Hitachi, Ltd.

Western Digital Technologies, Inc.

Hgst Netherlands, B.v.

Nippon Oil Corporation

Nippon Oil Company

Anest Iwata Corporation

Lapis Semiconductor Co., Ltd.

Hitachi Consumer Electronics Co., Ltd.

Nippon Mitsubishi Oil Corporation

Takuya Matsumoto

Barry C Stipe

Hitoshi Mazaki

Shen Ren

Kenji Katsumata

Irizo Naniwa

Satoru Takashimizu

Yuji Yamamoto

Yuji Hatanaka

Shuko Sei

Takumi Okamura

Erhard Theodor Schreck

Takashi Seki

Junichiro Shimizu

Hideki Saga

Muhammad Asif Bashir

Sergei L Sochava

Satoshi Arai

Toru Nakamura

Kimio Nakamura

Vijay Prakash Singh Rawat

Iwane Shiozaki

Shigeki Takikawa

Marco Negri

Harukazu Miyamoto

Satoshi Miyazaki

John Thomas Contreras

Tomoyuki Maeda

Aron Pentek

Hirofumi Sukeda

Petrus Antonius Van Der Heijden

Lidu Huang

Masashi Kiguchi

Hamid Balamane

Shinji Sasaki

Fumio Isshiki

Yukio Kato

Tetsuya Uesaka

Shozo Kosaka

Fumiko Akagi

Seheon Kim

Tadahiro Kaminade

Norman N Shi

Kentaro Namikawa

Venkata R K Gorantla

Kazuki Arino

Akio Mutou

Motoyasu Terao

Masaaki Kobayashi

Shigeo Nakamura

Takeshi Shimano

Masafumi Mochizuki

Fu-Ying Huang

Sumio Hosaka

Yoshio Takahashi

Sukumar Rajauria

Naoki Matsushima

Roger William Wood

Takehiro Toyooka

Marc A Finot

Kenji Suzuki

Tomoaki Uno

Thomas Dudley Boone, Jr

Akira Takagi

Kyoko Kojima

Takayuki Ichihara

Yuko Tsuchiya

Ikuya Tagawa

Matteo Staffaroni

Yosuke Numao

Robert Lee Smith

Shigeyuki Sasaki

Eiji Yoda

Takayuki Hirayama

Yasuhiko Iwanabe

Yoshihiro Kumagai

Atsushi Morohoshi

Isamu Orita

Thomas William Clinton

Mousumi Mani Biswas

Petrus Antonius Vanderheijden

Atsuko Kuroda

Barry Cushing Stripe

Wan Kuang

Ozgun Suzer

Tomoo Hirai

Yasuhiro Ochii

Kei Ishikawa

Tomohiro Hashizume

Masato Sone

Bin Ouyang

Jun-ichiro Shimizu

Utis Cumhnoo

Embodiments of the present disclosure generally relate to a vertical cavity surface emitting laser (VCSEL), a head gimbal assembly for mounting a VCSEL, devices incorporating such articles, and to a process for forming a VCSEL. In an embodiment, a VCSEL device provided. The VCSEL device includes a chip for mounting on a slider, the chip having a plurality of surfaces and a notch, the plurality of surfaces comprising: a bottom surface for facing the slider; a top surface opposite the bottom surface; and a plurality of side surfaces, wherein the notch forms a recessed edge spaced away from the bottom surface and toward the top surface, the notch having a shoulder, a side, and an angle (&#x3b8;1) between the shoulder and the side. The VCSEL device further includes two laser diode electrodes positioned in any combination on one or more of the plurality of surfaces of the chip.

Vertical cavity surface emitting laser, head gimbal assembly, and fabrication process

The present disclosure generally relates to a magnetic recording head for a magnetic media drive. The magnetic recording head comprises a near field transducer (NFT), a vertical cavity surface emitting laser (VCSEL) device, and a waveguide structure coupled between the NFT and the VCSEL device. The waveguide structure comprises a plurality of waveguide channels and a multimodal interference (MMI) combiner coupled to the waveguide channels. One or more of a curvature, a path length, and a propagation length of each of the waveguide channels is optimized such that each waveguide channel is controllable, or otherwise phase coherent with adjacent waveguide channels. The VCSEL device is capable of emitting a plurality of lasers through the plurality of waveguide channels, and the plurality of lasers are phase coherent when input into the MMI combiner. The MMI combiner combines a power of the plurality of lasers, which is output to the NFT.

Beam combiner for VCSEL array in HAMR head

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.

Heat-assisted magnetic recording (HAMR) head with tapered main pole and heat sink material adjacent the pole

The present disclosure relates to pretreating a magnetic recording head for magnetic media drive. For a heat assisted magnetic recording (HAMR) head, a light source provides the necessary heat for the drive to operation. A vertical cavity surface emitting laser (VCSEL) is mounted to a top surface of a slider. A plurality of laser beams are emitted from the bottom surface of the VCSEL and directed to a corresponding number of waveguide structures within the HAMR head. The waveguide structures feed into a multimode interference (MMI) device that then directs the laser into a single waveguide for focusing on a near field transducer (NFT). The VCSEL lasers are phase coherent and have no mode hopping.

VCSEL array for HAMR

A heat-assisted magnetic recording (HAMR) head has a slider with a gas-bearing-surface (GBS). The slider supports a near-field transducer (NFT) and a main magnetic pole that has a step or recess in the NFT-facing surface near the GBS that contains plasmonic material. A thermal shunt is located between the NFT and the main pole to allow heat to be transferred away from the optical spot generated by the NFT. The NFT-facing surface of the main pole that is recessed from the step away from the GBS is in contact with the thermal shunt, and the thermal shunt is in contact with the plasmonic material in the step in the back region recessed from the GBS, so there is no increase in the spacing between the NFT and a large portion of the main pole.

Heat-assisted magnetic recording (HAMR) head with main pole having recess for plasmonic material

A heat-assisted magnetic recording (HAMR) disk drive uses a semiconductor laser mounted on a slider to deliver light to a near-field transducer (NFT) via a waveguide located inside the slider. The waveguide includes a core and cladding material that is transparent to the laser light and surrounds the core. Layers of stray light absorption material are located inside the slider on opposite edges of the waveguide core in the same plane as the core and on opposite sides of the waveguide core in planes spaced from the plane of the core. Portions of the waveguide cladding material are located between the waveguide core and the stray light absorption layers. The stray light absorption layers absorb light that leaks into the cladding material and substantially reduces stray light reflected to the laser to prevent undesirable laser power fluctuation.

Heat-assisted magnetic recording (HAMR) slider with stray light removal

A heat-assisted magnetic recording (HAMR) head has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole. First heat-sink material is located on the cross-track sides of the main pole and second heat-sink material is located on the cross-track sides of the waveguide. The second heat-sink material may be in contact with the first heat-sink material, and a thermal shunt of high thermal conductivity may interconnect the NFT with the first and second heat-sink material. Heat from the NFT output tip flows to the second heat sink material through the NFT and the thermal shunt. Optically reflective material may be located between the waveguide and the second heat-sink material to improve the optical efficiency of the NFT.

Heat-assisted magnetic recording (HAMR) head with heat sink material adjacent the waveguide

A heat-assisted magnetic recording (HAMR) head has a gas-bearing slider that supports a a main magnetic pole, a near-field transducer (NFT) and a waveguide optically coupled to the NFT. Optically reflective side shields are located adjacent the cross-track sides of the waveguide at the slider's gas-bearing surface (GBS). The side shields may also be located adjacent the cross-track sides of the NFT and extend in the along-the-track direction to the write head's magnetic return pole. The cross-track gap width between a portion of the side shields adjacent the NFT at the GBS may be different from the cross-track gap width between a portion of the side shields adjacent the waveguide end at the GBS.

Heat-assisted magnetic recording (HAMR) head with optically reflective shield material adjacent the waveguide

A semiconductor device includes a circuit-to-be-adjusted in which an output characteristic thereof can be adjusted by a fuse that is controlled based on a fuse signal. The semiconductor device includes a control circuit using, as a power source, an internal power source that has a converted voltage obtained by converting a voltage of an external power source, the control circuit being configured to generate control signals A, B based on an inputted test signal, the control signals being able to adjust the circuit-to-be-adjusted in place of the fuse signal. The semiconductor device includes a selector circuit that selects the fuse signal before the internal power source reaches a stable state after the external power source is turned on, and selects the control signal CS after the internal power source has reached a stable state.

Semiconductor device

A slider for heat assisted magnetic recording (HAMR) is provided. The slider includes a writer for writing data to a HAMR medium, a reader for reading data stored on the HAMR medium, a near field transducer (NFT), a first waveguide optically coupled to the NFT, a slider laser configured to generate and transmit a first light energy to the first waveguide such that the NFT causes a portion of the HAMR medium to heat up, to assist the writer for writing data to the HAMR medium, and a second waveguide optically coupled to the NFT, for transmitting a light energy from an external laser to the NFT to optically anneal the NFT during a fabrication process of the slider.

Methods and apparatuses for localized annealing of sliders configured for heat assisted magnetic recording

Embodiments disclosed herein generally relate to a HAMR head. The HAMR head includes a main pole, a waveguide and a NFT disposed between the main pole and the waveguide. The NFT includes an antenna, and the antenna includes a first portion and a second portion. The second portion may be made of a material having a higher melting point than the material of the first portion. Having the second portion helps reduce the temperature rise of the NFT and reduce the laser power applied to the NFT.

Near-field transducer for heat assisted magnetic recording comprising of thermally stable material layer

Growing community of inventors

Yokohama, Japan

Takuya Matsumoto