Alternating Current Writing-Assistance Wire for Magnetic Recording
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Solution Overview
Problem
Current data storage technologies face limitations in increasing tracks per inch (TPI) and areal density capability due to challenges in writing data on high coercivity media, particularly in maintaining track center stability with changing polarity.
Innovation Solution
Incorporation of a writing-assistance wire positioned between the write pole tip and trailing shield in a down-track direction, with alternating current supply to enhance the write field and reduce stray magnetic fields, allowing for controlled data writing and narrower track widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If direct current is supplied to the writing-assistance wire, then the write field is enhanced, but the track center shifts with changing polarity
Solution Approach 1:
The patent applies periodic action by using alternating current instead of direct current to drive the writing-assistance wire. The alternating current reverses direction in sync with the write pole polarity changes, ensuring that the assist field always reinforces the write field in the correct direction. This periodic reversal prevents track center shift while maintaining field enhancement, as the wire's field contribution is synchronized with the write pole's polarity transitions.
Solution Approach 2:
The patent changes the electrical parameter of the writing-assistance wire from direct current to alternating current. This parameter change allows the wire to dynamically adjust its magnetic field contribution based on the write pole polarity, enhancing the write field strength while preventing track center migration through synchronized field reversal.
2Quantity of substance
If higher areal density is achieved through increased TPI, then data storage capacity is enhanced, but writing on high coercivity media becomes more difficult
Solution Approach 1:
The patent merges the functionality of the write pole and the writing-assistance wire into a unified writing system. The writing-assistance wire is positioned in close proximity to the write pole and operates in coordination with it, combining their magnetic field contributions to achieve the necessary field strength for writing on high coercivity media while maintaining narrow track widths for high TPI.
Solution Approach 2:
The writing-assistance wire provides preliminary action by generating an assist field that prepares the magnetic medium for writing before the main write pole field is applied. This pre-conditioning of the medium reduces the effective coercivity barrier, making it easier to write data at high densities on high coercivity media.
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 improves TPI and areal density by maintaining track center stability and overcoming high coercivity media challenges, resulting in enhanced data storage capacity.
Implementation Method 1
a time-varying current is supplied to the writing-assistance wire to generate an assist field that augments a write field of a write pole
Implementation Method 2
writing-assistance wire positioned between the pole tip and the trailing shield in a down-track direction with alternating current supply to enhance the write field
Data Source
AI summary
A recording head for writing data on tracks of a data storage medium. The recording head includes a writer having a write pole and a trailing shield. The write pole includes a pole tip configured to write on the tracks of the data storage medium. The recording head also includes a writing-assistance wire that is positioned between the pole tip and the trailing shield in a down-track direction.