Abstract: The present disclosure discloses a magnetic head, a head gimbal assembly, a hard disk drive, and a method for processing a magnetic head. The method comprises irradiating at a fixed point proximal to the read/write part with a laser irradiation device until the read head and the write head are thermally expanded; orientating air bearing surfaces of a plurality of magnetic heads forming a magnetic strip toward a lapping surface of a lapping device after laser irradiation, holding the air bearing surfaces in place, lapping with the lapping device until the air bearing surfaces are coplanar; and disassembling the magnetic strip to obtain a lapped magnetic head. Through laser heating induced compensation, the heights of lapped read head and write head of the magnetic head meet their respective target values, ensuring the normal reading and writing of the storage medium of the magnetic disk.

Abstract: The laser diode includes an electrode pad layer, being connected to an electrode, and an outer surface in which the electrode pad layer is formed. The electrode pad layer includes a solder-bonding pad part and a solder-contact preventing part. The solder-contact preventing part is formed with small wettability material having solder wettability which is smaller than solder wettability of the solder-bonding pad part. The solder-bonding pad part and the solder-contact preventing part are formed so that a pad height, being a height from the outer surface to a surface of the solder-bonding pad part, is larger than a preventing height, being a height from the outer surface to a surface of the solder-contact preventing part.

Abstract: A semiconductor laser includes an active layer which emits laser light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions. The laser radar device includes a light projection part which projects laser light and a light receiving part which receives reflected light of the laser light. The light projection part includes the semiconductor laser and a scanner which reflects the laser light, emitted from the semiconductor laser, to form a scanning laser light.

Abstract: A semiconductor laser includes an active layer which emits laser light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions. The laser radar device includes a light projection part which projects laser light and a light receiving part which receives reflected light of the laser light. The light projection part includes the semiconductor laser and a scanner which reflects the laser light, emitted from the semiconductor laser, to form a scanning laser light.

Abstract: A light source-unit includes a laser diode, a sub-mount which the laser diode is joined. The laser diode includes an optical generating layer including an active layer which emits laser-light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions.

Abstract: A thermally assisted magnetic recording head and a thermally assisted magnetic recording disk drive are disclosed. The thermally assisted magnetic recording head includes a slider body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is provided on the slider body, the laser is provided on the laser substrate, and the magnetic head is provided at a front end of the slider body. The magnetic head includes an optical waveguide facing the laser. The angle between a light incident surface of the optical waveguide and an incident direction of a laser light incident on the optical waveguide is less than 90 degrees. The thermally assisted magnetic recording disk drive includes a plurality of magnetic disks and a magnetic head suspending frame. A front end of the magnetic head suspending frame is provided with the thermally assisted magnetic recording heads mentioned above.

Abstract: A thermally assisted magnetic recording head and a thermally assisted magnetic recording disk drive are disclosed. The thermally assisted magnetic recording head includes a slider body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is provided on the slider body, the laser is provided on the laser substrate, and the magnetic head is provided at a front end of the slider body. The magnetic head includes an optical waveguide facing the laser. The angle between a light incident surface of the optical waveguide and an incident direction of a laser light incident on the optical waveguide is less than 90 degrees. The thermally assisted magnetic recording disk drive includes a plurality of magnetic disks and a magnetic head suspending frame. A front end of the magnetic head suspending frame is provided with the thermally assisted magnetic recording heads mentioned above.

Abstract: A row bar for forming magnetic heads includes a row of magnetic head forming portions each having a magnetic head and a cutting portion adjacent to the magnetic heads. A row of bonding pads and a first ELG pad are provided at the magnetic head, a second ELG pad is provided at the cutting portion, both of the first and the second ELG pads are adapted for contacting with a probe during lapping process, and a conductive structure that is higher than surfaces of the first and the second ELG pads is formed at peripheries of the first and the second ELG pads respectively. Due to the conductive structures, a probe used in lapping process will be prevented from shifting from the ELG pads to ensure a stable contact, thereby obtaining efficient and accurate resistance measurement.

Abstract: A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.

Abstract: A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.

Abstract: A coupling structure of optical components has a first optical component, a second optical component and a coupling solder layer. The first optical component has a lensed fiber, a first holder holding the lensed fiber and a first metal layer formed on a first connecting end face of the first holder. The second optical component has a waveguide, a second holder holding the waveguide and a second metal layer formed on a second connecting end face of the second holder. The coupling solder layer is in direct contact with both of the first metal layer and the second metal layer, and formed with solder.

Abstract: A coupling structure of optical components has a first optical component, a second optical component and a coupling solder layer. The first optical component has a lensed fiber, a first holder holding the lensed fiber and a first metal layer formed on a first connecting end face of the first holder. The second optical component has a waveguide, a second holder holding the waveguide and a second metal layer formed on a second connecting end face of the second holder. The coupling solder layer is in direct contact with both of the first metal layer and the second metal layer, and formed with solder.

Abstract: A row bar for forming magnetic heads includes a row of magnetic head forming portions each having a magnetic head and a cutting portion adjacent to the magnetic heads. A row of bonding pads and a first ELG pad are provided at the magnetic head, a second ELG pad is provided at the cutting portion, both of the first and the second ELG pads are adapted for contacting with a probe during lapping process, and a conductive structure that is higher than surfaces of the first and the second ELG pads is formed at peripheries of the first and the second ELG pads respectively. Due to the conductive structures, a probe used in lapping process will be prevented from shifting from the ELG pads to ensure a stable contact, thereby obtaining efficient and accurate resistance measurement.

Abstract: A manufacturing method for a head slider coated with Diamond-like Carbon (DLC) includes: providing a substrate that is to be finally made into a head slider; depositing a DLC layer on a surface of the substrate, with carbon plasma source being sputtered in a direction that is vertical to the surface of the substrate; and doping a fluorine-doping (F-doping) layer on the DLC layer. Whereby the head slider has good film adhesion performance, higher hardness, better wear resistance, lower surface energy to obtain good hydrophobicity and oleophobicity, and lower fly height in HDD.

Abstract: A manufacturing method for a head slider coated with Diamond-like Carbon (DLC) includes: providing a substrate that is to be finally made into a head slider; depositing a DLC layer on a surface of the substrate, with carbon plasma source being sputtered in a direction that is vertical to the surface of the substrate; and doping a fluorine-doping (F-doping) layer on the DLC layer. Whereby the head slider has good film adhesion performance, higher hardness, better wear resistance, lower surface energy to obtain good hydrophobicity and oleophobicity, and lower fly height in HDD.

Abstract: A thermal assisted magnetic recording head has a magnetic head slider and a light source unit that is fixed to the magnetic head slider. A first surface of the light source unit and a second surface of the magnetic head slider face each other via a gap. The light source unit includes a light source that emits laser light from an emission part that is positioned on the first surface and a photodetector that detects the laser light. The magnetic head slider includes a waveguide through which the laser light that is incident on an incident part positioned on the second surface propagates, near-field light generation means for generating near-field light on an air bearing surface, the near-field light being generated from the laser light that propagates through the waveguide, and a recording magnetic pole that is provided adjacent to the near-field light generation means and that has an end part positioned on the air bearing surface.

Abstract: A light source unit has a substrate, a light source that is mounted to the substrate. The light source includes; a first emission part that emits a forward light, the forward light being a laser light in an oscillation state; a second emission part that is located on a side opposite to the first emission part and that emits a rearward light, the rearward light being a laser light in an oscillation state; and a light leakage part located at a position different from the first emission part and the second emission part. The light source further includes a photodetector that is provided on the substrate, wherein the photodetector has a light receiving surface for detecting a leakage light that leaks from the light leakage part.

Abstract: A thermally assisted magnetic head (TAMH) slider having an air bearing surface and a back surface opposite the air bearing surface, which includes a slider substrate, a magnetic head portion configured on the slider substrate and having a waveguide formed therein, a semiconductor surface emitting laser configured on the back surface with an emitting surface facing the back surface; and a lens configured between the semiconductor surface emitting laser and the waveguide for focusing lights emitted from the semiconductor surface emitting laser on an incident end of the waveguide. The TAMH slider has stable performance, and can rapidly write data to a magnetic recording medium with high recording density.

Abstract: A method of testing a TAMH includes providing a slider body having a waveguide embedded therein with an incidence end extending toward a back surface of the slider body; providing a light source unit including a light source and a unit substrate; coating a bonding material layer on the back surface, under the bottom, or both on the back surface and under the bottom of the unit substrate; coating a localization material layer on the back surface; aligning the light source unit to the slider body; causing a light emitted from the light source and allowed to be incident on the incidence end to anneal the localization material layer to generate an annealing mark; removing the light source unit or the light source from the slider body; and measuring a position offset between the annealing mark and the incidence end. The method can evaluate alignment accuracy of a slider body and a light source unit in two dimensional directions.

Abstract: A thermally assisted magnetic recording head slider includes a light source unit having a light emitting element emitting laser light and a submount holding the light emitting element, and slider including a thin-film laminated part having a main magnetic pole layer, a near-field light generating element and an optical waveguide. A combination of the light emitting element and near-field light generating element is composed of a first pattern or second pattern. The light source unit is mounted on a light source placing surface so that a substrate surface of the light emitting element is orthogonal to a laminated surface of the thin-film laminated part. A plurality of electrode pads are formed on the outer end surface of the slider. The light source unit has a first element electrode and second element electrode.