Magnetic Recording Medium Layer Thickness and Coercive Force Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic recording media face challenges in enhancing electromagnetic conversion characteristics, particularly in achieving optimal coercive forces and particle dispersibility to improve recording density and signal quality.
Innovation Solution
A tape-shaped magnetic recording medium is designed with a specific configuration, including a base, nonmagnetic layer, and magnetic layer, where the magnetic layer has an average thickness of not more than 90 nm, magnetic powder with an aspect ratio of 1.0 to 3.0, and coercive forces optimized to satisfy Hc2/Hc1 ≤ 0.8, along with a nonmagnetic layer thickness of not more than 1.1 μm and nonmagnetic powder with an average particle volume of not more than 2.0×10−5 μm3.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnetic layer thickness is reduced to enhance electromagnetic conversion characteristics, then recording density and signal quality improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the magnetic layer thickness to 90 nm or less and optimizing the coercive force ratio (Hc2/Hc1 ≤ 0.8) to achieve optimal electromagnetic conversion characteristics while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses composite materials by combining magnetic powder with specific aspect ratio (1.0 to 3.0) and coercive force characteristics with a nonmagnetic layer containing nonmagnetic powder with controlled particle volume (≤ 2.0×10−5 μm3) to create a layered structure that achieves both thinness and high electromagnetic conversion efficiency
2Manufacturing precision
If barium ferrite magnetic powder dispersibility is enhanced to improve electromagnetic conversion characteristics, then recording density increases, but particle size control becomes more difficult
Solution Approach 1:
The patent applies local quality by using nonmagnetic powder with specifically controlled local properties (average particle volume ≤ 2.0×10−5 μm3) in the nonmagnetic layer to influence the magnetic layer's electromagnetic characteristics without requiring complex particle size control in the magnetic powder itself
Solution Approach 2:
The patent changes the parameter approach by controlling the particle volume of nonmagnetic powder in the nonmagnetic layer rather than focusing on magnetic powder particle size, simplifying the manufacturing process while achieving optimal electromagnetic conversion characteristics
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 electromagnetic conversion characteristics, leading to improved recording density and signal quality by optimizing coercive forces and particle dispersibility, thereby achieving better C/N ratios.
Implementation Method 1
enhancement of electromagnetic conversion characteristics
Data Source
AI summary
A tape-shaped magnetic recording medium includes a base, a nonmagnetic layer that is provided on the base and contains a nonmagnetic powder, and a magnetic layer that is provided on the nonmagnetic layer and contains a magnetic powder. In the magnetic recording medium, the magnetic layer has an average thickness of not more than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, a coercive force Hc1 in a perpendicular direction is not more than 3,000 Oe, the coercive force Hc1 in the perpendicular direction and a coercive force Hc2 in a longitudinal direction satisfy the relation of Hc2/Hc1≤0.8, the nonmagnetic layer has an average thickness of not more than 1.1 μm, and the nonmagnetic powder has an average particle volume of not more than 2.0×10−5 μm3.