Magnetic Recording Medium Layered Structure for High SNR
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Solution Overview
Problem
Current magnetic recording media face challenges in achieving a high signal-to-noise ratio (SNR) necessary for advanced data storage applications, particularly in high-density recording systems.
Innovation Solution
A magnetic recording medium is designed with a specific layered structure, including a substrate with a Cr, Ni, and Fe seed layer, a Co and O base layer with a columnar structure, and a Ru intermediate layer, optimized to enhance crystal orientation and granularity, resulting in improved SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional magnetic recording medium structure is used, then manufacturing simplicity is maintained, but the signal-to-noise ratio is insufficient for high-density recording
Solution Approach 1:
The magnetic recording medium is divided into multiple functional layers: a Cr, Ni, and Fe-containing seed layer with face-centered cubic lattice structure, a Co and O-containing base layer with columnar structure, and a Ru-containing intermediate layer. This segmentation allows each layer to perform its specific function (crystal orientation, granularity control, and interface optimization), thereby achieving high signal-to-noise ratio through structured complexity rather than material complexity
Solution Approach 2:
The invention optimizes specific parameters of each layer: the seed layer uses Cr, Ni, and Fe in specific proportions to achieve face-centered cubic lattice orientation; the base layer controls Co and O atomic concentration ratio and columnar structure dimensions; the intermediate layer uses Ru to optimize crystal growth. These parameter optimizations enable high signal-to-noise ratio while maintaining manufacturing feasibility through controlled composition ranges
2Quantity of substance
If high-density recording is implemented, then storage capacity increases, but signal-to-noise ratio deteriorates
Solution Approach 1:
The invention creates local quality variations within the magnetic recording layer by forming a columnar structure in the base layer with specific dimensions (average particle diameter 3-13 nm). This local structural differentiation provides uniform magnetic properties at the micro-scale, enabling high-density recording while maintaining sufficient signal-to-noise ratio through localized crystal grain control
Solution Approach 2:
The Ru-containing intermediate layer acts as a mediator between the Co and O base layer and the perpendicular recording layer. This intermediate layer facilitates optimal crystal growth and magnetic property transmission, allowing high-density recording to be achieved without compromising signal-to-noise ratio by buffering the interface 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
The proposed structure achieves a high SNR, enabling surface recording densities of 50 Gb/in² and data cartridge capacities of 50 TB or more, suitable for advanced recording and reproducing devices.
Implementation Method 1
a first layer, being provided on the substrate, containing Cr, Ni, and Fe, and having a face-centered cubic lattice structure with a (111) plane preferentially oriented so as to be parallel to a surface of the substrate
Implementation Method 2
a second layer, being provided on the first layer, containing Co and O, having a ratio of an atomic concentration of O to an average atomic concentration of Co of 1 or more, and having a column structure with an average particle diameter of 3 nm or more and 13 nm or less
Data Source
AI summary
A magnetic recording medium includes: an elongated substrate having flexibility; a first layer, being provided on the substrate, containing Cr, Ni, and Fe, and having a face-centered cubic lattice structure with a (111) plane preferentially oriented so as to be parallel to a surface of the substrate; a second layer, being provided on the first layer, containing Co and O, having a ratio of an average atomic concentration of O to an average atomic concentration of Co of 1 or more, and having a column structure with an average particle diameter of 3 nm or more and 13 nm or less; a third layer, being provided on the second layer, and containing Ru; and a perpendicular recording layer, being provided on the third layer.