Heat-Diffusing Layer for Heat-Assisted Particulate Magnetic Recording
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Solution Overview
Problem
Particulate magnetic recording media face challenges in achieving high-density recording while maintaining thermal stability and ease of writing due to their poor heat resistance, making heat-assisted recording impractical.
Innovation Solution
Incorporating a heat-diffusing layer with higher thermal conductivity than the magnetic layer between the nonmagnetic organic support and the magnetic layer to prevent heat from reaching underlying layers, thereby allowing for heat-assisted recording without compromising the medium's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the particle size of magnetic material is decreased to achieve higher density recording, then recording density is improved, but thermal stability deteriorates due to increased thermal fluctuation
Solution Approach 1:
The patent changes the physical state of the binder from solid to liquid by controlling the glass transition temperature to be below the recording temperature. This allows the binder to become fluid during heat-assisted recording, preventing particle aggregation and maintaining thermal stability while enabling high-density recording with small particles.
2Reliability
If the magnetocrystalline anisotropy Ku is increased to improve thermal stability, then thermal stability is improved, but coercive force increases making writing difficult
Solution Approach 1:
The patent utilizes temperature-dependent parameter changes by selecting a binder with glass transition temperature below the recording temperature. During recording, the binder becomes liquid, reducing coercive force and enabling easy writing. After recording, the binder solidifies, maintaining high Ku and thermal stability.
Solution Approach 2:
The patent introduces dynamic behavior to the binder system through temperature-controlled phase transition. The binder transitions from solid (providing structural stability) to liquid (providing ease of writing) and back to solid (maintaining stability), enabling the system to adapt its properties based on operational requirements.
3Ease of operation
If heat-assisted recording is applied to particulate magnetic recording media, then ease of writing is improved, but the medium deforms due to poor heat resistance of organic materials
Solution Approach 1:
The patent changes the thermal stability parameter of the binder by selecting materials with glass transition temperature below the recording temperature. This allows the binder to remain stable structurally while becoming fluid during recording, preventing medium deformation and enabling heat-assisted recording.
Solution Approach 2:
The patent uses a composite system combining magnetic particles with a specifically selected binder material that has unique thermal properties. This composite structure allows the magnetic layer to withstand recording temperatures while the binder provides both structural support and thermal stability through its phase transition 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
Enables the practical application of heat-assisted recording to particulate magnetic recording media, overcoming the trilemma of high-density recording, thermal stability, and ease of writing by effectively diffusing heat away from the magnetic layer.
Implementation Method 1
a heat-diffusing layer of higher thermal conductivity than the magnetic layer between the nonmagnetic organic material support and the magnetic layer
Data Source
AI summary
The magnetic recording medium is a particulate magnetic recording medium for heat-assisted recording, as well as includes a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic organic material support and a heat-diffusing layer of higher thermal conductivity than the magnetic layer between the nonmagnetic organic material support and the magnetic layer.