Suspension Ground Layer for Microwave Signal Transmission
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Solution Overview
Problem
In magnetic disk devices, the reduction in magnetic particle size for higher recording density leads to magnetization disappearance due to heat fluctuations, requiring increased magnetic anisotropy energy, which in turn necessitates a strong recording magnetic field. However, the intensity of magnetic fields generated by recording head elements is restricted, making high-density recording difficult, especially with significant impedance mismatch issues in microwave signal transmission lines that cause substantial transmission loss.
Innovation Solution
A suspension configuration with a flexure supporting both microwave and recording signal transmission lines, where the microwave signal transmission line is supported by a separate lamination structure with a conductive ground layer and insulating layer, reducing impedance mismatch and transmission loss while minimizing the weight and rigidity of the arm part to maintain gimbal function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the microwave signal transmission line is supported by a separate insulating layer structure, then the weight and rigidity of the arm part are reduced, but significant impedance mismatch occurs causing large transmission loss
Solution Approach 1:
The patent applies composite materials by combining a conductive ground layer with an insulating layer to form a separate support part. This composite structure provides both mechanical support functions and electromagnetic ground functions, reducing impedance mismatch while maintaining reduced weight and rigidity benefits for gimbal performance.
2Ease of operation
If a separate support part formed of insulating layer is provided to support the microwave signal transmission line, then the weight and rigidity of the arm part are reduced, but significant impedance mismatch occurs at the separate support part
Solution Approach 1:
The separate support part is constructed as a composite structure with both conductive and insulating layers. The insulating layer provides mechanical support while the conductive ground layer ensures proper electromagnetic grounding, together achieving both gimbal function and signal transmission reliability.
3Device complexity
If no ground layer is provided in the separate support part, then the structure is simpler and weight is reduced, but impedance mismatch causes substantial transmission loss
Solution Approach 1:
The patent introduces a ground layer in the separate support part, creating a composite structure that combines conductive and insulating materials. This resolves the contradiction by adding necessary electromagnetic functionality without excessive complexity, as the ground layer is integrated into the existing separate support part design.
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 proposed suspension design effectively reduces microwave signal transmission loss and suppresses the effects on gimbal function, enabling efficient high-frequency magnetic field generation and recording while maintaining the stability of the magnetic head slider.
Implementation Method 1
a first ground layer that is conductive and a first insulating layer that supports the microwave signal transmission line are laminated
Data Source
AI summary
A suspension is configured to support a magnetic head slider having a recording head element for recording to a magnetic recording medium and a microwave generating element that applies a high-frequency magnetic field to the magnetic recording medium when recording is conducted by the recording head element. The suspension has a flexure that supports the magnetic head slider, a microwave signal transmission line and a recording signal transmission line. The microwave signal transmission line is connected to the microwave generating element and configured to transmit microwave signals for generating the high-frequency magnetic field. The microwave signal transmission line and the recording signal transmission line are supported between the main body part and the support part, a portion of which has a first lamination structure where a first ground layer is conductive and a first insulating layer supports the microwave signal transmission.