MAMR Head Assisting Amount Control for Heat-Induced Degradation
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Solution Overview
Problem
Magnetic recording/reproducing devices face element degradation due to continuous heat generation from bias voltage, leading to shorter lifetimes and increased risk of dust generation, especially on recording surfaces with high recording capacity, which affects the overall device longevity.
Innovation Solution
An assisted magnetic recording/reproducing device with an assisting amount control part adjusts the assisting amount of each magnetic head based on the recording capacity of each surface, calculating an initial value and adjusting the write time ratio to balance the load on each head, thereby reducing heat and prolonging device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bias voltage applied to MAMR elements is increased to increase recording density, then the recording capacity increases, but the element degradation accelerates due to continuous heat generation
Solution Approach 1:
The patent applies dynamics by making the bias voltage adjustable rather than fixed. The assisting amount control part dynamically changes the bias voltage applied to MAMR elements based on operating conditions, allowing the system to optimize between recording density and element lifetime by reducing voltage when high density is not required.
Solution Approach 2:
The patent changes the electrical parameter (bias voltage) of the MAMR elements to control the assisting amount. By adjusting this parameter, the system can vary the recording density and heat generation level, thereby resolving the contradiction between high recording capacity and element degradation.
2Productivity
If the recording capacity of each recording surface is increased, then the write time becomes longer, but the device degradation progresses faster due to increased heat application
Solution Approach 1:
The system dynamically adjusts the bias voltage based on the recording capacity requirements of different surfaces. When a surface requires high recording capacity, the voltage is increased accordingly, but can be reduced when lower capacity suffices, thereby managing heat accumulation and preventing device degradation.
Solution Approach 2:
The patent modifies the electrical parameter (bias voltage) in response to varying recording capacity demands across different magnetic recording surfaces, allowing optimized performance while controlling thermal effects that lead to device degradation.
3Productivity
If multiple magnetic heads are used to increase device capacity, then the total recording capacity increases, but the risk of dust generation increases when one head deteriorates
Solution Approach 1:
The patent applies dynamics by enabling individual control of bias voltage for each magnetic head through the assisting amount control part. This allows the system to adjust each head's operating conditions independently, extending their lifetime and reducing the risk of deterioration-induced dust generation while maintaining high device capacity.
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 extends the lifetime of magnetic heads and the entire device by evenly distributing the load across recording surfaces, reducing degradation and maintaining balanced usage of each head, thus preventing premature deterioration.
Implementation Method 1
the continuous heat generated by the current applied to the MAMR element would cause element degradation
Implementation Method 2
the more heat is applied, and in accordance with the Arrhenius' law, the device degradation is more likely to progress
Data Source
AI summary
According to one embodiment, a magnetic recording/reproducing device includes a plurality of magnetic recording medium each including a recording surface, a plurality of assisted magnetic recording heads each provided with the recording surface in order to perform assisted recording, and an assisting amount adjustment part connected to the assisted magnetic recording heads in order to adjust an assisting amount of each assisted magnetic recording head corresponding to a recording capacity of the recording surface.