Granular Magnetic Recording Medium Layered Structure
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Solution Overview
Problem
Conventional magnetic recording media face challenges in further improving recording density due to difficulties in reducing magnetic crystal grain size, achieving uniformity, and reducing crystal orientation variation.
Innovation Solution
A magnetic recording medium with a non-magnetic granular layer and a recording layer comprising a first and second granular magnetic layer, where the non-magnetic material separating metal grains differs between layers, allowing for reduced grain size, uniformity, and reduced crystal orientation variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of magnetic crystal grains is reduced to improve recording density, then recording density is improved, but it becomes difficult to maintain uniform grain sizes and reduce crystal orientation variation
Solution Approach 1:
The recording layer is divided into multiple granular magnetic layers (first granular magnetic layer, second granular magnetic layer, etc.) stacked in the perpendicular direction. Each layer contains magnetic crystal grains separated by non-magnetic materials, creating a segmented structure that allows independent control of grain size and orientation in each layer while maintaining overall recording density
Solution Approach 2:
Different non-magnetic materials are used to separate magnetic grains in different granular magnetic layers. This local differentiation allows optimization of grain size, uniformity, and crystal orientation in each specific layer according to its functional requirements, while the overall structure achieves high recording density
2Quantity of substance
If a single granular magnetic layer is used, then the structure is simple, but recording density and signal quality cannot be further improved
Solution Approach 1:
The invention transitions from a single-plane granular magnetic layer to a multi-layer stacked structure in the perpendicular dimension. This dimensional expansion allows additional recording capacity without increasing in-plane complexity, effectively improving recording density while maintaining manageable structural complexity through systematic layering
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 enhances recording density by reducing magnetic crystal grain size, achieving uniformity, and minimizing crystal orientation variation, thereby improving signal quality and storage capacity.
Implementation Method 1
a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer
Implementation Method 2
Magnetic flux generated from the magnetic head penetrates the recording layer perpendicularly towards the back layer, and magnetizes the recording layer in the perpendicular direction
Data Source
AI summary
A magnetic recording medium includes a non-magnetic granular layer, and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer.