Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Magnetic recording head and magnetic disk storage apparatus mounting the magnetic head

a magnetic recording head and magnetic disk storage technology, applied in the direction of magnetic recording heads, data recording, instruments, etc., can solve the problems of degrading format efficiency, instability of reader characteristics, damage to read elements, etc., to improve format efficiency, reduce field intensity applied, and high recording density

Inactive Publication Date: 2005-06-30
WESTERN DIGITAL TECH INC
View PDF10 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a perpendicular recording head and a magnetic disk storage apparatus that can achieve a high recording density while reducing the field intensity applied at the read element. The head structure includes a main pole and an auxiliary pole with a double-layered perpendicular recording medium between them. The reader shields are shorter in length than the main pole and the auxiliary pole, which reduces the field intensity applied at the read element. The use of a soft underlayer in the recording medium also helps to increase the write-read element distance. The invention provides a perpendicular recording head that improves format efficiency without compromising the read element.

Problems solved by technology

This structure has a drawback: since the auxiliary pole and the thin film coil are located between the read element and the main pole, the write-read element distance is larger, which causes a degradation of the format efficiency.
This increase in field intensity might cause an instability in reader characteristics or damage to the read element, making it difficult to achieve a high recording density in a magnetic disk apparatus.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Next, exemplary embodiments of the present invention will be described referring to the accompanying drawings.

[0030]FIG. 1 is a conceptual diagram showing a magnetic disk apparatus according to an embodiment of the present invention. In this magnetic disk apparatus, a magnetic head mounted on a slider 13 fixed to the tip of a suspension arm 12 writes and reads magnetization signals at a given position on a magnetic disk 11 which is rotated by a motor 24. A rotary actuator 15 is driven to select a magnetic head position (track) in the magnetic disk radial direction. A write signal to the magnetic head and a read signal from the magnetic head are processed by signal processing circuits 35a and 35b.

[0031]FIG. 2 schematically shows a perpendicular recording head according to an embodiment of the present invention, where FIG. 2(a) is a cross-section view and FIG. 2(b) a plan view from the air bearing surface (ABS). This magnetic head is a write / read combination head which has a ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
geometric widthaaaaaaaaaa
length LBKaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

Embodiments of the invention provide a write head for perpendicular recording in which the magnetic field intensity applied at a read element is reduced with larger write-field gradients and the distance between a write element and a read element is small. In one embodiment, a pair of magnetic bodies for shielding a read element are provided on the leading and trailing sides of the read element respectively and whichever one of the two shields is the longer in the length from the air bearing surface is shorter than the length up to the back contact position PBK at which a main pole and an auxiliary pole are connected.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application claims priority from Japanese Patent Application No. JP 2003-427681, filed Dec. 24, 2003, the entire disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to a perpendicular recording magnetic head and a magnetic disk storage apparatus which incorporates the same. [0003] In a magnetic disk apparatus, data on a recording medium is read or written by a magnetic head. In order to increase the capacity of the magnetic disk storage, the areal density has to be increased. However, in the conventional longitudinal recording method, the thermal fluctuation in medium magnetization prevents one from achieving the higher areal density. A solution to this problem is to employ a perpendicular recording method whereby the recorded magnetizations are aligned in the direction perpendicular to the medium. [0004] The perpendicular recording method is available in two ty...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G11B5/127G11B5/33G11B5/31G11B5/39
CPCG11B5/33G11B5/127
Inventor MOCHIZUKI, MASAFUMISUZUKI, KAORIETOH, KIMITOSHI
Owner WESTERN DIGITAL TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com