Western Digital Technologies, Inc.

Hitachi Global Storage Technologies Netherlands B.v.

Hgst Netherlands, B.v.

International Business Machines Corporation

Hitachi Global Storage Technologies

Qing Dai

Bruno Jean Marchon

Sukumar Rajauria

Xiaoping Bian

Erhard Theodor Schreck

Kentaro Takano

Hoa Van Do

Yuichi Aoki

Yoshihiro Ikeda

Wing Tsang Tang

Paul Haruo Kasai

Kosuke Nagase

Barry C Stipe

Katsumi Mabuchi

Dan Saylor Kercher

Mary Frances Minardi

Mina Amo

Mehdi Habibollahzadeh

Tan Duy Trinh

Yukio Kato

Kiyoshi Hashimoto

Oscar Jaime Ruiz

Bing K Yen

Dennis R McKean

Li Fei Zheng

Xing-Cai Guo

Huey-Ming Tzeng

Jennifer Lu

Oleksandr Mosendz

Na Wang

Eun K Row

Franck Rose

Jack Jyh-Kau Chang

Ruihua Li

Min Xiao

Chu S Tran

Dongying Li

Alan C Lam

Quang Le

John Thomas Contreras

Hisashi Takano

Cyril Guyot

Dieter Klaus Weller

Ferdinand Hendriks

Bernhard E Knigge

Mike Suk

Lidu Huang

Kai Tang

Kenji Kuroki

Bernd Lamberts

David Thomas Margulies

Weidong Huang

Shaomin Xiong

Mohammad Taghi Mirzamaani

Hiroshi Yoshida

Tsai-Wei Wu

Hans Juergen Richter

Ullal Vasant Nayak

Natacha Frederique Supper

Yong Hu

Richard Longstreth White

Nobuyuki Okunaga

Xiaokun L Chew

Krisda Siangchaew

Jung-Seo Park

Qi-Fan Xiao

Sripathi Vangipuram Canchi

Simone Pisana

Run-Han Wang

Maki Maeda

Bruno Jacques Marchon

Nattaporn Khamnualthong

James William Reiner

Hassan Osman

David Braunstein

Sudha Narayan

Kenji Tasaka

Bernd Heinz

Yixiang Zhang

Yuichiro Sano

Ehsan Rismaniyazdi

Michael Andrew Scarpulla

Huaming Xu

A data storage device may include an enclosure and a metal organic framework (MOF) container situated within an enclosure interior. The MOF container contains a MOF configured to store captive molecular units and to release the captive molecular units in gaseous form into the enclosure interior. A method of manufacturing the data storage device may include charging the MOF, attaching the MOF container to the enclosure interior, and sealing the enclosure after attaching the MOF container to the interior of the enclosure. A method of adjusting an amount of gas in a sealed data storage device may comprise including a MOF container within an interior of the sealed data storage device, the MOF container containing a MOF, charging the MOF, and, after the sealed data storage device has been placed into service, the MOF releasing captive molecular units into the interior of the sealed data storage device.

Devices and methods for metal organic framework (MOF) based oxygen replenishment in data storage devices

A method of adjusting a humidity within an interior of an enclosure of a data storage device comprises detecting a trigger condition, and, in response to detecting the trigger condition, mixing together two or more chemicals or combinations of chemicals situated within the interior of the enclosure of the data storage device to create a water-releasing substance, and the water-releasing substance releasing water, thereby increasing the humidity within the interior of the enclosure of the data storage device. A data storage device comprises a mixing device configured to mix two or more chemicals or combinations of chemicals to provoke a chemical reaction that releases water; and a controller configured to cause the mixing device to mix the two or more chemicals or combinations of chemicals.

Active humidity control using chemical mixtures in data storage devices

A data storage device may include a container comprising a gas-permeable membrane and a temperature-sensitive gas-releasing substance inside of the container. The temperature-sensitive gas-releasing substance is characterized by a gas-release profile wherein, below a critical temperature, the temperature-sensitive gas-releasing substance releases essentially none of a particular gas, and above the critical temperature, and within a range of expected operating temperatures of the data storage device, the temperature-sensitive gas-releasing substance releases the particular gas in quantities that generally increase with increasing temperature.

Passive and active gas compensation techniques for data storage devices

The present disclosure generally relates to a magnetic recording drive comprising a write head disposed over a media. The write head comprises a main pole, a waveguide disposed adjacent to the main pole, a near field transducer (NFT) coupled between the main pole and the waveguide at a media facing surface (MFS) and a head overcoat disposed on the MFS, the head overcoat comprising SiN. The head overcoat has an extinction coefficient (k) value of about 0.0. The media comprises a media overcoat disposed adjacent to the head overcoat. The media overcoat comprises a first layer of C and a second layer of SiN disposed on the first layer. The media overcoat has a k-value of about 0.5 or greater. The head overcoat is transparent while the media overcoat is heat absorbent.

Head and media overcoats for heat assisted magnetic recording

Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices are configured to receive signals indicative of conditions of a write operation by the selected head. The one or more processing devices are further configured to determine, based on the signals, a verification status indicating whether the write operation was successful. The one or more processing devices are further configured to output the verification status within a selected time limit.

Data storage device with write protection and guaranteed rapid write verification in energy-assisted recording (EAR)

A HAMR data storage device may include a magnetic media and a slider comprising: a main pole, a waveguide, and a near-field transducer (NFT) situated between the main pole and the waveguide, wherein an air-bearing surface (ABS) of the slider comprises a transparent overcoat layer situated over the main pole, the waveguide, and the NFT, and wherein the transparent overcoat layer has a particular thickness such that, during an operational phase of the HAMR data storage device, a gap between a media-facing surface of the transparent overcoat layer and the magnetic media is less than about 0.5 nm.

Local extension of head overcoat with a near-field transducer extending toward the media-facing surface

The present disclosure relates to pretreating a magnetic recording head to increase the lifetime of the magnetic media drive. A transparent smear is purposefully formed on the magnetic recording head to ensure the magnetic recording head does not overheat and lead to a short drive lifetime. The transparent smear is formed from material found in the magnetic media. The transparent smear is formed by pretreating the magnetic recording head with the transparent material from the magnetic media. The pretreating occurs without writing any data to the magnetic media. Once the transparent smear is in place, writing may occur. The magnetic recording head can be retreated at a later time should the transparent smear degrade. Furthermore, if an optically absorbing smear develop, it can be removed and a new transparent smear may be formed.

In-situ NFT pre-treatment to accumulate optically transparent material on NFT to improve reliability

The present disclosure relates to a magnetic recording medium for a magnetic media drive. Absorbing smears can develop on magnetic recording heads during operation. The absorbing smears lead to shortened drive lifetime. Transparent smears, on the other hand, do not have as deleterious of an impact on drive lifetime as compared to absorbing smears. By doping the medium with a dopant that can lead to development of transparent smears, the formation of absorbing smears can be reduced or even eliminated, which leads to a longer drive lifetime. The dopant can be disposed in the capping layer of the medium or in the absorbing overcoat layer. The dopant will migrate through the medium to the top surface of the medium during operation. From the top surface of the medium, the dopant will deposit on the magnetic head and form a transparent smear.

HAMR media to assist optically transparent build-up on NFT to improve reliability

A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.

Heat-assisted magnetic recording device capable of providing negative electrical potential at NFT

A hard disk drive has a gas-bearing slider supporting a write head with an electrically conductive structure, like a spin-torque oscillator (STO), in the write gap, and dual independent interface voltage control (IVC) circuitry coupled to elements on the slider. A first IVC circuitry provides a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a bias voltage to the electrically conductive structure region to assure a negative potential of the electrically conductive structure region relative to the disk to minimize degradation of the slider overcoat and thus oxidation of the electrically conductive structure.

Hard disk drive with write gap conductive structure and dual independent interface voltage control circuitry

Disclosed herein is a magnetic storage device that comprises a housing defining an interior cavity. The magnetic storage device also comprises at least one magnetic disk in the interior cavity of the housing. The magnetic storage device further comprises at least one read-write head in the interior cavity and configured to read data from and write data to the magnetic disk. The read-write head comprises a heat-assisted magnetic storage (HAMR) head. The magnetic storage device additionally comprises a gas, comprising oxygen and helium, sealed in the interior cavity of the housing. A percent concentration of oxygen in the gas is greater than or equal to 3%. A pressure of the gas is between 10% and 70%, inclusive, of atmospheric pressure. A relative humidity within the interior cavity is less than 5%, inclusive. A percent concentration of helium in the gas is less than or equal to 90%.

Magnetic storage device with heat-assisted magnetic storage head and associated method of manufacture

A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. A write power is applied to the laser in order to write data to the disk during a write operation. A determination is made as to whether the laser power should be in an off state after the write operation. After the write operation, the laser power is gradually decreased to the off state based on a first decrease function.

Data storage device gradually decreasing laser power after write operation

An apparatus, according to one embodiment, comprises a near field transducer; an adhesion layer on a media facing side of the near field transducer, the adhesion layer comprising Ni and Cr; and a protective layer on a media facing side of the adhesion layer. Other apparatuses, systems and methods are described in additional embodiments.

Near field transducer having an adhesion layer coupled thereto

A system, according to one embodiment, includes a near field transducer; an adhesion layer on a media facing side of the near field transducer, the adhesion layer comprising Ni and Cr; and a protective layer on a media facing side of the adhesion layer. Other systems and methods are described in additional embodiments.

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San Jose, CA, United States of America

Qing Dai