Laser Modulation for Magnetic Recording Head Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic recording systems face challenges in achieving precise control over head-media separation and efficient data storage due to limitations in focusing optical energy and exciting air bearing resonant modes, which affect data density and recording performance.
Innovation Solution
The use of a laser arrangement to induce heat-induced modulation of a transducer slider, leveraging modulated laser light to heat the magnetic medium and reduce coercivity, allowing for precise control of head-media separation and data recording, while also utilizing air bearing resonant modes for efficient energy transfer and high signal-to-noise ratio measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical energy focusing methods are used for magnetic recording, then data storage is achieved, but precise control over head-media separation and recording performance is limited
Solution Approach 1:
The patent applies mechanical vibration by modulating the laser light at resonant frequencies of the air bearing, causing the transducer to vibrate and protrude toward the media at controlled frequencies. This resonance-based approach enables precise control of head-media separation and significantly improves recording performance by operating at frequencies inaccessible with conventional static methods.
Solution Approach 2:
The patent changes the operational parameters by using modulated laser light frequency and amplitude to dynamically control the thermal expansion of the transducer. By varying the laser modulation frequency to match air bearing resonant modes, the system achieves precise control over head-media separation and recording performance that was previously unattainable with conventional fixed-parameter methods.
2Reliability
If laser power is increased to write or erase data, then data recording capability is achieved, but energy consumption increases
Solution Approach 1:
The patent employs periodic action by modulating the laser light in synchronization with the air bearing resonant frequency. This periodic modulation creates oscillating thermal expansion that drives the transducer toward and away from the media in a controlled cycle, enabling data recording with lower average power consumption compared to continuous high-power laser application.
Solution Approach 2:
The patent utilizes phase transitions in the thermal expansion response of the transducer material. By modulating the laser at resonant frequencies, the system exploits the phase relationship between thermal input and mechanical response to achieve maximum protrusion amplitude with minimum energy input, improving recording capability while reducing overall energy consumption.
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 enables faster and more efficient data recording with higher signal-to-noise ratios, allowing for precise control of head-media separation and data density, and operates at frequencies inaccessible with conventional methods, maintaining low input energy requirements.
Implementation Method 1
heat a region of a magnetic medium in proximity to the slider and produce modulated laser light to cause heat-induced modulation of the slider
Implementation Method 2
couple laser light at a power that reduces a coercivity of magnetic material at the region for writing data to or erasing data at the region
Implementation Method 3
produce modulated laser light to cause heat-induced modulation of the slider
Implementation Method 4
utilizing air bearing resonant modes for efficient energy transfer and high signal-to-noise ratio measurements
Data Source
AI summary
A transducer comprises a slider and a laser arrangement. The laser arrangement is configured to heat a region of a magnetic medium in proximity to the slider and produce modulated laser light to cause heat-induced modulation of the slider. The laser arrangement is configured to couple laser light at a power that reduces a coercivity of magnetic material at the region for writing data to or erasing data at the region, and couple modulated laser light to cause heat-induced modulation of the slider at a power lower than the power for writing data to or erasing data at the magnetic medium.