Magnetic Media Intermediate Layer Grain Segregation
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Solution Overview
Problem
Conventional magnetic recording disk drives face challenges in achieving high areal densities due to noise and signal-to-noise ratio issues, necessitating improved magnetic media performance for efficient data storage and retrieval.
Innovation Solution
The implementation of a magnetic recording media with an intermediate layer comprising multi-phase alloys, where a secondary phase segregates to grain boundaries, reducing grain size and distribution, thereby enhancing coercive squareness, nucleation field, coercivity, and thermal stability, and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic recording media is used, then manufacturing is simpler, but signal-to-noise ratio deteriorates at high areal densities
Solution Approach 1:
The patent employs composite magnetic media consisting of multiple layers including a magnetic recording layer, intermediate layer, and smoothing layer. Each layer has specific composition and function, creating a composite structure that improves signal-to-noise ratio while managing the complexity through systematic layer design
Solution Approach 2:
The patent applies local quality by creating an intermediate layer with specific properties (amorphous or nanocrystalline structure, controlled composition) that differs from the magnetic recording layer. This localized structural differentiation addresses noise issues at the grain boundary level without requiring complete restructuring of the entire media
2Quantity of substance
If grain size is reduced to increase areal density, then storage capacity improves, but noise increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent changes physical parameters by controlling the intermediate layer's composition, crystalline structure, and thickness to optimize grain size distribution. By adjusting these parameters, the media achieves smaller effective grain sizes for higher areal density while maintaining adequate signal-to-noise ratio through controlled magnetic properties
Solution Approach 2:
The patent utilizes phase transitions by creating an intermediate layer that can be amorphous, nanocrystalline, or partially crystalline. This phase control allows manipulation of grain boundary properties and magnetic characteristics to simultaneously achieve high areal density and acceptable noise levels
3Quantity of substance
If perpendicular magnetic recording is implemented to achieve high density, then areal density improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces an intermediate layer as a mediator between the magnetic recording layer and the substrate or smoothing layer. This intermediate layer acts as a buffer that relaxes manufacturing precision requirements by providing a transition zone that can accommodate variations in layer thickness while maintaining the desired perpendicular magnetic recording properties
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 approach results in improved performance at higher areal densities by reducing noise and enhancing signal-to-noise ratio, thereby addressing the limitations of conventional magnetic recording disk drives.
Implementation Method 1
a secondary phase segregates to grain boundaries
Implementation Method 2
Perpendicular magnetic recording (PMR) writers
Data Source
AI summary
A method and system provide a magnetic recording media usable in a magnetic storage device. The magnetic recording media includes a substrate, at least one intermediate layer and a magnetic recording stack for storing magnetic data. The intermediate layer(s) include a majority phase having a first diffusion constant and a secondary phase having a second diffusion constant greater than the first diffusion constant. The magnetic recording stack residing on the intermediate layer such that the at least one intermediate layer is between the substrate and the magnetic recording stack.