recording density.

A method for recording information on a recording medium utilizing an interference pattern by interference between an information light modulated spatially with digital pattern information displayed on a spatial light modulator having multiple pixels and a reference light for recording. In order to provide a novel recording method capable of enhancing the recording density and the transfer rate furthermore, digital information to be recorded is represented by match / mismatch of the attributes of adjacent pixels in the spatial light modulator to produce digital pattern information.

A data recording medium by which, when encoding a externally input AV signal to an MPEG transport stream, the MPEG_TS can be quickly and efficiently converted to an MPEG program stream conforming to a DVD standard, is provided. An apparatus and method for recording to the data recording medium are also provided. A flag indicating that a first stream (such as an MPEG transport stream) is recorded in a constraint format enabling efficient conversion to a second stream (such as an MPEG program stream) is written to the management information (VOBI). By referencing this flag the recorder can easily determine if the recorded data was recorded in the specified constraint format without analyzing the data recorded to the data recording medium.

A perpendicular magnetic recording medium comprises a magnetic recording layer that records a signal, an underlayer formed of Ru or Ru compound below the magnetic recording layer, a non-magnetic layer formed of a non-magnetic material below the underlayer to control crystal orientation of the underlayer, a soft magnetic layer provided below the non-magnetic layer, and a substrate on which the magnetic recording layer, the underlayer, the non-magnetic layer, and the soft magnetic layer are formed. The non-magnetic layer comprises a first non-magnetic layer formed above the soft magnetic layer and a second non-magnetic layer formed above the first non-magnetic layer. The first non-magnetic layer is formed of amorphous Ni compound while the second non-magnetic layer is formed of crystalline Ni or crystalline Ni compound.

A perpendicular magnetic recording medium includes a magnetic recording layer 22 having a granular structure composed of crystal grains containing cobalt (Co) and grown in a columnar shape and a grain boundary portion comprising a nonmagnetic substance and formed between the crystal grains, and a continuous layer 24 of a thin film magnetically continuous in a film plane direction. The continuous layer 24 includes a plurality of layers 24a and 24b containing cobalt, chromium (Cr), and platinum (Pt). Among the layers, the layer 24a nearer to the magnetic recording layer has a greater chromium content.

A characteristic evaluation method of a perpendicular magnetic recording medium suitable for obtaining a perpendicular magnetic recording medium which can respond to much higher recording density is provided.This is an evaluation method of a perpendicular magnetic recording medium, including a process of recording a first signal of a specific frequency at an arbitrary first position in the perpendicular magnetic recording medium; a process of measuring a reproduction output of the first signal and of measuring a signal / noise ratio (initial value) of the first signal at a peak position where the reproduction output becomes the maximum; a process of recording a signal of a specific frequency at a second position away from the first position by a predetermined distance in the radial direction of the perpendicular magnetic recording medium; a process of measuring the signal / noise ratio of the first signal at the peak position again; a process of repeating the process of recording the signal of the specific frequency at a position brought close to the first position from the second position by a predetermined distance and of measuring the signal / noise ratio of the first signal at the peak position again while sequentially getting closer to the first position from the second position; and a process of determining whether the value of the signal / noise ratio has lowered from the initial value by a predetermined range or more.

A magnetic recording apparatus and method for the azimuthal recording of data to and from data storage tracks contained on digital linear tape. The magnetic recording apparatus includes a magnetic data recording head assembly. A magnetic recording head is centrally located within the magnetic data recording head assembly. The magnetic data recording head assembly includes a control device coupled to a left servo sensor, wherein the left sensor is located to the left of and external to the magnetic recording head. The magnetic recording apparatus additionally includes a control device coupled to a right servo sensor, wherein the right servo sensor is located to the right of and external to the magnetic recording head. The left and right servo sensors assist the magnetic recording head to tilt and rotate at a predetermined angle with respect to a particular data storage track contained on a digital linear tape, during a recording operation, thereby increasing recording density and providing improved azimuthal recording.

[PROBLEMS] To provide a process for producing a magnetic recording medium, which can simultaneously realize increased high recording density, high impact resistance, and prevention of corrosion, by providing an underlayer which, even when formed at a low gas pressure, can exhibit a high level of coercive force.[MEANS FOR SOLVING PROBLEMS] A process for producing a perpendicular magnetic recording medium, comprising the step of forming a nonmagnetic underlayer (18) having a granular structure, in which crystal particles are grown in a column form, on a substrate, and forming a magnetic recording layer (20) having a granular structure in which magnetic particles are grown in a column form. The process is characterized in that the underlayer (18) is any one of CoCr or CoCrX (wherein X is a nonmagnetic material), CoCr-oxide, and CoCrX-oxide, and the film forming gas pressure of the underlayer (18) is not more than 4 Pa.

[Summary][Problem] An object is to provide a perpendicular magnetic recording medium in which a narrower track width is achieved by enhancing an exchange coupling magnetic field Hex of a soft magnetic layer so that a higher recording density can be achieved.[Solution] A perpendicular magnetic recording medium according to the present invention is configured to include a magnetic recording layer 122 that records a signal, and a soft magnetic layer 114 provided below the magnetic recording layer, on a base 110 on a main surface of which textures are formed, wherein the textures includes first textures 110a that is linear rails in a certain direction, and second textures 110b that are trails intersecting at a predetermined angle with the first textures; and the angle of intersection between the first textures and the second textures is 10° or less.

A magnetic disk 10 for use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate 1. The magnetic recording layer is composed of a ferromagnetic layer 5 of a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layer 7 having a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layer 6 interposed between the ferromagnetic layer 5 and the stacked layer 7. After forming the ferromagnetic layer 5 on the substrate 1 by sputtering in an argon gas atmosphere, the stacked layer 7 is formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer 5.

A process for producing a magnetic recording medium comprising: unrolling a flexible polymer substrate from a feed roll; forming a magnetic layer on at least one side of the flexible polymer substrate by a vacuum film forming method in a film forming chamber; and taking up the flexible polymer substrate on a take-up roll, wherein at least one of the feed roll and the take-up roll is replaced while maintaining a vacuum state for forming the magnetic layer in the film forming chamber.