Magnetic Head Pole Layer Magnetization Control for Perpendicular Recording
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Solution Overview
Problem
Magnetic heads for perpendicular magnetic recording face challenges in suppressing pole erase phenomena without complicating the pole layer structure, leading to increased manufacturing costs and reduced throughput due to the complexity of existing techniques.
Innovation Solution
A magnetic head design featuring a pole layer with a track width defining portion and a wide portion, where the maximum width of the wide portion is greater than the track width, and the end face of the track width defining portion has regions with opposite magnetization directions, reducing the occurrence of pole erase without increasing structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pole layer structure is simplified to reduce manufacturing complexity, then manufacturing cost and throughput improve, but the ability to suppress pole erase deteriorates
Solution Approach 1:
The invention changes the magnetization state parameter of the pole layer from a uniform state to a controlled non-uniform state with opposite magnetization directions in different regions. This parameter change enables pole erase suppression through magnetic field cancellation while maintaining a simple single-layer pole structure, thus resolving the contradiction between manufacturing simplicity and pole erase suppression capability
Solution Approach 2:
The invention creates a composite magnetization structure within the pole layer by inducing opposite magnetization directions in different regions (first region and second region). This composite magnetization state acts as a distributed magnetic shield that suppresses pole erase without requiring additional physical material layers, thereby maintaining manufacturing simplicity while achieving reliable pole erase suppression
2Productivity
If the pole layer structure is simplified to improve manufacturing throughput, then productivity increases, but pole erase suppression capability decreases
Solution Approach 1:
The invention changes the magnetization state parameter of the pole layer from a uniform state to a controlled non-uniform state with opposite magnetization directions in different regions. This parameter change enables pole erase suppression through magnetic field cancellation while maintaining a simple single-layer pole structure, thus resolving the contradiction between manufacturing simplicity and pole erase suppression capability
Solution Approach 2:
The pole layer serves dual functions: it generates the write magnetic field for data recording and simultaneously suppresses pole erase through its controlled non-uniform magnetization state. This self-service capability eliminates the need for separate suppression structures, maintaining high manufacturing throughput while achieving reliable pole erase suppression
3Reliability
If a complex pole layer structure with multiple layers is used to suppress pole erase, then pole erase suppression improves, but device complexity increases
Solution Approach 1:
The invention changes the magnetization state parameter of the pole layer from a uniform state to a controlled non-uniform state with opposite magnetization directions in different regions. This parameter change enables pole erase suppression through magnetic field cancellation while maintaining a simple single-layer pole structure, thus resolving the contradiction between manufacturing simplicity and pole erase suppression capability
Solution Approach 2:
The invention extracts the pole erase suppression function from separate physical structures (additional layers or components) and integrates it into the magnetization state control of the existing pole layer. By taking out the suppression mechanism from structural complexity and embedding it in magnetic state control, the invention achieves reliable pole erase suppression with minimal device complexity
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 design effectively suppresses pole erase occurrences while maintaining efficient write characteristics, reducing manufacturing costs, and improving the yield of magnetic heads by controlling the state of magnetization in the pole layer.
Implementation Method 1
a pole layer allowing a magnetic flux corresponding to the field generated by the coil to pass therethrough, and generating a write magnetic field
Implementation Method 2
a coil for generating a magnetic field corresponding to data to be written on the recording medium
Data Source
AI summary
A pole layer incorporates a track width defining portion and a wide portion. The track width defining portion has an end face that is located in the medium facing surface and that defines the track width. The maximum width of the wide portion is greater than the track width and equal to or greater than the length of the wide portion taken in the direction orthogonal to the medium facing surface. When the coil is generating no magnetic field, in the end face of the track width defining portion, there exist first and second regions in which the directions of components of magnetization orthogonal to the medium facing surface are opposite.