Magnetic Head Conductive Layers for Write Gap Optimization
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Solution Overview
Problem
Current magnetic recording and reproducing devices face challenges in increasing recording density due to limitations in the magnetic head's ability to effectively apply a magnetic field to the recording medium, especially when the write gap is reduced.
Innovation Solution
The magnetic head incorporates a magnetic pole, a first shield, a magnetic layer, a first conductive layer (such as Cu, Ag, Au, Al, or Cr) between the magnetic pole and the first shield, and a second conductive layer (such as Ta, Pt, W, Ru, Mo, Ir, Rh, or Pd) at specific positions, with a current flowing from the first conductive layer toward the second conductive layer, which reverses the magnetization of the magnetic layer, allowing for effective magnetic field application to the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the write gap is reduced to increase recording density, then the recording density is improved, but the magnetic field application effectiveness deteriorates
Solution Approach 1:
The patent segments the magnetic head structure into multiple functional layers: magnetic pole, first shield, magnetic layer, first conductive layer, and second conductive layer. This segmentation allows each layer to perform its specific function optimally, with the conductive layers specifically designed to manage magnetic field distribution and reversibility, thus maintaining magnetic field application effectiveness even when the write gap is reduced for higher recording density.
Solution Approach 2:
The patent changes the magnetic state parameter of the magnetic layer by applying current to reverse its magnetization direction. This parameter change (from one magnetization state to another) enables the magnetic head to effectively apply magnetic fields to the recording medium even with a reduced write gap, thereby resolving the contradiction between improved recording density and maintained magnetic field application effectiveness.
2Reliability
If multiple conductive layers are added to reverse magnetization, then the magnetic field application is improved, but the device complexity increases
Solution Approach 1:
The magnetic layer serves multiple functions: it acts as a magnetic barrier between the magnetic pole and first shield, and simultaneously serves as a conductive path for current flow to reverse magnetization. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving improved magnetic field application effectiveness.
Solution Approach 2:
The patent merges the magnetic shielding function and the current conduction function into the same structural framework. The first conductive layer and second conductive layer are integrated with the magnetic pole and shield structure, combining magnetic field management and electrical conduction in a unified design, thus achieving improved reliability without excessive complexity increase.
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 enhances the recording density by ensuring that the magnetic field is effectively applied to the recording medium, even when the write gap is reduced, by reversing the magnetization of the magnetic layer and optimizing the electrical resistance for efficient information recording.
Implementation Method 1
a current flowing from the first conductive layer toward the second conductive layer, which reverses the magnetization of the magnetic layer, allowing for effective magnetic field application to the recording medium
Data Source
AI summary
According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, a first conductive layer, and a second conductive layer. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer includes at least one of Cu, Ag, Au, Al and Cr, and is provided between the magnetic pole and the first shield. A direction from the first conductive layer toward the magnetic layer crosses a first direction from the magnetic pole toward the first shield. A second conductive layer includes at least one of Ta, Pt, W, Ru, Mo, Ir, Rh, and Pd and is provided at one of a first position or a second position. The first position is between the first conductive layer and the first shield. The second position is between the magnetic pole and the first conductive layer.