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Two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and circuitry for selection of an active pair of associated amplifiers

A technology of disk drives and amplifiers, applied in magnetic recording, magnetic recording heads, and alignment tracks on magnetic disks, which can solve problems such as increased area data bit density

Active Publication Date: 2018-12-11
WESTERN DIGITAL TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in an increase in the area data bit density

Method used

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  • Two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and circuitry for selection of an active pair of associated amplifiers
  • Two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and circuitry for selection of an active pair of associated amplifiers
  • Two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and circuitry for selection of an active pair of associated amplifiers

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Embodiment Construction

[0017] The CPP magnetoresistive (MR) sensor structure of the present invention has application in magnetic recording disk drives, the operation of which will be briefly described with reference to FIGS. 1-5. FIG. 1 is a block diagram of a conventional magnetic recording hard disk drive that can be used for two-dimensional magnetic recording (TDMR) functions. The disk drive includes a magnetic recording disk 12 and a rotary voice coil motor (VCM) actuator 14 supported on a disk drive housing or chassis 16 . The disk 12 has a center of rotation 13 and is rotated in a direction 15 by a spindle motor (not shown) mounted to the base 16 . The actuator 14 is pivoted about an axis 17 and includes a rigid actuator arm 18 . The generally flexible suspension 20 includes a flexure element 23 and is attached to the end of the arm 18 . A head carrier or gas bearing slider 22 is attached to the flexure 23 . A magnetic recording read / write head 24 is formed on the trailing surface 25 of th...

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Abstract

The application discloses a two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and a circuitry for selection of an active pair of associated amplifiers. A two-dimensional magnetic recording (TDMR) disk drive has a gas-bearing slider that includes first and second sensors with a first cross-track spacing electrically coupled to a first magnetic shield, and third and fourth sensors with a different cross-track spacing electrically coupled to a second magnetic shield. The different spacings results in the first and third sensors and the second and fourth sensors having a cross-track spacing to accommodate for the effect of head skew. Each sensor is connected to an associated amplifier by a suspension trace and a common trace connected to its associated shield. Switching circuitry selects either the first and third amplifiers or the second and fourth amplifiers as the active pair depending on the radial location where the data is to be read. Thus the appropriate pair of sensors are aligned with the data tracks despite the presence of high head skew.

Description

technical field [0001] The present invention relates generally to a two-dimensional magnetic recording (TDMR) disk drive, and more particularly to a TDMR disk drive having a plurality of stacked sensors, wherein different sensors are selected to provide readback signals. Background technique [0002] One type of conventional magnetoresistive (MR) sensor used as a read head in magnetic recording disk drives is a "spin valve" sensor based on the giant magnetoresistance (GMR) effect. A GMR spin valve sensor has a layer stack comprising two ferromagnetic layers separated by a non-magnetic conductive spacer layer, typically copper (Cu) or silver (Ag). A ferromagnetic layer adjacent to the spacer layer has its fixed magnetization direction, such as pinned by exchange coupling with an adjacent antiferromagnetic layer, which is referred to as the reference or pinned layer. The other ferromagnetic layer adjacent to the spacer layer freely rotates its magnetization direction in the p...

Claims

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Application Information

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IPC IPC(8): G11B5/39G11B5/48G11B5/49G11B5/55G11B5/596G11B5/60
CPCG11B5/3974G11B5/3977G11B5/4886G11B5/4976G11B5/5552G11B5/5582G11B5/596G11B5/6011G11B5/3951G11B5/3912G11B5/3948G11B5/012G11B5/02G11B5/5539
Inventor J·T·孔特拉斯H·G·左拉
Owner WESTERN DIGITAL TECH INC
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