Magnetic Recording Array Wiring for Lower Electromigration
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Solution Overview
Problem
The common wiring in magnetic recording arrays, used for both write and read operations, is prone to deterioration due to its high electrical resistance and susceptibility to electromigration.
Innovation Solution
The common wiring is designed with lower electrical resistance, larger cross-sectional area, and higher activation energy compared to the write and read wirings, using materials like Si, Ti, Cr, Ta, and Ir to reduce electromigration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common wiring is used for both write and read operations, then the device complexity is reduced, but the wiring deteriorates more easily due to higher electrical resistance and electromigration
Solution Approach 1:
The patent applies local quality by making the common wiring have different properties (lower electrical resistance, larger cross-sectional area) compared to write and read wirings. This localized enhancement of the common wiring's physical characteristics reduces electromigration and deterioration while maintaining the simplified three-wiring structure for magnetic recording operations.
2Manufacturing precision
If the common wiring has standard cross-sectional area, then the manufacturing precision is maintained, but the electrical resistance is high causing increased deterioration
Solution Approach 1:
The patent changes the physical parameters of the common wiring by increasing its cross-sectional area compared to write and read wirings. This parameter change reduces the electrical resistance and current density in the common wiring, thereby reducing electromigration effects and improving reliability while maintaining manufacturing precision through controlled dimensional specifications.
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 minimizes the deterioration of the common wiring by reducing the probability of void formation and electromigration, ensuring reliable operation in magnetic recording arrays.
Implementation Method 1
The common wiring has an electrical resistance lower than the electrical resistance of the write wiring or the read wiring
Implementation Method 2
a first ferromagnetic layer stacked on the wiring
Implementation Method 3
The resistance value of the magnetoresistance effect element changes depending on a difference in the relative angle of magnetization directions between two magnetic films
Data Source
AI summary
A magnetic recording array includes a plurality of spin elements arranged in a matrix, each spin element including a wiring and a stacked body that includes a first ferromagnetic layer stacked on the wiring, a plurality of write wirings connected to first ends of the respective wirings in the plurality of spin elements, a plurality of read wirings connected to the respective stacked bodies in the plurality of spin elements, and a plurality of common wirings connected to second ends of the wirings in the respective spin elements belonging to the same row, wherein the common wiring has an electrical resistance lower than the electrical resistance of the write wiring or the read wiring.