Write Pole Taper Angle Control via Non-Magnetic Layer Deposition

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Solution Overview

Problem

The fabrication of data storage devices with high data bit density faces challenges in forming write poles with precise taper angles due to limited form factors and the accumulation of deposited material, which affects the precision of magnetic field control and data writing.

Innovation Solution

A trench with a first taper angle is created, and a non-magnetic layer is deposited to form a second trench sidewall with a continuous second taper angle that extends past the first plane, allowing the write pole to be formed closer to the first trench sidewall at a predetermined depth, enabling enhanced control over the taper angle and magnetic field operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a write pole is formed with a precise taper angle in a limited form factor, then manufacturing precision is improved, but deposited material accumulates and affects precision

Engineering Contradiction:

Improvewrite pole taper angle precisionVSAvoiddeposited material accumulation

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent divides the write pole structure into multiple segments with different taper angles along its length. The write pole includes a first portion with a first taper angle and a second portion with a second taper angle, allowing different sections to serve different functional purposes while managing material accumulation effects

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different taper angles to different local regions of the write pole. The first portion has a first taper angle optimized for one function, while the second portion has a second taper angle optimized for another function, particularly to control trailing edge magnetic fields and manage deposited material accumulation in specific areas

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the write pole thickness is minimized to enhance data writing accuracy, then manufacturing precision is improved, but magnetic field control becomes more difficult

Engineering Contradiction:

Improvedata writing accuracyVSAvoidmagnetic field control

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a dynamic magnetic field distribution by varying the taper angle along the write pole length. This allows the magnetic field strength and distribution to be optimized at different positions, ensuring reliable field control even with reduced overall pole thickness

Inventive Principle:

Principle #15Dynamics

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 approach allows for improved magnetic field precision and reduced adjacent track interference, enhancing data writing accuracy and bit density in data storage devices by minimizing the thickness of the write pole and optimizing its position within the trench.

Implementation Method 1

at least one layer is deposited that forms a second trench sidewall with a continuous second taper angle

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Data Source

PatentUS8699183B2Write pole and shield with different taper angles

Publication Date: 2014.04.15 SEAGATE TECH LLC

AI summary

A first trench sidewall has a continuous first taper angle that terminates at a first plane. At least one layer may be deposited that forms a second trench sidewall with a continuous second taper angle that extends a predetermined depth past the first plane and is less than the first taper angle. A write pole may then be formed on the second trench sidewall with the write pole being closer to the first trench sidewall at the predetermined depth than at the first plane.