Thin-Film Magnetic Head Pole Structure for Remnant Magnetization Control
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Solution Overview
Problem
Conventional thin-film magnetic heads for perpendicular recording suffer from pole erasure, where data recorded on a hard disk is erased due to leakage magnetic flux, even when no write current is flowing, leading to reduced recording density and signal weakening.
Innovation Solution
A thin-film magnetic head structure is designed with a main magnetic pole layer featuring a base magnetic pole part and an embedded magnetic pole part buried in a depression, joined by a yoke magnetic pole part with an intervening insulative film, which blocks remnant magnetization and enhances magnetism, preventing pole erasure and improving overwrite characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional thin-film magnetic head structure is used, then manufacturing is simpler, but pole erasure occurs due to remnant magnetization causing leakage magnetic flux
Solution Approach 1:
The main magnetic pole layer is divided into a base magnetic pole part and an embedded magnetic pole part. The embedded magnetic pole part is separated from the yoke magnetic pole part by an insulative film, creating distinct functional segments that prevent remnant magnetization from causing pole erasure while maintaining magnetic functionality.
Solution Approach 2:
An insulative film is introduced as an intermediary layer between the embedded magnetic pole part and the yoke magnetic pole part. This insulative film blocks the path of remnant magnetization, preventing leakage magnetic flux that would cause pole erasure, while still allowing the structure to function as intended.
2Quantity of substance
If recording density is increased, then data storage capacity improves, but pole erasure becomes more severe due to higher density recording
Solution Approach 1:
By segmenting the magnetic pole structure into base and embedded parts with an insulative barrier, the invention enables higher recording density operations without the pole erasure problem that would otherwise worsen at high densities, thus maintaining data retention reliability.
Solution Approach 2:
The invention converts the potentially harmful remnant magnetization effect into a beneficial configuration where the insulative film harnesses the magnetic field generation while blocking the harmful leakage path, enabling high-density recording without data loss.
3Reliability
If an insulative film is added to block remnant magnetization, then pole erasure is prevented, but manufacturing complexity increases
Solution Approach 1:
The segmented structure with insulative film, while adding manufacturing steps, creates distinct functional zones that simplify the control of remnant magnetization effects, making the overall manufacturing process more manageable despite increased complexity.
Solution Approach 2:
The insulative film is formed in advance during the manufacturing process, before final assembly, to pre-establish the magnetic field blocking pathway. This preliminary action prevents pole erasure from occurring in the first place, simplifying quality control and testing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure effectively prevents pole erasure and enhances recording density by reducing remnant magnetization and improving the overwrite characteristic, allowing for higher data storage capacity without signal degradation.
Implementation Method 1
an insulative film disposed between the embedded magnetic pole part and yoke magnetic pole part at a position distanced farther from the medium-opposing surface than the recording gap layer
Implementation Method 2
the intervening insulative film blocks remnant magnetization and enhances magnetism, preventing pole erasure
Implementation Method 3
joined by a yoke magnetic pole part with an intervening insulative film, which blocks remnant magnetization and enhances magnetism
Data Source
AI summary
A thin-film magnetic head structure has a configuration adapted to manufacture a thin-film magnetic head configured such that a main magnetic pole layer including a magnetic pole end part on a side of a medium-opposing surface opposing a recording medium, a write shield layer opposing the magnetic pole end part so as to form a recording gap layer on the medium-opposing surface side, and a thin-film coil wound about the write shield layer or main magnetic pole layer are laminated. The main magnetic pole layer includes a base magnetic pole part comprising the magnetic pole end part and a base depression distanced farther from the medium-opposing surface than the magnetic pole end part, and an embedded magnetic pole part buried in the base depression and joined to the base magnetic pole part. The thin-film magnetic head structure includes a yoke magnetic pole part joined to the base magnetic pole part and embedded magnetic pole part at a position distanced farther from the medium-opposing surface than the recording gap layer, and an intervening insulative film disposed between the embedded magnetic pole part and yoke magnetic pole part at a position distanced farther from the medium-opposing surface than the recording gap layer.