Data Storage Head Element Reverse Biasing Electro-Migration
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Solution Overview
Problem
Data storage devices face challenges in maintaining head element longevity due to electro-migration effects during write operations, which can lead to reduced performance and reliability over time.
Innovation Solution
Applying a reverse bias signal with opposite polarity during non-write modes based on the write interval to counteract electro-migration effects, with adjustable amplitude and duration to balance effectiveness and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a write bias signal is applied to the head element during write operations, then write performance is improved, but electro-migration effects accelerate causing reduced head element longevity
Solution Approach 1:
The patent applies a reverse polarity bias signal to the head element during non-write intervals to counteract the electro-migration effects caused by the write bias signal. This preliminary anti-action prevents the accumulation of damage by applying an opposing electrical stress that migrates atoms in the reverse direction, thereby compensating for the wear caused during write operations and extending head element life.
Solution Approach 2:
The patent implements periodic application of reverse bias signals during non-write intervals between write operations. This periodic action allows the head element to recover from electro-migration damage by applying alternating electrical stress cycles, where the reverse bias during idle periods compensates for the forward bias damage during write periods, maintaining both performance and longevity.
2Reliability
If the reverse bias signal amplitude and duration are increased to better counteract electro-migration, then head element longevity is improved, but energy consumption and potential interference with read operations increase
Solution Approach 1:
The patent applies reverse bias signals at reduced amplitude and/or shortened duration compared to the write bias signals, recognizing that complete compensation is not necessary. By applying partial reverse bias action during non-write intervals, the patent achieves sufficient electro-migration mitigation without the full energy cost of equal-amplitude reverse signaling, optimizing the balance between longevity extension and 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 effectively mitigates electro-migration effects, prolongs the lifespan of head elements, and maintains data storage device performance by applying a reverse bias signal during non-write intervals, thereby extending the device's operational life.
Implementation Method 1
electro-migration effects
Data Source
AI summary
A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.