Heat-Assisted Magnetic Recording Light Quantity Optimization
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Solution Overview
Problem
Magnetic recording devices face challenges in optimizing light quantity for heat-assisted recording, leading to insufficient data recording area and potential magnetic interference, as existing techniques lack effective light quantity optimization methods for heat-assisted recording.
Innovation Solution
A magnetic recording device configuration that includes a light output module, a write head, a light quantity setting module, and a heat-assisted recording controller, which performs light quantity optimization processing before information recording to efficiently use the recording area by adjusting the light quantity on the same track during multiple rotations, ensuring data is recorded without damaging servo information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light quantity optimization processing is performed in an independent recording area separate from data recording area, then light quantity can be optimized for heat-assisted recording, but the data recording area becomes insufficient
Solution Approach 1:
The patent merges the light quantity optimization processing with the data recording area by performing optimization on the same track during multiple rotations. The controller executes optimization processing in a first rotation and data recording in subsequent rotations on the same track, eliminating the need for separate optimization areas and maximizing usable recording space.
Solution Approach 2:
The patent performs light quantity optimization processing as a preliminary action before data recording on the same track. The controller optimizes the light quantity by writing test patterns and measuring reflected light intensity in the first rotation, then uses this optimized light quantity for actual data recording in subsequent rotations, ensuring both optimization and data storage occur in the same area.
2Reliability
If high coercive force material is used in recording film to prevent magnetic interference, then magnetic stability is improved, but the coercive force at ordinary temperature becomes too high for direct magnetic recording
Solution Approach 1:
The patent changes the temperature parameter of the recording film temporarily during the recording process. By applying optical heat assistance, the recording position's temperature is increased, which reduces the coercive force of the high-coercive-force material at elevated temperatures, enabling magnetic recording to proceed successfully while maintaining high magnetic stability at ordinary temperatures.
Solution Approach 2:
The patent introduces optical heat assistance as an intermediary mechanism between the recording head and the high-coercive-force recording film. The light-emitting element applies optical energy that converts to thermal energy, creating a temporary thermal field that mediates the recording process by reducing coercive force only at the recording position and during the recording interval, without affecting the overall magnetic stability of the medium.
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 approach allows for more efficient use of the recording area, enabling higher information density on magnetic disks by optimizing light quantity for heat-assisted recording, thereby preventing magnetic interference and ensuring accurate data storage.
Implementation Method 1
a technique has been developed that makes it possible to lower the coercive force at a recording position by increasing the temperature of the recording position with optical heat assistance
Implementation Method 2
increasing the temperature of the recording position with optical heat assistance
Implementation Method 3
record magnetically the information
Data Source
AI summary
According to one embodiment, a magnetic recording device includes: a magnetic recording medium provided with data regions for data recording; a light output module which outputs an optical signal to be applied to a recording position where recording data is recorded of the data regions; a write head which records the recoding data at the recording position magnetically; a light quantity setting module which sets a light quantity value of the optical signal output from the light output module; a heat-assisted recording controller which performs a control so that the recording data is recorded by the write head at the recording position which is heat-assisted by applying an optical signal with the set light quantity value; and a controller which adjusts the light quantity value of the optical signal set by the light quantity setting module using the recording position being a part of the data regions.