HAMR Magnetic Recording Housing With Low-Dew-Point Atmosphere
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Solution Overview
Problem
Magnetic recording devices using heat-assisted magnetic recording (HAMR) face degradation issues due to moisture, leading to corrosion of the magnetic head and decomposition of the lubricant in the recording medium, exacerbated by high-temperature regions created during recording.
Innovation Solution
The magnetic recording device is designed with a housing that maintains an internal dew point of 5° C. or less, using a moisture absorbent like zeolite and inert gases, and includes a controller to monitor and adjust moisture levels, ensuring the dew point remains below 5° C. to prevent corrosion and decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat-assisted magnetic recording is used to increase recording capacity, then recording density is improved, but moisture causes corrosion of the magnetic head and decomposition of lubricant at high temperatures
Solution Approach 1:
The patent applies inert atmosphere by sealing the magnetic recording device in a hermetic package and filling it with inert gas (nitrogen or dry air) to create a moisture-free environment. This prevents moisture from causing head corrosion and lubricant decomposition during HAMR operation, while maintaining high recording capacity through laser heating to Curie temperature.
Solution Approach 2:
The patent implements preliminary action by pre-drying the magnetic recording device components before assembly and maintaining the internal dew point at -40°C or lower through desiccants and hermetic sealing. This preliminary moisture removal prevents degradation issues during subsequent HAMR operations, ensuring both high recording capacity and head reliability.
2Productivity
If high-temperature regions are created during HAMR recording, then recording capacity increases, but lubricant decomposition and acid generation occur
Solution Approach 1:
The patent uses inert atmosphere by sealing the device and filling with dry inert gas to prevent moisture from accelerating lubricant decomposition during high-temperature HAMR recording. The inert environment suppresses chemical reactions that would otherwise occur at elevated temperatures, maintaining both recording capacity and lubricant integrity.
Solution Approach 2:
The patent converts the potential harm of high-temperature operation into benefit by using the heat necessary for HAMR recording while simultaneously employing inert atmosphere and low dew point control to prevent the harmful side effects (lubricant decomposition). The controlled environment transforms a harmful thermal condition into a beneficial recording mechanism without degradation.
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 effectively suppresses the deterioration of the magnetic head and recording medium, maintaining device performance over a specified period by controlling moisture levels, thereby preventing corrosion and thermal decomposition.
Implementation Method 1
a moisture absorbent such as zeolite is disposed in the housing
Data Source
AI summary
According to one embodiment, a magnetic recording device includes a housing having an internal dew point of 5° C. or less, a disk-shaped recording medium provided inside the housing, and a magnetic head provided inside the housing and performing information processing with respect to the recording medium.