Hexagonal Ferrite Magnetic Layer XRD Control
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Solution Overview
Problem
Magnetic recording media experience deterioration in electromagnetic conversion characteristics due to head attachment and spacing loss, leading to reduced reliability during repeated signal reproduction.
Innovation Solution
A magnetic recording medium comprising a non-magnetic support with a magnetic layer containing ferromagnetic hexagonal ferrite powder, an abrasive, and a binder, where the magnetic layer's XRD intensity ratio and squareness ratio are controlled to inhibit head and magnetic layer scraping, thereby maintaining stable electromagnetic conversion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an abrasive is added to the magnetic layer, then head attachment is removed and electromagnetic conversion characteristics are maintained, but the magnetic layer becomes more prone to scraping and deterioration
Solution Approach 1:
The invention changes the crystallographic parameters of the hexagonal ferrite by controlling the XRD intensity ratio Int(110)/Int(114) to be 0.5-4.0, which fundamentally alters the particle morphology and surface properties. This parameter change enables the magnetic layer to maintain both the ability to remove head attachment and resistance to scraping, resolving the contradiction between reliability and strength
Solution Approach 2:
The invention creates a composite magnetic layer system combining hexagonal ferrite particles with specific crystal structure, binder, and abrasive components. The synergistic interaction between these components allows the layer to simultaneously provide head attachment removal functionality while maintaining structural integrity and resistance to scraping during repeated head sliding
2Strength
If the magnetic layer is made harder to resist scraping, then magnetic layer durability improves, but head attachment accumulation increases causing spacing loss
Solution Approach 1:
By precisely controlling the XRD intensity ratio Int(110)/Int(114) to 0.5-4.0 and squareness ratio to 0.65-1.00, the invention optimizes the magnetic layer's surface properties and particle orientation. This creates an optimal balance where the layer is hard enough to resist scraping but has sufficient surface characteristics to prevent head attachment accumulation, resolving the contradiction between durability and head attachment resistance
3Duration of action of stationary object
If repeated reproduction is performed, then data storage functionality is maintained, but electromagnetic conversion characteristics deteriorate due to head sliding
Solution Approach 1:
The invention performs preliminary alignment of hexagonal ferrite particles during manufacturing, controlling their crystal orientation so that the easy axis of magnetization is substantially perpendicular to the magnetic layer surface. This preliminary action ensures that the magnetic layer is pre-configured to withstand repeated head sliding without deterioration, maintaining electromagnetic conversion characteristics throughout the reproduction cycles
Solution Approach 2:
The invention changes the magnetic anisotropy parameters by controlling the squareness ratio to 0.65-1.00 and XRD intensity ratio to 0.5-4.0, which fundamentally alters how the magnetic layer responds to mechanical stress from head sliding. This parameter change enables the layer to maintain stable electromagnetic conversion characteristics even after repeated reproduction operations
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 controlled XRD intensity ratio and squareness ratio in the magnetic layer prevent head scraping and magnetic layer deterioration, ensuring consistent electromagnetic conversion characteristics even with repeated head sliding, enhancing the medium's reliability for data storage.
Implementation Method 1
the ferromagnetic powder is ferromagnetic hexagonal ferrite powder
Implementation Method 2
determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method
Implementation Method 3
peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure
Data Source
AI summary
The magnetic recording medium has a non-magnetic support and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. The present invention also provides a method for manufacturing the magnetic recording medium.