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Disk device and recording head control method

A technology of a magnetic disk device and a recording head, applied in the directions of magnetic recording head, magnetic recording, recording/reproducing/deleting method, etc., can solve problems such as inability to realize current density

Active Publication Date: 2021-08-03
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since the incidental resistance component fluctuates in accordance with the temperature change, the voltage applied to the element part also fluctuates, making it impossible to achieve constant current density.

Method used

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  • Disk device and recording head control method
  • Disk device and recording head control method
  • Disk device and recording head control method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0024] refer to figure 1 and figure 2 , the configuration of a magnetic disk device (hard disk drive: hereinafter referred to as HDD) to which the embodiment is applied will be described. figure 1 is a block diagram schematically showing HDD, figure 2 It is a cross-sectional view schematically showing a head portion of a magnetic head and a part of a magnetic disk by enlarging, image 3 is a side view showing a magnetic head, a suspension, and a recording medium in an HDD, Figure 4 is shown from image 3 A diagram of the schematic configuration in the case of viewing the head slider of the magnetic head from the A direction, Figure 5 is a block diagram showing a system for controlling the STO bias voltage.

[0025] Such as figure 1 As shown, the HDD 10 includes: a rectangular casing 11; a magnetic disk 12 as a recording medium disposed in the casing 11; a spindle motor 14 that supports and rotates the magnetic disk 12; and writes data to the magnetic disk 12, read h...

no. 2 Embodiment approach

[0085] As in the first embodiment, it is important to control the bias voltage applied to the STO element 65 based on the resistance value R=Vm / Im at the time of voltage application for measurement. Therefore, it is necessary to appropriately perform bias control according to the temperature in the magnetic disk drive. In this embodiment, a method of controlling the STO bias voltage according to the temperature inside the disk drive will be described.

[0086] Figure 9 It is a flowchart showing STO bias voltage control processing when the magnetic disk device according to the second embodiment is operated.

[0087] First, when the start of operation is instructed by a host computer command (step S21), the temperature in the device is measured (step S22). It is judged whether there is a temperature change (step S23). If there is a temperature change, the bias voltage is raised when the temperature rises, and the bias voltage is lowered when the temperature falls (step S24)....

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Abstract

The embodiment provides a magnetic disk device and a recording head control capable of increasing the recording density by stabilizing the voltage applied to the element regardless of the dimensional variation of the high-frequency auxiliary element and the temperature characteristics of the accompanying resistance component of the wiring path. method. The recording head is provided with: a main magnetic pole, which generates a recording magnetic field; a return magnetic pole, which is opposite to the front end of the main magnetic pole through a writing gap; a recording coil, which excites the magnetic flux to the magnetic circuit formed by the main magnetic pole and the return magnetic pole; a write gap; and a bias voltage supply circuit for applying a bias voltage to the high-frequency auxiliary element through the main magnetic pole and the return magnetic pole, and the recording head applies a measurement voltage to the high-frequency auxiliary element in response to an adjustment instruction of the bias voltage to measure energization As for the current, the resistance value in the voltage supply path is calculated from the relationship between the measurement current and the measurement voltage, and the bias voltage applied during data recording is changed based on the calculated resistance value.

Description

[0001] This application enjoys the priority of the basic application based on Japanese Patent Application No. 2018-246700 (filing date: December 28, 2018). This application includes the entire content of the basic application by referring to this basic application. technical field [0002] Embodiments of the present invention relate to a magnetic disk device using a perpendicular magnetic recording head, and a recording head control method used in the magnetic disk device. Background technique [0003] In recent years, in magnetic disk devices, a perpendicular magnetic recording method has been adopted in order to achieve higher recording density, larger capacity, or smaller size. In the magnetic disk device based on this method, the recording head for perpendicular magnetic recording is made to face the recording surface of a magnetic disk having a recording layer for perpendicular magnetic recording, and the recording head generates a vertical region corresponding to the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/02G11B5/31G11B5/48G11B5/55G11B5/60G11B5/82
CPCG11B5/02G11B5/3116G11B5/4806G11B5/5565G11B5/60G11B5/82G11B5/09G11B5/17G11B5/35G11B2005/0021G11B2005/0024G11B2005/0026G11B2005/0029
Inventor 小泉岳大竹雅哉
Owner KK TOSHIBA