Magnetic Write Head Bump Structure for Perpendicular Electron Flow
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Solution Overview
Problem
Magnetic data storage systems face challenges in maintaining stable magnetic signals at high data densities due to the reduced size of magnetic bits and write heads, leading to instability and data loss, as smaller write heads produce weaker magnetic fields, making it difficult to record on media with high coercivity and anisotropy.
Innovation Solution
A magnetic write head with a tapered trailing edge and a non-magnetic, electrically conductive bump structure is used to direct electrons perpendicular to the spin torque oscillator, enhancing its performance by preventing suboptimal electron flow at inclined angles, thereby improving the magnetic write field's efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the write head size is reduced to accommodate high data density, then the data storage capacity increases, but the magnetic write field strength decreases making it difficult to record on high coercivity media
Solution Approach 1:
The patent employs a composite structure combining magnetic materials (write pole, return pole) with non-magnetic materials (underlayer, cap layer) to create a write head system that optimizes both field strength and geometric constraints for high-density recording
Solution Approach 2:
The write head is segmented into distinct functional components including the write pole, return pole, magnetic underlayer, and magnetic cap layer, allowing each component to be optimized independently for its specific function while working together to overcome the size-strength tradeoff
2Quantity of substance
If the magnetic bit size is reduced to increase data density, then the storage capacity increases, but the magnetic signal stability decreases leading to data loss
Solution Approach 1:
The patent applies local quality enhancement by creating a concentrated magnetic write field at the pole tip region through the optimized geometric configuration and material composition, allowing strong localized magnetization despite the overall small size of the write head and magnetic bits
3Quantity of substance
If the write head size is reduced, then the data storage capacity increases, but the ability to produce sufficient write field decreases
Solution Approach 1:
The patent utilizes the vertical dimension by implementing a layered structure with magnetic underlayer and magnetic cap layer that extend the magnetic circuit in the depth direction, enabling enhanced write field production through increased magnetic path utilization rather than relying solely on lateral pole tip dimensions
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 solution ensures optimal performance of the spin torque oscillator by aligning electron flow perpendicular to its plane, enhancing the magnetic write field's strength and stability, enabling effective recording at high data densities.
Implementation Method 1
A magnetic write head with a tapered trailing edge and a non-magnetic, electrically conductive bump structure is used to direct electrons perpendicular to the spin torque oscillator, enhancing its performance
Implementation Method 2
A non-magnetic, electrically conductive layer is formed on a portion of the magnetic oscillator that is removed from the media facing surface
Implementation Method 3
When current flows through the coil, a resulting magnetic field causes a magnetic flux to flow through the coil, which results in a magnetic write field emitting from the tip of the write pole
Implementation Method 4
A magnetic shield is then formed over the magnetic oscillator structure and the non-magnetic, electrically conductive layer
Data Source
AI summary
A magnetic write head having a write pole with a tapered trailing edge and a magnetic oscillator formed on the trailing edge of the write pole. The magnetic oscillator is sandwiched between the magnetic write pole and a trailing magnetic shield. The write head also includes a non-magnetic, electrically conductive bump structure located over a back portion of the magnetic oscillator between the magnetic oscillator and the trailing magnetic shield. The presence of the non-magnetic, electrically conductive bump structure causes electrons to properly flow through the magnetic oscillator in a direction that is generally perpendicular to the plane of the magnetic oscillator, even when the magnetic oscillator is formed on an inclined plane on the tapered trailing edge of the write pole. This thereby ensures optimal performance of the magnetic oscillator.