Magnetic Recording Medium Orientation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic recording media with flexible base materials face challenges in achieving both high recording and playback characteristics and reliability due to the trade-off between surface smoothness and sliding performance, where improving one aspect often compromises the other.
Innovation Solution
A magnetic recording medium with a flexible base material, a lower coating layer, and a recording layer, where the orientation strength Δθ50 of the recording layer is set between 5° and 10° by adjusting the surface properties, such as the arithmetic average roughness of the base material and the lower coating layer, and optionally incorporating a soft magnetic underlayer or intermediate layers like Ru, to balance recording and playback characteristics and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface smoothness of the base material and lower coating layer is improved, then the recording and playback characteristics are improved, but the sliding performance deteriorates and reliability decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the arithmetic average roughness Ra within 0.05 nm to 2.0 nm and the orientation strength Δθ50 within 5° to 10°, transforming the surface properties to achieve both smoothness and sliding performance simultaneously
Solution Approach 2:
The patent uses composite material structure with multiple layers (base material, lower coating layer, recording layer, protective layer) where each layer has specific material properties and thicknesses to achieve the balance between surface smoothness and sliding performance
2Manufacturing precision
If the orientation strength Δθ50 of the recording layer is increased to improve recording density, then the recording characteristics improve, but the playback characteristics and reliability deteriorate
Solution Approach 1:
The patent optimizes the orientation strength parameter Δθ50 to a specific range of 5° to 10° through controlled surface roughness and layer structure, achieving the optimal balance between recording density and playback characteristics
Solution Approach 2:
The patent uses X-ray diffraction measurement method to precisely measure and control the orientation strength of magnetic atoms, replacing traditional mechanical adjustment methods with precise physical measurement and control
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 enables the magnetic recording medium to achieve both favorable recording and playback characteristics and reliability by optimizing the orientation of magnetic crystals and reducing friction, thereby enhancing the medium's performance and durability.
Implementation Method 1
the easy axis of magnetization of magnetic body microcrystals inside a recording layer is oriented so as to be perpendicular with respect to a substrate
Implementation Method 2
Δθ50, which is an index of orientation dispersion, is suppressed to approximately 3 degrees by suppressing the orientation dispersion of the easy axis of magnetization
Implementation Method 3
in X-ray diffraction peaks, a value of Δθ50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method
Implementation Method 4
a value of Δθ50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured
Data Source
AI summary
A magnetic recording medium includes a base material which has flexibility, a lower coating layer, and a recording layer, in which, in X-ray diffraction peaks, a value of Δθ50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method is 5° or more to less than 10°.