Abstract: According to one embodiment, there is provided a magnetic head including a wave guide, a near field transducer, a writing magnetic pole, a magnetic core, a writing coil, and a first temperature control element. The near field transducer is disposed on an ABS surface and to which light is guided from the wave guide. The writing magnetic pole is disposed on the ABS surface. The magnetic core is connected to the writing magnetic pole so as to generate a magnetic field from a portion of the writing magnetic pole close to the ABS surface. The writing coil is disposed so as to go around the magnetic core. The first temperature control element is disposed in contact with a region of a first side surface of the wave guide near the near field transducer.

Abstract: According to one embodiment, there is provided a magnetic head including a wave guide, a near field transducer, a writing magnetic pole, a magnetic core, a writing coil, and a first temperature control element. The near field transducer is disposed on an ABS surface and to which light is guided from the wave guide. The writing magnetic pole is disposed on the ABS surface. The magnetic core is connected to the writing magnetic pole so as to generate a magnetic field from a portion of the writing magnetic pole close to the ABS surface. The writing coil is disposed so as to go around the magnetic core. The first temperature control element is disposed in contact with a region of a first side surface of the wave guide near the near field transducer.

Abstract: According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to produce a recording magnetic field perpendicular to a recording layer of a recording medium, a trailing shield located on the trailing side of the main pole with a write gap therebetween, a recording coil configured to produce a magnetic field in the main pole, and a nonmagnetic film containing a nonmagnetic material with a negative thermal expansion coefficient and disposed in the write gap between the trailing shield and a distal end portion of the main pole.

Abstract: According to one embodiment, a disk storage apparatus includes a magnetic head, a detector, a calculator, and a decision module. The magnetic head has a high-frequency assisted element disposed close to a main magnetic pole that generates a recording magnetic field for perpendicular magnetic recording, the high-frequency assisted element applying a high-frequency magnetic field onto a magnetic disk during data recording. The detector detects an electrical resistance of the high-frequency assisted element. The calculator calculates time axis data indicative of a variation, on a time axis, in the electrical resistance value detected by the detector. The decision module determines whether the high-frequency assisted elements is malfunctioning based on the time axis data.

Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.

Abstract: A female snap is provided with: a first member for at least partially establishing an opening into which a post is inserted; and a second member which is able to restrict expansion of the opening in order to either increase the force needed for engagement/disengagement, or prohibit engagement/disengagement, of the post with respect to the female snap. The extent of expansion of the opening that is permitted by the second member varies depending on the relative positions of a contracting part of the second member and a contacted part of the first member in a peripheral direction going around the direction of insertion of the post into the opening.

Abstract: According to one embodiment, a disk storage apparatus includes a magnetic head and a controller. The controller determines at regular intervals whether a recording density of a write signal belongs to a low-density region or a high-density region with reference to a reference density. In addition, the controller relatively reduces a current to energize a high-frequency-assisted element at a timing of the low-density region to be less than a current of the high-density region, in accordance with the low-density region or the high-density region in recording the data.

Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.

Abstract: According to one embodiment, a magnetic recording head includes a disk-facing surface, a main pole, a trailing shield, a first junction which connects the trailing shield and the main pole in a position off the disk-facing surface, a second junction which includes a high-frequency oscillator and connects the trailing shield and the main pole on side of the disk-facing surface, a leading shield on the leading side of the main pole, including a junction connected to the main pole in a position off the disk-facing surface with a third junction therebetween, and a connecting terminal configured to pass a current in series through the main pole, the nonmagnetic conductive layer, and the trailing shield. A thickness of the third junction is smaller than that of the first junction.

Abstract: A magnetic recording head includes a main magnetic pole generating a recording magnetic field, a trailing shield, a recording coil generating a magnetic field and a high frequency oscillator. The trailing shield includes a magnetic region including a gap side end surface facing a write gap and a nonmagnetic film arranged in the vicinity of the write gap in the trailing shield, and within a plane including track width direction centers of the main magnetic pole and the high frequency oscillator and being perpendicular to a recording layer of a recording medium, a film thickness of the nonmagnetic film along a track moving direction is substantially equivalent to or more than a half of a distance from the gap side end surface to the nonmagnetic film.

Abstract: According to one embodiment, a disk storage apparatus includes a magnetic head, a detector, a calculator, and a decision module. The magnetic head has a high-frequency assisted element disposed close to a main magnetic pole that generates a recording magnetic field for perpendicular magnetic recording, the high-frequency assisted element applying a high-frequency magnetic field onto a magnetic disk during data recording. The detector detects an electrical resistance of the high-frequency assisted element. The calculator calculates time axis data indicative of a variation, on a time axis, in the electrical resistance value detected by the detector. The decision module determines whether the high-frequency assisted elements is malfunctioning based on the time axis data.

Abstract: According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed on a substrate and including magnetic grains and a grain boundary formed between the magnetic grains, the grain boundary includes a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first and second grain boundaries suppresses thermal conduction.

Abstract: According to one embodiment, a magnetic recording head includes a main pole, a trailing shield opposing the main pole with a write gap therebetween, and a high-frequency oscillator between a distal end portion of the main pole and the trailing shield configured to produce a high-frequency magnetic field. The high-frequency oscillator includes a lower end surface facing the recording medium and an upper end surface substantially parallel to the lower end surface. The width of the lower end surface in a track-width direction is smaller than that of the upper end surface.

Abstract: According to one embodiment, in a magnetic disk, a reflecting layer with a higher reflectance to near-field light than a magnetic recording layer is provided in the magnetic recording layer so as to be flat. A magnetic head performs magnetic recording on the magnetic recording layer while locally heating the magnetic recording layer based on the near-field light.

Abstract: According to one embodiment, a main pole of a recording head includes a first magnetic pole layer and a second magnetic pole layer laminated on the trailing side of the first magnetic pole layer. The first magnetic pole layer includes a tapered portion and a first tip portion. The second magnetic pole layer includes a tapered portion and a second tip portion. A width in a track direction of the second tip portion is smaller than that of the first tip portion. The high-frequency oscillator is between the second tip portion and the trailing shield and includes a width in the track direction substantially equal to the width in the track direction of the second tip portion, and a height of the first tip portion is taller than that of the second tip portion.

Abstract: According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to generate a magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole opposite to a trailing side of the main pole with a gap, a coil configured to excite a magnetic flux in a magnetic circuit, and a high-frequency oscillator provided between a tip portion of the main pole on a side of the recording medium and the write shield magnetic pole to generate a high-frequency magnetic field. The write shield magnetic pole includes an end face opposite to the high-frequency oscillator and the end face is formed so that a distance from the main pole increases with an increasing distance from the recording medium.

Abstract: According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to generate a magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole opposite to a trailing side of the main pole with a gap, a coil configured to excite a magnetic flux in a magnetic circuit, and a high-frequency oscillator provided between a tip portion of the main pole on a side of the recording medium and the write shield magnetic pole to generate a high-frequency magnetic field. The write shield magnetic pole includes an end face opposite to the high-frequency oscillator and the end face is formed so that a distance from the main pole increases with an increasing distance from the recording medium.

Abstract: According to one embodiment, a magnetic recording head includes a disk-facing surface configured to face a recording layer of a recording medium, a main magnetic pole includes a distal end located on the disk-facing surface and configured to apply a recording magnetic field to the recording layer of the recording medium, a leading shield on a leading side of the main magnetic pole, opposed to the distal end of the main magnetic pole across a gap, a high-frequency oscillator between the leading shield and the distal end of the main magnetic pole, and a recording coil configured to excite the main magnetic pole with a magnetic field.

Abstract: According to one embodiment, a magnetic recording head includes a disk-facing surface configured to face a recording layer of a recording medium, a main magnetic pole includes a distal end located on the disk-facing surface and configured to apply a recording magnetic field to the recording layer of the recording medium, a leading shield on a leading side of the main magnetic pole, opposed to the distal end of the main magnetic pole across a gap, a high-frequency oscillator between the leading shield and the distal end of the main magnetic pole, and a recording coil configured to excite the main magnetic pole with a magnetic field.

Abstract: According to one embodiment, a magnetic recording head in a magnetic disk drive with a recording medium includes a magnetic core including a plurality of magnetic poles which form a closed magnetic path, and a recording coil wound around a part of the magnetic core and produces a magnetic field to the magnetic core. The magnetic core includes a write gap formed of a nonmagnetic material in a disk-facing surface of the recording head, a magnetic gap portion located at a position off from the disk-facing surface and magnetically isolated, and a nonmagnetic material in the at least one magnetic gap portion. The recording coil is wound around the nonmagnetic material in the magnetic gap portion.