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Stray field detector, magnetic disk drive, and method of head escaping

一种磁盘驱动器、杂散磁场的技术，应用在正交磁化磁头、磁记录头、在磁盘上信息的记录等方向，能够解决妨碍磁盘驱动器操作、信息丢失、伺服标记和磁道及扇区识别信号丢失等问题，达到高度可靠磁盘驱动器、防止退磁或消磁的效果

Inactive Publication Date: 2006-03-15
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If this phenomenon occurs, the written information will be lost and, except in extremely unusual cases, even servo marks and track and sector operation

Method used

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  • Stray field detector, magnetic disk drive, and method of head escaping
  • Stray field detector, magnetic disk drive, and method of head escaping
  • Stray field detector, magnetic disk drive, and method of head escaping

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Embodiment Construction

[0038] Embodiments of the present invention are illustrated using a perpendicular disk drive. refer to figure 1 and figure 2 A stray magnetic field detection method as a first embodiment of the present invention will be described. Such as figure 1 The illustrated disk drive includes: a magnetic recording medium 10 , which is rotated by a motor 12 ; a magnetic head 140 , which performs reading / writing to the magnetic recording medium 10 ; and a stray magnetic field detection unit 30 . The magnetic recording medium 10 is a two-layer perpendicular recording medium having a magnetic recording layer and a soft underlayer. The magnetic head 140 includes a single pole type magnetic head having a main pole and a return magnetic pole as a writing head, and an MR head using a magnetoresistance effect such as a giant magnetoresistance effect and a tunneling magnetoresistance effect as a read head. The magnetic head 140 is mounted on a slider in front of the suspension 151 and posi...

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Abstract

Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.

Description

technical field [0001] The present invention relates to a stray magnetic field detection method, a stray magnetic field detector, and a magnetic disk drive against stray magnetic fields in a data reading / writing device, wherein the data reading / writing device magnetically reads Signal written in the thickness direction. Background technique [0002] refer to Figure 14 and Figure 15 As an example, a perpendicular disk drive is used to illustrate conventional recording techniques. A perpendicular magnetic disk drive is a magnetic disk drive having a perpendicular magnetic recording medium, a read / write head, etc., and performs reading / writing by a perpendicular magnetic recording system. Unlike a conventional longitudinal recording system, a perpendicular magnetic recording system forms a magnetization recorded in the thickness direction of a recording medium. exist Figure 14 Among them, the perpendicular magnetic recording medium 10 includes a recording layer 101 having...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/02G11B21/00
CPCG11B5/1278G11B5/012G11B27/36G11B5/3903G11B5/02G11B2005/0029G11B2220/20G11B2005/0016
Inventor 前田英明滨口雄彦菊川敦铃木干夫沈丽萍荒井礼子
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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