Abstract: A head gimbals assembly for a hard disk for use in a thermally assisted magnetic disk recording medium, in which a laser diode is applied so as to record information with high density. The head gimbals assembly for a hard disk having a plurality of suspensions, each of which is provided with a magnetic head positioned adjacent to a corresponding disk surface among the disks so as to record/reproduce information; a head gimbals body having a centrally formed pivot hole which allows the head gimbals body to be fitted in such a manner as to be rotatable in relation to the disks, the suspensions extending from one end of the head gimbals body; a coil rotator provided at the other end of the head gimbals body so as to rotate the head gimbals body about the pivot hole; and a laser assembly having one or more laser diodes and one or more wave guides, the light emitted from any of the laser diodes is guided to a corresponding magnetic head by the wave guides.

Abstract: Provided is a method of increasing recording density and a control apparatus for increasing the recording density. The method includes applying a recording current corresponding to a recording signal to a magnetic head of a hard disc drive (HDD), and limiting a current value being applied to the magnetic head to a critical value when the recording current reaches the critical value. In the method, a rising time is reduced by using an overshoot recording current and the recording current is limited to a critical value when an actual recording current reaches the critical value. Thus, write track widths (WTWs) can be reduced at a low recording frequency, thereby increasing tracks per inch (TPI).

Abstract: An information recording medium, a method of manufacturing the information recording medium, a read/write head, and a method of manufacturing the read/write head are provided. The information recording medium includes magnetic recording layers formed of a ferromagnetic substance and electrical recording layers formed of a ferroelectric substance. The read/write head includes an electromagnetic write head including a main pole, a return pole magnetically connected to the main pole but electrically isolated from the main pole, a magnetic field applicator which applies a magnetic field to the main pole, and a voltage source which applies a bias voltage to the main pole; a magnetic read head provided an a side of the electromagnetic write head; and an electrical read head provided on an other side of the electromagnetic write head.

Abstract: A heat-assisted magnetic recording head and a recording apparatus including the same are provided. The heat-assisted magnetic recording head includes a recording portion which produces magnetic field for recording information to a magnetic recording medium, and a waveguide which transmits light therethrough disposed to be adjacent to the recording portion and which emits the light toward the magnetic recording medium, wherein the waveguide comprises a light incident surface; a tapered portion having progressively narrower sections along the transmission direction of the light incident on the light incident surface and entering the waveguide; and a light-emitting surface which emits the light after the light is transmitted through the tapered portion.

Abstract: Provided is a heat-assisted magnetic recording (HAMR) head gimbal assembly including a light source module including a light source emitting light, an HAMR head including a magnetic recording head including a recording pole for applying a magnetic recording field to a magnetic recording medium and a return pole magnetically connected with the recording pole to form a path of the magnetic field, and an optical transmission module which is formed on one side of the magnetic recording head and guides light incident from the light source module, a head slider including having a trailing edge whereon the HAMR head is formed, and a suspension attached to an end of an actuator arm, wherein the head slider is formed on an end of the suspension, and a sink part in which the light source module is installed and which is formed separated from the head slider, wherein the sink part is formed on a surface on which the head slider of the suspension is formed, and the light source module is formed on a surface on which the

Abstract: Disclosed is a head gimbals assembly for a hard disk for use in a thermally assisted magnetic disk recording medium, in which a laser diode is applied so as to record information with high density, and a method of assembling such a head gimbals assembly.

Abstract: Provided is a method of increasing recording density and a control apparatus for increasing the recording density. The method includes applying a recording current corresponding to a recording signal to a magnetic head of a hard disc drive (HDD), and limiting a current value being applied to the magnetic head to a critical value when the recording current reaches the critical value. In the method, a rising time is reduced by using an overshoot recording current and the recording current is limited to a critical value when an actual recording current reaches the critical value. Thus, write track widths (WTWs) can be reduced at a low recording frequency, thereby increasing tracks per inch (TPI).

Abstract: A light-coupling structure in a type of heat-assisted magnetic recording is provided, the structure not needing a separate additional slider or a suspension arm through reduction in variation amounts of coupling due to vibrations, and being realized as a high efficient, low-cost structure with compact size. The light-coupling structure in a type of heat-assisted magnetic recording (HAMR) includes: a waveguide having, at its one end, a mirror part inclined at a certain angle; a slider having one of a groove provided along a width direction of one side thereof contacting the waveguide and a via hole provided along a width direction of one side thereof contacting the waveguide; and a fiber butt-connected to the waveguide by means of a connector provided parallel with the slider.

Abstract: A heat-assisted magnetic recording head and a recording apparatus including the same are provided. The heat-assisted magnetic recording head includes a recording portion which produces magnetic field for recording information to a magnetic recording medium, and a waveguide which transmits light therethrough disposed to be adjacent to the recording portion and which emits the light toward the magnetic recording medium, wherein the waveguide comprises a light incident surface; a tapered portion having progressively narrower sections along the transmission direction of the light incident on the light incident surface and entering the waveguide; and a light-emitting surface which emits the light after the light is transmitted through the tapered portion.

Abstract: An information recording medium, a method of manufacturing the information recording medium, a read/write head, and a method of manufacturing the read/write head are provided. The information recording medium includes magnetic recording layers formed of a ferromagnetic substance and electrical recording layers formed of a ferroelectric substance. The read/write head includes an electromagnetic write head including a main pole, a return pole magnetically connected to the main pole but electrically isolated from the main pole, a magnetic field applicator which applies a magnetic field to the main pole, and a voltage source which applies a bias voltage to the main pole; a magnetic read head provided an a side of the electromagnetic write head; and an electrical read head provided on an other side of the electromagnetic write head.

Abstract: Provided is a perpendicular magnetic recording head for high density recording. The perpendicular magnetic recording head includes a coil, a return pole, a sub-yoke, and a main pole. The main pole has a pole tip including a second end surface that is spaced a predetermined distance from the return pole and faces the perpendicular magnetic recording medium, and surrounding at least a portion of the first end surface.