Lateral Spin Valve Reader Shield Spacing Reduction
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Solution Overview
Problem
The increasing demand for higher data density in magnetic data storage devices poses a challenge due to the limited ability to reduce the spacing between magnetic shields in traditional read transducers, such as GMR or TMR sensors, which restricts further miniaturization.
Innovation Solution
The implementation of a lateral spin valve reader with a detector and spin injector in the same plane, along with a channel layer extending between them, significantly reduces the shield-to-shield spacing, allowing for more compact designs and enhanced data density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional MR sensor structures (GMR or TMR sensors) are used with magnetic shields, then magnetic field detection capability is maintained, but the spacing between shields cannot be reduced further, limiting data density increase
Solution Approach 1:
The patent transitions from a conventional vertical stack configuration to a lateral configuration where the detector and spin injector are positioned in the same plane, with the channel layer extending horizontally between them. This dimensional change allows the shield-to-shield spacing to be reduced to approximately the thickness of the channel layer plus detector layer, dramatically decreasing the spacing compared to traditional vertical stack designs.
2Quantity of substance
If the size and spacing of magnetic bits are decreased to increase data density, then data storage capacity increases, but the read sensor structure becomes difficult to scale due to shield spacing constraints
Solution Approach 1:
By reconfiguring the sensor elements (detector and spin injector) to lie in the same plane with a lateral channel connecting them, the design eliminates the need for thick vertical stacks between shields. This lateral configuration simplifies scaling to smaller dimensions and enables reduced bit spacing and size, directly supporting increased data storage capacity.
Solution Approach 2:
The sensor is segmented into distinct functional layers: a detector layer, a channel layer, and a spin injector layer, which can be independently optimized and fabricated. This segmentation allows each layer to be precisely controlled in thickness and composition, facilitating scaling to smaller dimensions while maintaining performance.
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 enables a drastic reduction in shield-to-shield spacing, facilitating higher data density storage while maintaining effective magnetic field detection capabilities, suitable for advanced data storage systems like hard disc drives.
Implementation Method 1
The spin injector injects electron spins into the channel layer, which transports the spins to the detector
Implementation Method 2
The MR sensor has an electrical resistance that changes in response to an external magnetic field
Data Source
AI summary
A lateral spin valve reader includes a detector located proximate to a bearing surface of the reader, a spin injector located away from the bearing surface, and a channel layer that substantially extends from the detector to the spin injector. The channel layer and the detector are substantially in a same plane.