Perpendicular Magnetic Recording Medium With Oxide Isolation
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Solution Overview
Problem
Current magnetic recording media face challenges in achieving high-density recording due to adjacent data signals being too close, leading to signal interference and degradation of recording/reproduction characteristics, particularly when processing fine patterns which can result in film damage and oxidation of magnetic elements like Co.
Innovation Solution
A perpendicular magnetic recording medium with a substrate and a magnetic recording layer containing platinum, iron, and cobalt, along with additive components like titanium, silicon, or tungsten, where the side surfaces of the magnetic layers are oxidized to form oxide layers and nonmagnetic layers are inserted between them, enhancing recording density and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a magnetic film is processed into fine patterns to increase recording density, then recording capacity is improved, but the film may be damaged during processing and oxidation of magnetic elements occurs
Solution Approach 1:
A protective coating layer is formed on the magnetic film before patterning processing. This preliminary protective action prevents oxidation and damage during subsequent etching and processing steps, allowing fine patterns to be created without compromising film integrity
Solution Approach 2:
A protective coating layer acts as an intermediary between the magnetic film and the processing environment. This intermediate layer shields the magnetic elements from oxidation during processing while allowing the desired fine patterns to be formed underneath
2Quantity of substance
If adjacent data signals are placed closer to increase capacity, then recording density is improved, but signal interference occurs and recording/reproduction characteristics deteriorate
Solution Approach 1:
The magnetic recording layer is divided into discrete isolated magnetic islands or bits separated by nonmagnetic material. This segmentation prevents magnetic interaction between adjacent data signals, eliminating signal interference while maintaining high recording density
Solution Approach 2:
The medium structure is made non-uniform with localized magnetic recording regions separated by nonmagnetic regions. This local differentiation ensures that each magnetic island operates independently without interfering with neighbors, preserving signal quality at high densities
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 solution improves signal quality by reducing noise and maintaining recording/reproduction characteristics, allowing for higher recording densities while protecting the magnetic film from damage during processing.
Implementation Method 1
the additive component may be titanium, silicon, aluminum, or tungsten. In the magnetic recording layer, the additive component forms an oxide layer by oxidizing
Data Source
AI summary
A perpendicular magnetic recording medium according to an embodiment includes a substrate and perpendicular magnetic recording layer. The perpendicular magnetic recording layer includes a recording portion and non-recording portion. The recording portion has patterns regularly arranged in the longitudinal direction, and includes magnetic layers containing Fe or Co and Pt as main components, and at least one additive component selected from Ti, Si, Al, and W. The non-recording portion includes oxide layers formed by oxidizing the side surfaces of the magnetic layers, and nonmagnetic layers formed between the oxide layers.