32results about "Recording by near-field interactions" patented technology

A magnetic head comprising a waveguide coupler for coupling incident electromagnetic (EM) radiation into a waveguide is disclosed. The waveguide coupler includes a bottom clad layer and a waveguide core layer formed above the bottom clad layer. An interface between the bottom clad layer and the waveguide core layer includes a first grating having a first period and a first etch depth, which are configured to couple a first portion of the incident EM radiation into the waveguide core layer. The waveguide coupler can further comprise a top clad layer formed above the waveguide core layer. An interface between the waveguide core layer and the top clad layer includes a second grating having a second period and a second etch depth. The second period and the second etch depth are configured to couple a second portion of the incident EM radiation into the waveguide core layer.

A thermally assisted magnetic head has a medium-facing surface facing a magnetic recording medium; a near-field light generator disposed on a light exit face in the medium-facing surface; a magnetic recording element located adjacent to the near-field light generator; and a light emitting element disposed so that emitted light thereof reaches the near-field light generator; the near-field light generator is comprised of a cusp portion and a base portion; when λin represents a wavelength of the emitted light from the light emitting element immediately before the emitted light reaches the near-field light generator, an intensity of near-field light generated when the material forming the cusp portion is irradiated with the light of the wavelength λin is stronger than an intensity of near-field light generated when the material forming the base portion is irradiated with the light of the wavelength λin.

A near field light generating device generating near field light from incident light by using a solid immersion mirror and a heat assisted magnetic recording head with the same are provided. The near field light generating device includes a light source; a waveguide core which transmits light; and a solid immersion mirror, which generates near field light, including an upper transmission surface through which light from the waveguide core is transmitted into the solid immersion mirror, a lower reflection surface, opposite the upper transmission surface, which reflections light incident thereon, lateral reflection surfaces, facing each other at sides of the solid immersion mirror, which reflect light incident thereon, and a lower transmission region disposed at a center of the lower reflection surface. Light reflected from the lateral reflection surfaces forms a light spot on the lower transmission region.

A thermally assisted magnetic head has a medium-facing surface facing a magnetic recording medium; a near-field light generator disposed on a light exit face in the medium-facing surface; a magnetic recording element located adjacent to the near-field light generator; and a light emitting element disposed so that emitted light thereof reaches the near-field light generator; the near-field light generator is comprised of a cusp portion and a base portion; when λin represents a wavelength of the emitted light from the light emitting element immediately before the emitted light reaches the near-field light generator, an intensity of near-field light generated when the material forming the cusp portion is irradiated with the light of the wavelength λin is stronger than an intensity of near-field light generated when the material forming the base portion is irradiated with the light of the wavelength λin.

A thermally assisted magnetic head includes a magnetic pole that generates a writing magnetic field from an air bearing surface (ABS); a waveguide through which light propagates; and a plasmon generator generating near-field light from a near-field light generating end surface by coupling the light thereto in a surface plasmon mode. The magnetic pole includes a convex part protruding in a substantially V-shape along a light propagation direction of the waveguide. The plasmon generator includes a substantially V-shaped part contacting the convex part, and as seen from a side of the ABS, a thickness of the plasmon generator in a direction perpendicular to convex part contacting sides gradually increases from an end in a direction away from the waveguide, the convex part contacting sides being linear sides that form the substantially V-shaped part of the plasmon generator and contacting the convex part.

A near-field light-generating element has a support member and a minute aperture having a size smaller than the wavelength of incident light provided on the support member so as to produce near-field light in response to incident light directed thereto. The minute aperture has a contour in a given plane with one side lying along a line perpendicular to a direction of polarization of the incident light and an opposite side in the given plane defining an apex.

A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.

An electromagnetic field generating element restrains magnetic field attenuation or magnetic field delay in a high frequency recording / reproducing head for thermally assisted magnetic field recording / reproduction using a near field. An information recording / reproducing head and an information recording / reproducing apparatus carry out high frequency magnetic recording / reproduction. The electromagnetic field generating element includes: (i) a substrate, (ii) conductors each provided on the substrate and each serving as a supporting section, (iii) a plate-like-shaped conductor provided on the conductors and (iv) a semiconductor laser element provided on the substrate. The semiconductor laser element irradiates laser light to the plate-like-shaped conductor substantially parallel to an extending flat surface of the plate-like-shaped conductor. This causes generation of a near field in the plate-like-shaped conductor. In addition, a magnetic field is generated by supplying a current to the plate-like-shaped conductor.

A near field light generating device generating near field light from incident light by using a solid immersion mirror and a heat assisted magnetic recording head with the same are provided. The near field light generating device includes a light source; a waveguide core which transmits light; and a solid immersion mirror, which generates near field light, including an upper transmission surface through which light from the waveguide core is transmitted into the solid immersion mirror, a lower reflection surface, opposite the upper transmission surface, which reflections light incident thereon, lateral reflection surfaces, facing each other at sides of the solid immersion mirror, which reflect light incident thereon, and a lower transmission region disposed at a center of the lower reflection surface. Light reflected from the lateral reflection surfaces forms a light spot on the lower transmission region.

A return path section includes a first yoke portion located on the front side in the direction of travel of a recording medium relative to a main pole and in contact with the top surface of the main pole. A coil includes a plurality of coil elements extending to pass between a core of a waveguide and the first yoke portion. The plurality of coil elements include a specific coil element. The main pole rides over the specific coil element.

A gap pull-in method and an optical disc apparatus. Whether light condensed on a disc as an actuator ascends is near-field light is determined using a gap error signal. The range of an actuator driving voltage value during a section where the decrease rate of the gap error signal is constant is obtained when it is determined that the light condensed on the disc is near-field light. Gap pull-in is performed on the disc during a section where the actuator driving voltage value is within the obtained range.

An optical head in which a graded index (GRIN) lens is provided. The optical head includes a slider connected to an arm and flying a predetermined distance above a recording layer for data recording, a GRIN lens mounted in the slider for focusing an incident beam to form a light spot of a predetermined size on its exit surface adjacent to the recording layer, and a light-emitting unit for emitting the incident light to the GRIN lens.

The invention relates to the technical fields of deep sub-micron and nano processing in the microelectronic technology, and discloses a microtip array device. The device is composed of a microtip array, a COMS control circuit unit and connection columns; the microtip array comprises a plurality of microtips, each microtip is mechanically and electrically connected with the COMS control circuit unit by a connection column; the COMS control circuit unit is used for controlling the microtips in the microtip array to operate independently; and the connection columns are used for realizing mechanical and electrical connection between the microtips and the COMS control unit in the microtip array. The invention further discloses a manufacturing method of the microtip array device. The COMS circuit controls metal tip field emission electron beams by the microtip array device and the manufacturing method to realize high-resolution nano-scale graphical processing and high-density data storage, and the problem of low operating efficiency of a single probe is solved by the microtip array.

A heat-assisted magnetic recording (HAMR) head for recording data in data tracks of a HAMR disk has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole formed of two layers. The first main pole layer has a cross-track width at the slider's gas-bearing surface (GBS) that tapers down in the direction towards the NFT where the optical spot is formed. The second main pole layer is located away from the NFT and has a substantially wider cross-track width than the first main pole layer so as to provide sufficient magnetic field for writing. Layers of heat sink material are located on the sloped cross-track sides of the tapered first main pole layer to reduce the temperature and thus the likelihood of oxidation of the main pole layers.

A heat-assisted magnetic recording medium includes a substrate, an underlayer, and a magnetic layer including an alloy having a L10 crystal structure and first and second layers, arranged in this order. Each of the first and second layers has a granular structure including C, SiO2, and BN at grain boundaries. Vol % of the grain boundaries in each of the first and second layers is 25 to 45 vol %. Vol % of C in the first layer is 5 to 22 vol %, and a volume ratio of SiO2 with respect to BN in each of the first and second layers is 0.25 to 3.5. Vol % of SiO2 in the second layer is greater than that of the first layer by 5 vol % or more. Vol % of BN in the second layer is smaller than that in the first layer by 2 vol % or more.

A thermally assisted magnetic head including a slider and a light source-unit. The slider includes a slider substrate and a magnetic head part. The light source-unit includes a laser diode and a sub-mount. The magnetic head part includes a medium-opposing surface, a light source-opposing surface and a waveguide which guides laser light from the light source-opposing surface to the medium-opposing surface. The thermally assisted magnetic head includes an optimal-structure which the following optimizing conditional expression, concerning an inlet-optical path length L1 of an inlet-interval of the waveguide, and an outlet-optical path length L2 of an outlet-interval, is satisfied,m1×L1=L2 (m1 is a natural number).

A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.

The invention is a kind of mask applied to the near field super-resolution optical storage which contains a metal organic compound layer. It includes a protection layer, a metal organic compound layer and a protection layer in order, the character lies in: the protection layer is made up of silicon nitride, or zinc sulfide, or the compound material of the zinc sulfide and the silicon dioxide; the metal organic compound layer is made up of four-cyano-group para-quinone dimethane silver, or four-cyano-group para-quinone dimethane copper, or four-cyano-group para-quinone dimethane aluminum, four-cyano-group para-quinone dimethane platinum, or four-cyano-group para-quinone dimethane gold. The reacting time is quick, the damage to the recording media and the base slice is small, and the near field light signal is stronge.

An optical storage unit consists of a light emitting and receiving device and a light-transmitting device. It features that light transmitting device has an input end and an output end, light emitting and receiving device set at input end of light transmitting device as its output end set with a microhole in diameter of 5 ¿C 70 nanometer.

The invention relates to the technical fields of deep sub-micron and nano processing in the microelectronic technology, and discloses a microtip array device. The device is composed of a microtip array, a COMS control circuit unit and connection columns; the microtip array comprises a plurality of microtips, each microtip is mechanically and electrically connected with the COMS control circuit unit by a connection column; the COMS control circuit unit is used for controlling the microtips in the microtip array to operate independently; and the connection columns are used for realizing mechanical and electrical connection between the microtips and the COMS control unit in the microtip array. The invention further discloses a manufacturing method of the microtip array device. The COMS circuit controls metal tip field emission electron beams by the microtip array device and the manufacturing method to realize high-resolution nano-scale graphical processing and high-density data storage, and the problem of low operating efficiency of a single probe is solved by the microtip array.

The invention relates approach field mode data recording and recovering method and its device. The invention injects approach field light onto the recording media to record and play data, the light generated by the light vibrating part and injected to the recording media makes the density of the approach field light to promote the temperature needed by recording or playing data, it uses different control method in light vibrating period and the vibration stop period, the temperature for recording or playing data in the recording media can upgrade the density of approach field light. The laser with different control part and the density set by the light control part can upgrade the temperature needed by disk recording layer, but it can decrease the temperature of the disk surface.

An information storage unit (10) operating in a vacuum includes a data storage medium (28) having information storage areas (30a, 30b) for storing and reading information thereon. An array of electron beam emitters (20) is spaced from but in close proximity to the data storage medium (28) for selectively directing a plurality of electron beams (21) towards the data storage medium (28). Focusing optics (25) between the array of electron beam emitters (20) and the data storage medium (28) focus each electron beam (21) onto a portion of the information storage area (30a, 30b) of the data storage medium (28) . The microelectromechanical motor comprises a stator wafer (14) with driving electrodes (42) and a rotor wafer (16) with driven electrodes (40), connected to a data storage medium (28) so that the data storage medium (28) is relative to the electronic The array of beam emitters (20) moves so that each emitter (20) selectively directs the electron beam (21) to a part of the information storage area (30b) to read and write information thereon.

The present invention relates to high density optical recording and playing method and device. Emitted light is made to pass through converging lens before irradiating the rotating CD to record or play information. The optical recording and playing method includes the following steps: forming the record layer in the contact surface to the converging lens of the center of the CD and forming protective layer on the record layer to form the contact surface record type CD configuration; and making the light through the converging lens irradiate the record layer of the contact surface record type CD to record or play back. The present invention can record or play back information on high density CD and protect the surface of CD effectively.

A light source and a waveguide are mounted on a recording head slider. Light rays are emitted from the light source into the waveguide. The waveguide may include two core layers for light ray transmission. The first core layer enhances light coupling efficiency from the light source to the second core layer. The second core layer transforms a profile of the light. The waveguide may include a tapered portion with a narrow opening near the light source and a wider opening near the tapered portion exit. The light rays passing through the waveguide may be directed toward a collimating mirror. The collimating mirror makes the light rays parallel or nearly parallel and re-directs the light rays to a focusing mirror. The focusing mirror focuses the collimated light rays to a spot on a magnetic media disc.

The invented optical storage media of the disorder nano composite film as well as the application belongs to the optical memory technique area. The media includes the first interval layer, the second layer and the structural layer of the disorder nano composite film between the first and second layers. The composite film contains the following components: the insulator with good transparency of the semiconductor with the wide energy gap as well as any one or more kinds of metal, semi-metal or semiconductor with the volume fraction 0.3-0.7. The two components are random distributed. The invention also discloses the structure of the erasable and read only optical disc made from the said media. The media possesses the effects of light amplification and super diffraction resolution so as to realize the super high-density optical storage with the features of high thermal stability, good transmittance, etc.

An optical storage unit consists of a light emitting and receiving device and a light-transmitting device. It features that light transmitting device has an input end and an output end, light emitting and receiving device set at input end of light transmitting device as its output end set with a microhole in diameter of 5 - 70 nanometer.