Tdk Corporation

Headway Technologies, Incorporated

Other

Sae Magnetics (h.k.) Limited

Tokyo Magnetic Printing Co., Ltd.

Tsutomu Chou

Koji Shimazawa

Shinji Hara

Eiji Komura

Yoshihiro Tsuchiya

Daisuke Miyauchi

Kosuke Tanaka

Hironobu Matsuzawa

Takahiko Machita

Susumu Aoki

Tetsuya Roppongi

Seiichi Takayama

Tomohito Mizuno

Hayato Koike

Ryo Hosoi

Masahiro Ito

Xuhui Jin

Tsuneo Suzuki

Hideharu Moro

Tobias Maletzky

Masao Shigeta

Toshiyuki Ayukawa

Takahiko Izawa

Shohei Mimura

Cherng-Chyi Han

Kei Hirata

Kiyoshi Noguchi

Chikara Ishizaka

Katsuki Kurihara

Yasutoshi Fujita

Weihao Xu

Takafumi Kobayashi

Takeshi Tsutsumi

Yiming Wang

Katsuhiko Wakayama

Kazuhiko Shibata

Yasuhiko Kitajima

Masahiro Karatsu

Kouji Shimazawa

Takashi Nagasaka

Junetsu Tamura

Yasuhiro Ito

Makoto Yoshida

Nobuyuki Mori

Osamu Shinoura

Matteo Staffaroni

Yasuo Hashimoto

Gouichi Nishizawa

Makoto Isogai

Hiroshi Chihara

Hideki Tanzawa

Mitsuo Otsuki

Tsutomu Koyanagi

Tomihito Mizuno

Eijii Komura

Masatoshi Hatakeyama

Jyunetsu Tamura

Sadaki Sato

Mari Fujii

Katsumi Saito

A TAMR (thermally assisted magnetic recording) write head uses a gap-based NFT (near-field transducer) to create plasmon near field energy. In one embodiment the NFT is a double ridge aperture structure that simultaneously delivers low transition curvature and better cross-track thermal gradients than previous designs. In another embodiment a NFT comprises a top and bottom ridge not confined to an aperture structure, made of thermo-mechanically stable materials and a parabolic shaped metal layer disposed adjacent to a dielectric waveguide core to couple optical energy to surface plasmon modes.

Double ridge near-field transducers

A method for manufacturing a TAMR (thermal assisted magnetic recording) write head. The write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.

Method for manufacturing thermally-assisted magnetic recording head with waveguide blocker

A plasmon generator generates surface plasmon and generates near-field light from the surface plasmon at a distal end surface situated on an air bearing surface facing a magnetic recording medium. The plasmon generator has a first portion including the distal end surface, a second portion situated away from the air bearing surface, and a separating layer situated between the first portion and the second portion and separating the first portion from the second portion.

Plasmon generator with separating layer for thermal assisted magnetic recording head

A laser annealing method that includes forming a second layer having through holes on a first layer, and radiating laser light with a wavelength of 3 &#x3bc;m or greater to the first layer via the through holes.

Method for laser annealing with laser beam radiated via through hole

A TAMR (thermal assisted magnetic recording) write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.

Plasmon generator with metallic waveguide blocker for TAMR

A thermally assisted magnetic recording head includes core that propagates laser light as propagation light, a near-field light generator that faces a portion of the core and extends to an air bearing surface (ABS), the near-field light generator coupled to the propagation light propagating through the core so as to generate a surface plasmon, propagating the surface plasmon to an end part facing the ABS, and generating near-field light at the end part to irradiate the near-field light to a magnetic recording medium, a main magnetic pole layer provided in the vicinity of the near-field light generator where an end part is positioned on the ABS, a laser diode that generates laser light of wavelength 890 nm to 1,000 nm and enters the laser light into the core, and a photodiode provided on a silicon substrate measures an intensity of the laser light entering from the laser diode to the core.

Thermally assisted recording head utilizing laser light with limited wavelength range

A thermally assisted magnetic recording head has a generator end surface facing an air bearing surface (ABS), and includes: a near-field light (NF light) generator that generates an NF light on the generator end surface and irradiates a magnetic recording medium with the NF light, and a main magnetic pole end surface positioned in the vicinity of the generator end surface; a main magnetic pole that emits a magnetic flux from the main magnetic pole end surface to the magnetic recording medium and a shield end surface positioned in the vicinity of the generator end surface; and a return shield that is magnetically linked to the main magnetic pole, and that absorbs the magnetic flux returning from the magnetic recording medium at the shield end surface. The main magnetic pole and the return shield are positioned to be on the same side with respect to the NF light generator in the down track direction, and the NF light generator does not overlap with the main magnetic pole either in the down track direction or in the cross track direction.

Thermally assisted magnetic recording head with main magnetic pole apart from near field light generator

Thermally-assisted magnetic recording head, includes: a magnetic pole having an end exposed on an air-bearing surface; a waveguide; a plasmon generator having a first and second region, first region extending backward from the air-bearing surface to a first position, second region being coupled with the first region at the first position, extending backward from first position, and having a width in a track-width direction, and width in the track-width direction of second region being larger than a width in the track-width direction of first region; an adhesion layer having an end exposed on the air-bearing surface and a first adhesion region, the first adhesion region being in close contact with an end face in the track-width direction of first region; and a cladding layer located around plasmon generator and adhesion layer. Adhesion force between adhesion layer and plasmon generator is greater than adhesion force between cladding layer and plasmon generator.

Thermally-assisted magnetic recording head

A thin film magnetic head includes a magnetoresistive effect (MR) laminated body that has the following structure: first and second magnetic layers in which the magnetization direction of at least one of the magnetic layers changes according to an external magnetic field; the first magnetic layer is provided at a lower side of a laminated direction; the second magnetic layer is provided at an upper side of the laminated direction; a non-magnetic intermediate layer made of ZnO sandwiched between the first and the second magnetic layers; a first intermediate interface layer is provided at the interface between the first magnetic layer and the non-magnetic intermediate layer; and a second intermediate interface layer is provided at the interface between the non-magnetic intermediate layer and the second magnetic layer. At least the first intermediate interface layer contains Ag and Zn, or Au and Zn.

Magnetoresistance effect element having layer containing Zn at the interface between magnetic layer and non-magnetic intermediate layer

A thermally assisted magnetic recording head includes a plasmon-generator that generates near-field light (NF light) from a near-field light generating portion on a near field light generator end surface constituting a portion of the medium opposing surface. The plasmon-generator has a first PG part having the near field light generator end surface constituting a portion of the medium opposing surface, and a second PG part positioned at a back side compared to the medium opposing surface when viewed from the medium opposing surface side. When viewed from the medium opposing surface side, the first PG part extends toward the back side from the medium opposing surface, and the second PG part is placed to contact at least a portion of both side surfaces of the first PG part. A material that configures the first PG part is a material having high thermostability compared to a material that configures the second PG part, and the material that configures the second PG part is a material having high excitation efficiency of plasmon compared to the material that configures the first PG part.

Thermally-assisted magnetic recording head, head gimbal assembly, and magnetic recording device

A polarization converter of the invention includes a core part that wave-guides an electromagnetic wave and a cladding part that is provided around the core part. The core part includes a conversion part converting a polarization state of the electromagnetic wave. A cross-sectional shape of the conversion part in a plane orthogonal to a propagation direction of the electromagnetic wave is a shape formed by cutting off a portion of a rectangular or square shape along a jagged diagonal line.

Polarization converter including a jagged diagonal line in plane orthogonal to propagation direction of electromagnetic wave

A method of manufacturing a magnetoresistive (MR) effective element having a pair of magnetic layers and a nonmagnetic intermediate layer including a ZnO film, wherein a relative angle of magnetization directions of the pair of magnetic layers varies according to an external magnetic field. The method includes a step for introducing a mix gas of oxygen gas and argon gas into a depressurized chamber, wherein a first target of ZnO, a second target of Zn and a substrate having a right-below layer are disposed in the chamber, and a step for depositing the ZnO film on the right-below layer by applying each of a first and second direct current (DC) application power to spaces between the first and second targets and the substrate respectively after the mix gas introducing step, wherein the first and second targets are set at negative potential, and the substrate is set at positive potential.

Method for manufacturing magnetoresistance effect element using simultaneous sputtering of Zn and ZnO

The thermally-assisted magnetic recording head includes: a magnetic pole having an end exposed on an air-bearing surface; a waveguide; a plasmon generator provided between the magnetic pole and the waveguide, and having a first region and a second region, the first region extending backward from the air-bearing surface to a first position, and the second region being coupled with the first region at the first position and extending backward from the first position; a gap layer provided between the magnetic pole and the first region of the plasmon generator and extending backward from the air-bearing surface to the first position, and being formed of a dielectric material; and a metallic layer buried in the gap layer, and extending forward from a second position that is located between the air-bearing surface and the first position.

Thermally-assisted magnetic recording head having gap layers between magnetic pole and plasmon generator

The thermally-assisted magnetic recording head includes: a magnetic pole having an end exposed on an air bearing surface; a waveguide; a plasmon generator provided between the magnetic pole and the waveguide, and having a first region and a second region, the first region extending backward from the air bearing surface to a first position, and the second region being coupled with the first region at the first position and extending backward from the first position; and a gap layer provided between the magnetic pole and the first region of the plasmon generator and extending backward from the air bearing surface, the gap layer including at least two dielectric layers and at least one metallic layer provided between the dielectric layers.

The thermally-assisted magnetic recording head includes: a laser light source having an emission surface, the emission surface allowing laser light to be emitted therefrom; a waveguide having a core and a cladding, the core allowing the laser light emitted from the laser light source to propagate therethrough, and the cladding surrounding the core; a magnetic pole; and a plasmon generator. Each of the core and the cladding has an end surface facing the emission surface, and the end surface of the cladding suppresses returning of the laser light to the laser light source.

Thermally-assisted magnetic recording head with optically isolating waveguide, head gimbal assembly, head arm assembly, magnetic disk unit, and light transmission unit

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Tokyo, Japan

Tsutomu Chou