Write Head Coil Structure for High Data Rate
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Solution Overview
Problem
In magnetic memory storage, the demand for higher data rate and density poses challenges in designing magnetic write heads, leading to poorer signal-to-noise ratio, larger transition curvature, and reliability issues due to increased switching speed and magnetic field degradation.
Innovation Solution
A write head design featuring a two-turn coil structure around the write pole, reducing the core length and power usage, which enhances switching speed and efficiency while minimizing erasure field and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the switching speed is increased to achieve higher data rate, then the data rate is improved, but the magnetic field degradation and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent changes the geometric parameters of the write head, specifically reducing the core length to 4 micrometers or less and optimizing the coil structure with no more than two active turns on the trailing side. These parameter changes enable faster magnetic field switching while maintaining field strength and signal quality, thereby improving data rate without degrading the signal-to-noise ratio
2Speed
If the core length is reduced to improve switching speed, then the switching speed is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes the core length parameter (4 micrometers or less) as a design constraint from the outset, integrating this precision requirement into the overall write head design and manufacturing process. By defining the target dimension early in the design phase, the manufacturing process can be optimized accordingly, reducing the adverse impact of precision requirements
3Use of energy by moving object
If the coil power is reduced to improve efficiency, then the energy efficiency is improved, but the magnetic field strength decreases
Solution Approach 1:
The patent optimizes the coil structure parameters, specifically using no more than two active turns on the trailing side with optimized dimensions and positioning. This parameter optimization allows the coil to generate sufficient magnetic field strength with reduced current, thereby reducing power consumption while maintaining the necessary magnetic field strength for effective writing
Solution Approach 2:
The patent replaces traditional coil configurations with an optimized coil structure that uses magnetic circuit optimization instead of simply increasing coil turns or current. This substitution allows achieving the same magnetic field strength with lower power consumption by improving the magnetic flux path efficiency
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 two-turn coil configuration improves high data rate performance by reducing magnetic field rise time, lowering coil power, and increasing track density, thus enhancing the signal-to-noise ratio and reliability of the recording process.
Implementation Method 1
A coil is included to generate magnetic flux through the main and return poles in response to a current conducted through the coil
Data Source
AI summary
A write head having a main pole having a pole tip, the main pole having a leading side and a trailing side; and a coil structure around the main pole, the coil structure having no more than two active turns on the trailing side. A non-active, or dummy turn, may be present.