Spin Torque Layer Side Gap Magnetic Recording Head
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Solution Overview
Problem
Conventional magnetic recording devices face limitations in field and cross-track field gradients, leading to inefficiencies in data storage capacity and increased errors due to magnetic flux leaks from the main pole into side shields, which affect the operation of magnetic heads.
Innovation Solution
The implementation of a magnetic recording head design that includes a main pole, a shield hot seed layer, and adjacent materials such as spin torque layers and high polarization layers, which help in managing field gradients and minimizing flux leaks by optimizing the side gap distance and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the side gap distance from the main pole is decreased to improve field gradient, then field gradient is improved, but magnetic flux leaks from the main pole into the side shield which adversely affects head operation
Solution Approach 1:
A spin torque layer is introduced as an intermediary component between the main pole and the side shield. This layer mediates the magnetic field interaction by providing spin transfer torque that compensates for flux leakage while maintaining the reduced side gap distance, thus improving field gradient without suffering from harmful flux leaks
Solution Approach 2:
The patent changes the magnetic properties of the side gap region by introducing the spin torque layer with specific magnetization characteristics. This parameter change allows the side gap to maintain a small distance for improved field gradient while the altered magnetic parameters prevent flux leakage into the side shield
2Reliability
If shields are used to prevent excess magnetic flux from entering areas not being read, then data accuracy is improved, but device complexity increases
Solution Approach 1:
The spin torque layer is merged with the side gap structure, combining the functions of field gradient enhancement and flux leakage prevention into a single integrated component. This reduces overall device complexity while maintaining data accuracy, as the spin torque layer serves multiple functions simultaneously
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 design enhances data storage capacity per unit area, improves field and cross-track field gradients, and reduces errors during reading and writing operations by effectively managing magnetic flux, thereby improving the overall performance of magnetic recording systems.
Implementation Method 1
a second material positioned adjacent to the first material on the second side and the third side of the main pole, the second material comprised of a spin torque layer
Data Source
AI summary
A magnetic recording head is disclosed having a main pole, a shield hot seed layer positioned at a first side of the main pole, a first material positioned at both a second side and a third side of the main pole, the first material connected to the main pole, a second material positioned adjacent to the first material on the second side and the third side of the main pole, the second material comprised of a spin torque layer, a third material positioned adjacent to the second material on the second side and the third side of the main pole, a fourth material positioned adjacent to the third material on the second side and the third side of the main pole and a side shield connected on an exterior side of the fourth material.