Magnetic Sensor Lamination With Coupling Layer For Magnetoresistance
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Solution Overview
Problem
Data storage devices face challenges in achieving high data capacity and transfer rates due to strained reader performance and unwanted noise, which adversely affect magnetoresistive ratios, especially in reduced form factor and increased areal resolution devices.
Innovation Solution
A magnetically responsive lamination is constructed with a spacer layer between ferromagnetic free layers, incorporating a coupling layer to enhance the magnetoresistive ratio (MR), allowing for tuning of performance characteristics such as magnetic moment and magnetostriction without increasing the reader's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetically responsive lamination is constructed with a spacer layer between ferromagnetic free layers, then the magnetoresistive ratio (MR) is enhanced, but the device complexity increases
Solution Approach 1:
The ferromagnetic free layer is segmented into multiple sub-layers (first ferromagnetic sub-layer, second ferromagnetic sub-layer) separated by a non-magnetic spacer layer. This segmentation allows independent optimization of each sub-layer's magnetic properties while maintaining overall magnetic coupling, thereby enhancing the magnetoresistive ratio without requiring a complete redesign of the entire magnetic stack structure
Solution Approach 2:
A non-magnetic spacer layer is introduced as an intermediary between the first and second ferromagnetic sub-layers. This spacer layer acts as a magnetic decoupling medium that prevents direct magnetic interaction between the sub-layers, allowing each to contribute independently to the magnetoresistive effect while maintaining structural integrity of the lamination
2Volume of moving object
If the reader's size is reduced for compact form factor, then the device portability is improved, but the data capacity and transfer rates are strained
Solution Approach 1:
The magnetic stack is extended in the vertical dimension by adding multiple ferromagnetic sub-layers and spacer layers, creating a multi-layered structure. This vertical expansion allows the reader to achieve high data capacity and transfer rates through enhanced magnetoresistive effects without increasing the lateral footprint, thereby maintaining a compact form factor while improving performance
3Measurement precision
If ferromagnetic free layers are used to enhance magnetic flux, then the data sensing accuracy is improved, but unwanted noise is generated
Solution Approach 1:
The harmful magnetic interaction and noise generation are extracted and isolated into a separate non-magnetic spacer layer, which is removed from the primary magnetic sensing path. This allows the ferromagnetic sub-layers to generate sufficient magnetic flux for accurate data sensing while the spacer layer prevents the propagation of unwanted noise and magnetic interference between layers
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 achieves enhanced data storage capacity and transfer rates with improved areal resolution and reduced noise, enabling accurate data sensing and increased magnetic flux while maintaining a compact form factor.
Implementation Method 1
at least one ferromagnetic free layer can have a coupling layer that enhances magnetoresistance ratio (MR) of the magnetically responsive lamination
Implementation Method 2
a coupling layer that enhances magnetoresistance ratio (MR)
Implementation Method 3
a spacer layer disposed between a first and second ferromagnetic free layer
Data Source
AI summary
Various embodiments of the present invention are generally directed to a magnetically responsive lamination that may be constructed with a spacer layer disposed between a first and second ferromagnetic free layer. At least one ferromagnetic free layer can have a coupling sub-layer that enhances magnetoresistance ratio (MR) of the magnetically responsive lamination.