Metallic Interlayer for HAMR Peg Adhesion and Thermal Stability
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Solution Overview
Problem
Heat assisted magnetic recording (HAMR) devices face issues with peg deformation and recession due to poor adhesion between the peg and the head overcoat, leading to defects and failure at high operating temperatures.
Innovation Solution
Incorporating a metallic layer between the peg and the head overcoat to enhance adhesion, using materials like iridium, chromium, platinum, and their alloys, which provide improved thermal stability and resistance to oxidation and corrosion, thereby reducing peg deformation and increasing the reliability of the HAMR head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no metallic layer is used between the peg and overcoat, then the device structure is simpler, but the peg adhesion is poor leading to deformation and recession at high temperatures
Solution Approach 1:
A metallic layer is introduced as an intermediary between the peg and the overcoat. This intermediate layer provides improved adhesion and thermal stability, preventing peg deformation and recession at high operating temperatures without significantly complicating the overall device structure.
Solution Approach 2:
The patent employs composite material structures by combining the peg material with a metallic layer that has superior thermal and adhesive properties. This composite approach leverages the strengths of different materials to achieve both structural integrity and thermal resistance.
2Stability of the object's composition
If a metallic layer is added to improve thermal stability, then the peg deformation is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The metallic layer is applied in advance during the manufacturing process, before the device undergoes high-temperature operation. This preliminary application of the protective layer ensures thermal stability is built into the structure from the outset, preventing deformation before it can occur during service.
3Temperature
If the peg is exposed directly to high temperatures, then the device operates at required temperatures, but the peg recession and failure occur
Solution Approach 1:
The metallic layer serves as a protective intermediary that shields the peg from direct exposure to harsh high-temperature environments. It allows the device to operate at required temperatures while the metallic layer absorbs the thermal stress and prevents peg degradation.
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 metallic layer significantly increases the thermal stability and reliability of the HAMR head by preventing peg recession and maintaining structural integrity at high temperatures, as demonstrated by increased lifetimes and reduced failure rates in annealing tests.
Implementation Method 1
the metallic layer including iridium (Ir), rhodium (Rh), ruthenium (Ru), radium (Ra), platinum (Pt), palladium (Pd), rhenium (Re), chromium (Cr), niobium (Nb), nickel (Ni), lead (Pb), silicon (Si), tin (Sn), aluminum (Al), tungsten (W), molybdenum (Mo), hafnium (Hf), titanium (Ti), zirconium (Zr), yttrium (Y), or combinations thereof
Data Source
AI summary
Devices having an air bearing surface (ABS), the devices include a write pole; a near field transducer (NFT) including a peg and a disc, wherein the peg is at the ABS of the device; an overcoat, the overcoat including a low surface energy layer.