Write Assist Stack for Magnetic Recording Head Heat Dissipation
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Solution Overview
Problem
Magnetic recording heads in hard disk drives face reliability issues due to increased temperature and resistance caused by high current usage, leading to degradation and potential breakdown, limiting their ability to handle larger current amounts without failing.
Innovation Solution
The design incorporates a write assist stack with layers of varying cross-track widths and an electrically insulating layer to dissipate heat and reduce resistance, including a spin torque layer, notch layer, and spin polarization layer, along with a non-conductive material to act as a heat sink, enhancing the magnetic recording head's performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher amounts of current are applied to the magnetic recording head to improve performance, then the performance is improved, but the temperature and resistance increase causing degradation and reduced reliability
Solution Approach 1:
The patent introduces a write assist stack as an intermediary component between the main pole and hot seed layer. This stack includes a seed layer, spin torque layer, and notch layer that work together to assist the magnetic recording process, enabling the system to achieve the desired magnetic writing effect with lower current through the main pole, thereby reducing heat generation and improving reliability while maintaining performance
Solution Approach 2:
The patent modifies the structural parameters of the magnetic recording head by creating a write assist stack with specific layer configurations and varying cross-track widths. The spin torque layer has a narrower cross-track width than the seed and notch layers, creating a geometric parameter change that optimizes the magnetic field distribution and reduces the current required for effective magnetic recording
2Power
If higher amounts of current are applied to the magnetic recording head to improve performance, then the performance is improved, but the magnetic recording head degrades at the media facing surface
Solution Approach 1:
The write assist stack acts as a protective intermediary structure that distributes the magnetic writing function across multiple layers. The spin torque layer, with its narrower width, concentrates the magnetic effect where needed while the wider seed and notch layers provide structural support and heat dissipation pathways, protecting the main pole from degradation at the media facing surface
Solution Approach 2:
The patent employs a composite structure consisting of multiple material layers with different properties. The write assist stack combines ferromagnetic materials (seed layer, spin torque layer) with non-magnetic materials (notch layer), creating a composite structure that optimizes both magnetic performance and structural integrity, reducing degradation at the media facing surface
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 higher current application without degrading the magnetic recording head, reducing temperature and resistance, thereby enhancing the device's reliability and performance by effectively managing heat dissipation and material integrity.
Implementation Method 1
the write assist stack comprises a seed layer, a spin torque layer, and a notch layer
Implementation Method 2
an electrically insulating layer disposed adjacent to the write assist stack between the hot seed layer and the main pole
Data Source
AI summary
The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a write assist stack disposed between the main pole and the hot seed layer. In one embodiment, the write assist stack comprises a seed layer, a spin torque layer, and a notch layer. One or more of the seed layer and the notch layer have a first cross-track width and the spin torque layer has a second cross-track width less than the first cross track width. In another embodiment, the write assist stack comprises a seed layer, a spin polarization layer, and a notch layer. One or more of the seed layer and the notch layer have a first cross-track width and the spin polarization layer has a second cross-track width less than the first cross track width.