Magnetic Recording Tape Seed Layer Optimization
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Solution Overview
Problem
Current magnetic recording tapes face challenges in achieving favorable crystal orientation characteristics and high signal-to-noise ratios (SNR) due to limitations in the configuration of underlayers and seed layers, which affect the recording capacity and reliability of the magnetic media.
Innovation Solution
A magnetic recording tape configuration is introduced, featuring a base layer with a flexible long film, a magnetic layer, an underlayer containing Co and Cr with a specific atomic ratio, and a seed layer with Ti, O, or Ti-Cr-O composition, optimized to enhance crystal orientation and SNR. The underlayer and seed layer are strategically positioned between the magnetic layer and the base layer, with the seed layer having a thickness of 5 nm to 20 nm and containing Ti and O, or Ti-Cr-O, to improve adhesion and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional underlayer configuration is used, then the manufacturing process is simple, but the crystal orientation characteristics are insufficient and SNR is low
Solution Approach 1:
The underlayer is divided into multiple functional layers with different compositions and thicknesses. Each layer serves a specific purpose in promoting crystal orientation, allowing the system to achieve high SNR through coordinated action of segmented layers rather than a single complex layer
Solution Approach 2:
The underlayer employs composite material structures combining different metallic elements in specific ratios. This composite approach enables the underlayer to provide multiple functions simultaneously, improving crystal orientation characteristics while managing structural complexity through material composition rather than geometric complexity
2Manufacturing precision
If the seed layer thickness is increased, then adhesion and crystal orientation are improved, but the overall tape thickness and device complexity increase
Solution Approach 1:
The seed layer thickness is optimized to a specific range that balances adhesion promotion and crystal orientation enhancement without excessive thickness. This parameter optimization allows the system to achieve high SNR with a controlled, moderate seed layer thickness rather than requiring very thick layers
Solution Approach 2:
The seed layer is designed with specific local properties including controlled thickness, composition, and positioning directly beneath the magnetic layer. This localized optimization of quality parameters enables the seed layer to perform its adhesion and orientation functions efficiently without requiring uniform thickening throughout the entire structure
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 configuration significantly enhances the crystal orientation characteristics and achieves a high SNR, leading to improved recording density and reliability of the magnetic recording tape.
Implementation Method 1
the underlayer contains at least Co and Cr, and has an average atomic number ratio represented by the following formula (1): Co(100-y)Cry (where y is within a range of 37≤y≤45.)
Implementation Method 2
focusing on the fact that Ru has a hexagonal close-packed structure as in Co (cobalt) and Ru has a lattice constant close to that of Co, the crystal orientation of the Ru layer has been devised to enhance the crystal orientation characteristics of the magnetic layer
Implementation Method 3
the seed layer formed on the base layer has a film thickness of 5 nm or more and 20 nm or less, and contains Ti and O and has an average atomic number ratio represented by the following formula (2): Ti(100-x)Ox (where x≤10.)
Data Source
AI summary
To provide a magnetic recording tape and the like that have excellent magnetic properties and exhibit a favorable SNR. There are provided a magnetic recording tape and the like including at least: a base layer that includes a long film having flexibility; and a magnetic layer formed on a side of one main surface of the base layer, in which an under layer and a seed layer are provided in the stated order from a side of the magnetic layer toward a side of the base layer between the magnetic layer and the base layer, the underlayer contains at least Co and Cr, and has an average atomic number ratio represented by the following formula (1): Co(100-y)Cry (where y is within a range of 37≤y≤45.), and the seed layer formed directly on the base layer has a film thickness of 5 nm or more and 30 nm or less, and contains Ti and O and has an average atomic number ratio represented by the following formula (2): Ti(100-x)Ox (where x≤10.) or contains Ti—Cr—O and has an average atomic number ratio represented by the following formula (3): (TiCr)(100-x)Ox (where x≤10.).