Low Aspect Ratio Slider Air Bearing Design
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Solution Overview
Problem
Current magnetic storage systems face challenges in maintaining fly height stability due to variations in air speed and temperature, and existing manufacturing processes are inefficient and costly, limiting the precision of slider dimensions and air bearing roll stiffness.
Innovation Solution
The development of low-aspect-ratio sliders with a width greater than or equal to their length, featuring specific air-bearing surface designs and cavity structures, enhances roll stiffness and manufacturing efficiency, allowing for better dimensional control and improved areal density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the dimensions of the side pads are increased to achieve a stiffer air bearing, then roll stiffness is improved, but the slider width increases beyond IDEMA standards
Solution Approach 1:
The patent transitions from conventional high-aspect-ratio sliders (length greater than width) to low-aspect-ratio sliders (width greater than or equal to length). This dimensional change allows the slider to achieve adequate roll stiffness through optimized air-bearing surface geometry rather than simply increasing pad dimensions, thereby maintaining compliance with IDEMA standards while improving mechanical stability.
Solution Approach 2:
The patent changes the aspect ratio parameter of the slider from greater than 1 to less than or equal to 1. This parameter change fundamentally alters the geometric relationships between pads and enables new design spaces for achieving roll stiffness through different means, such as optimized cavity structures and air-bearing surface shaping, rather than relying solely on increased pad dimensions.
2Stability of the object's composition
If narrow trailing air-bearing pads are used to minimize fly height variations, then fly height stability is improved, but the slider rolls from side to side degrading minimum fly height sigma
Solution Approach 1:
The patent applies different geometric characteristics to different regions of the air-bearing surface. The trailing pad maintains a narrow width to preserve fly height stability, while the leading pad and side pads are designed with specific cavity structures and geometric features that provide roll stiffness without increasing overall slider width. This localized optimization allows each region to perform its specific function effectively.
Solution Approach 2:
The air-bearing surface is segmented into distinct functional regions: leading pad, trailing pad, and side pads, each with optimized dimensions and geometric features. The trailing pad is kept narrow for fly height stability, while side pads incorporate cavity structures to provide roll stiffness. This segmentation allows independent optimization of each region's contribution to overall slider performance.
3Reliability
If additional etching steps are used to create negative-pressure ABS features, then air bearing performance is improved, but manufacturing efficiency and cost decrease
Solution Approach 1:
The desired air bearing geometric features are formed during the primary fabrication process rather than requiring subsequent etching steps. By incorporating the cavity structures and surface features directly into the slider manufacturing sequence, the patent eliminates additional processing steps, thereby maintaining manufacturing efficiency while achieving the required air bearing performance for improved reliability.
4Manufacturing precision
If precise dimensional control is achieved through traditional machining and lapping, then read/write head alignment is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent replaces traditional mechanical machining and lapping processes with advanced fabrication techniques that enable precise dimensional control through different mechanisms. By using modern manufacturing methods such as selective laser melting and optimized support structure designs, the patent achieves precise alignment of read and write elements without relying on time-consuming mechanical processing steps.
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 low-aspect-ratio sliders achieve improved air bearing roll stiffness and manufacturing efficiency, reducing fly height variance and increasing the yield of magnetic storage devices while maintaining performance and stability.
Implementation Method 1
The slider rides on a cushion or bearing of air created above the surface of the disk as the disk rotates at its operating speed. The slider has an air-bearing surface (ABS) that faces the disk. The ABS is designed to generate an air-bearing force that counteracts a preload bias that pushes the slider toward the disk.
Implementation Method 2
proper suspension loading and by shaping the ABS so that it has desirable aerodynamic characteristics
Data Source
AI summary
Disclosed herein are embodiments of sliders in which the length of the slider is less than or equal to its width. Also disclosed are data storage devices (e.g., hard disk drives) comprising such sliders. The sliders may include one or more air-bearing surface features to compensate for the lower aspect ratio and to meet performance targets (fly height, roll stiffness, etc.). Such features may include, for example, a trailing-edge pad (which may include an efficiency-flattening hole), a first cavity between a first side of the trailing-edge pad and a first side edge, and a non-intersecting second cavity between a second side of the trailing-edge pad and a second side edge. A slider may also or alternatively include a leading pad and, in some embodiments, a particle trapping structure between the leading pad and the slider's leading edge.