Magnetic Head Write Element Substrate Heat Dissipation
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Solution Overview
Problem
Current magnetic disk drives face challenges in maintaining stable recording density due to increased write protrusion caused by higher coercive force magnetic media, leading to fluctuations in clearance during write operations, which affect recording reliability.
Innovation Solution
A magnetic head design where the write element is positioned closer to a substrate capable of dissipating heat, such as an alloy with greater than 50% TiC, to manage heat generated during write operations, thereby suppressing write protrusion and maintaining stable clearance between the air bearing surface and the magnetic medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If higher coercive force magnetic media are used to increase recording density, then storage capacity is improved, but write protrusion increases causing clearance fluctuations
Solution Approach 1:
The harmful heat generated by the write element is extracted and directed away from the air bearing surface by positioning the write element closer to the substrate, allowing heat to be conducted into the substrate rather than causing thermal expansion at the ABS
Solution Approach 2:
The substrate acts as an intermediary heat sink between the write element and the air bearing surface, conducting heat away from critical components to prevent thermal expansion and clearance fluctuations
2Reliability
If write element is positioned closer to substrate for heat dissipation, then write protrusion is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the vertical positioning parameter of the write element relative to the substrate, moving it closer to exploit the substrate's heat dissipation capability while maintaining functional performance
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 design effectively reduces write protrusion by efficiently dissipating heat, enhancing the reliability and stability of magnetic disk drives by maintaining consistent clearance, even under varying write signal conditions.
Implementation Method 1
heat generated by the write element during write operations is dissipated by the substrate
Implementation Method 2
heat produced by the heater element 508 caused by heat produced by the heater element 508 to cause enlargement of an area of the magnetic head 500 at the ABS 514
Implementation Method 3
utilizing thermal expansion of materials near the heater element 508 caused by heat produced by the heater element 508 to cause enlargement of an area of the magnetic head 500 at the ABS 514
Data Source
AI summary
A system includes a magnetic head, a magnetic medium, a drive mechanism for passing the magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head for controlling operation of the magnetic head, wherein the magnetic head has a write element, a read element, a substrate that is an alloy material having greater than about 50 at. % TiC, and a heater element positioned between the read element and the write element, the write element being positioned nearer to the substrate than the read element such that heat generated by the write element during write operations is dissipated by the substrate, and the heater element being adapted for inducing protrusion of portions of an air bearing surface (ABS) of the magnetic head to adjust a clearance between the portions of the ABS and the magnetic medium.