Perpendicular Magnetic Writer Side Shield Seed Layer
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Solution Overview
Problem
Conventional disk drives face challenges in achieving tightly controlled magnetic writing fields to increase areal density, as existing technologies struggle to optimize the magnetic field profile for efficient data storage, leading to limitations in data density and interference between tracks.
Innovation Solution
The implementation of a perpendicular magnetic recording transducer with a trapezoidal main pole tip and strategically positioned side shields, using magnetic materials with varying magnetic moments and deposition methods, enhances the write field profile by optimizing side field gradients and reducing adjacent track interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional magnetic recording transducers are used, then manufacturing is simpler, but areal density cannot be increased due to inability to achieve tightly controlled magnetic writing fields
Solution Approach 1:
The transducer is divided into multiple functional components: main pole, side shields, seed layers with different magnetic moments. This segmentation allows each component to be optimized independently for its specific function, enabling precise control of the magnetic writing field while managing complexity through modular design
Solution Approach 2:
Different regions of the transducer are assigned different magnetic moment properties. The seed layer has high magnetic moment for strong field generation, while the side shield has lower magnetic moment for field confinement. This local differentiation of magnetic properties enables precise spatial control of the writing field
2Manufacturing precision
If side gaps are narrowed to increase data density, then areal density improves, but adjacent track interference increases
Solution Approach 1:
The magnetic moment of the side shield is specifically optimized to be lower than that of the main pole. This parameter change creates a magnetic field gradient that confines the writing field to the intended track, allowing narrow side gaps without increasing adjacent track interference
Solution Approach 2:
The side shield structure converts potential harmful lateral field spread into beneficial field confinement. By strategically positioning and dimensioning the side shield with appropriate magnetic moment, the structure that could potentially cause interference is instead used to sharpen the field gradient and protect adjacent tracks
3Object-generated harmful factors
If side shields are added to reduce adjacent track interference, then track isolation improves, but device complexity increases
Solution Approach 1:
The side shield and seed layer are merged into an integrated structure where the side shield is deposited over the seed layer. This combination achieves both field confinement and structural support in a single integrated component, reducing overall device complexity while maintaining track isolation
Solution Approach 2:
The side shield structure serves multiple functions simultaneously: it confines the magnetic field to reduce adjacent track interference, provides structural support for the pole tip, and helps define the writing field geometry. This multi-functionality reduces the need for separate components
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
This configuration allows for narrower side gaps and maintains sufficient write field strength, reducing adjacent track interference while preserving on-track performance, enabling higher data density storage without compromising write field integrity.
Implementation Method 1
Magnetic fields emanating from the write transducer pole tip switches magnetization of the magnetic medium
Implementation Method 2
An air bearing forms between the head and the disk due to the disk rotating at high speeds to provide controlled head to disk spacing
Data Source
AI summary
A perpendicular magnetic recording writer for use in a data storage device, the recording transducer has a magnetic writer pole, a pole tip facing an air bearing surface (ABS). The pole tip has a pole face, leading side wall, a trailing side wall, a first side wall and a second side wall. A trailing side wall nonmagnetic gap layer on the trailing side wall, a first side wall nonmagnetic gap layer deposited on the first side wall, and a second side wall nonmagnetic gap layer deposited on the second side wall. A high magnetic moment seed layer is deposited on the trailing side wall nonmagnetic gap layer, the first side wall nonmagnetic gap layer, and the second side wall nonmagnetic gap layer. In other aspects of the invention shields are provided that have magnetic moments less than the magnetic moment of the seed layers.