Microactuator Gold Coating Stainless Steel Suspension
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Solution Overview
Problem
In information storage devices, the integration of microactuators with stainless steel surfaces in suspension assemblies can lead to electrochemical reactions, resulting in insulative oxidation layers that interfere with electrical conduction, especially under hot and humid conditions, causing reduced performance and potential data loss.
Innovation Solution
A suspension assembly design featuring a stainless steel surface with a gold coating, where the microactuator is electrically connected to the gold coating, reducing the likelihood of electrochemical reactions and maintaining effective electrical conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microactuator is electrically connected to a stainless steel surface in a suspension assembly, then electrical conduction is established, but electrochemical reactions form insulative oxidation layers that interfere with electrical conduction
Solution Approach 1:
The patent introduces a gold coating as an intermediary layer between the microactuator electrical connection and the stainless steel surface. This gold layer serves as a mediator that prevents direct electrochemical reactions between the metal components, thereby eliminating oxidation layer formation while maintaining electrical conduction reliability.
Solution Approach 2:
The patent employs a composite structure consisting of a gold coating applied on a stainless steel surface. This composite material approach combines the electrical conductivity and corrosion resistance of gold with the mechanical strength and durability of stainless steel, creating a surface that resists oxidation while ensuring reliable electrical connections for microactuators.
2Adaptability or versatility
If the suspension assembly operates under hot and humid conditions, then the device can function in various environments, but electrochemical reactions are accelerated causing increased oxidation layer formation
Solution Approach 1:
The gold coating acts as a protective intermediary that isolates the stainless steel surface from environmental exposure. This barrier prevents moisture and oxygen from reaching the steel substrate, thereby blocking the electrochemical reaction pathway even under hot and humid conditions, while allowing the suspension assembly to maintain functionality across various environmental conditions.
Solution Approach 2:
The gold coating creates an inert protective environment for the underlying stainless steel surface. By providing a chemically stable, non-reactive barrier, the gold layer effectively shields the metal assembly from harmful environmental interactions, enabling reliable operation in hot and humid conditions without accelerating oxidation.
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
The gold coating minimizes the formation of insulative oxidation layers, ensuring reliable electrical connections and improved performance of microactuators in information storage devices by maintaining the desired response to applied signals.
Implementation Method 1
electrochemical reactions, resulting in insulative oxidation layers that interfere with electrical conduction
Data Source
AI summary
A novel suspension assembly includes a suspension assembly mounting plate, a microactuator mounting structure extending from the suspension assembly mounting plate, a load beam extending from the microactuator mounting structure, and a laminated flexure attached to the load beam. The laminated flexure includes a tongue that has a read head bonding surface. The suspension assembly includes a stainless steel surface having a gold coating, and a piezoelectric microactuator attached to the microactuator mounting structure and electrically connected to the gold coating.