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Disk device and recording head control method

A technology of a magnetic disk device and a control method, applied in directions such as magnetic recording head, magnetic recording, and arrangement/installation of recording head, can solve problems such as difficulty in detection and measurement of protruding amount, deterioration of element life, and difficulty in correction with high precision

Active Publication Date: 2020-02-28
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when a driving voltage is applied to the STO, the STO may generate heat to cause a slight protrusion of the element
As for the protrusion, it is difficult to detect and measure the protrusion amount due to its minuteness, and it is difficult to perform high-precision correction of the protrusion amount.
For this reason, when the protrusion of the element due to STO driving is more than expected, there is a problem that the life of the element is greatly deteriorated due to contact with the abnormal protrusion of the recording medium.

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

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no. 1 Embodiment approach

[0023] figure 1 is a block diagram schematically showing a hard disk drive (HDD) as the magnetic disk device of the first embodiment, figure 2 It is a side view showing a magnetic head and a magnetic disk in a floating state, image 3 A cross-sectional view schematically showing a head portion of a magnetic head and a part of a magnetic disk by enlarging, Figure 4 It is a cross-sectional view schematically showing an enlarged recording head end portion of a magnetic head and a part of a magnetic disk, Figure 5 is a block diagram showing a control system for correcting the heater output value according to the STO voltage.

[0024] like figure 1 As shown, the HDD 10 includes a rectangular housing 11, a magnetic disk 12 as a recording medium disposed in the housing 11, a spindle motor 14 that supports the magnetic disk 12 so as to be rotatable, and writes and reads data to and from the magnetic disk 12. A plurality of magnetic heads 16 out. In addition, the HDD 10 include...

no. 2 Embodiment approach

[0059] Figure 10 A flow chart for finding the heater correction amount more simply and with high accuracy is shown as the second embodiment. First, the STO voltage is set to cut-off state (step S31), according to the heater power value setting table 302, the setting of the heater power value during recording work and the condition conversion ratio of normal operation are set to be low (Pw -tmp) (step S32), set the heater ratio according to the heater ratio setting table 305 (step S33), and measure the track average amplitude (Track Average Amplifier: hereinafter referred to as TAA) TAA-0 of the reference data (step S34). Then, by setting the polarity of the STO voltage in a direction opposite to the direction in which the element oscillates, a state under the influence of heat generated by the pure STO voltage is simulated (step S35 ). Next, the STO voltage is controlled to be (Vb-n=i) (step S36), and the heater power during the recording operation is controlled to be (Pw-tm...

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Abstract

Embodiments of the present invention can suppress protrusion of an element caused by driving a spin torque oscillation element during recording to a magnetic disk. In the magnetic disk device according to the embodiment, when the supply of the voltage applied to the spin torque oscillation element is stopped, the reference data is recorded and reproduced on the recording layer of the magnetic disk, the reference characteristic value is measured, and the recording operation is performed based on the reference characteristic value. The temperature setting value of the heater is lowered, and the temperature setting value of the heater is changed, and the voltage applied to the spin torque oscillation element is supplied with a polarity opposite to that in normal operation, and then corrected. The correction characteristic value is measured by recording and reproducing the data, the difference is obtained by comparing the reference characteristic value and the correction characteristic value, and the decrease amount of the temperature setting value of the heater is corrected based on the difference.

Description

[0001] This application enjoys the priority of Japanese Patent Application No. 2017-164470 (filing date: August 29, 2017) as the basic application. This application incorporates 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 method of driving the recording head. Background technique [0003] In recent years, a perpendicular magnetic recording method has been adopted for magnetic disk devices 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 a vertical pattern corresponding to the recording data is generated in a predetermined area of ​​the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/127G11B5/31G11B5/55
CPCG11B5/1278G11B5/3146G11B5/5534G11B5/3906
Inventor 小泉岳
Owner KK TOSHIBA
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