Noble Metal-Coated Waveguide Blocker for HAMR Thermal Confinement
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Solution Overview
Problem
Existing heat-assisted magnetic recording (HAMR) technologies face challenges in achieving optimal thermal gradient and area density due to uncoupled optical energy radiating as background, which degrades the thermal spot confinement and reduces data storage density.
Innovation Solution
A noble metal coating is applied on a parabolic waveguide blocker in the near field transducer (NFT) to excite plasmonic effects, enhancing thermal gradient and confining energy, thereby improving thermal spot confinement and data storage density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a waveguide blocker is used to confine optical energy, then thermal spot confinement is improved, but uncoupled optical energy radiates as background that degrades thermal gradient
Solution Approach 1:
The patent applies a noble metal coating to the waveguide blocker to convert the harmful background radiation into beneficial surface plasmon resonance effects. The noble metal surface supports surface plasmons that couple to the optical energy, transforming the uncoupled radiation into confined plasmonic modes that enhance thermal gradient rather than degrading it.
Solution Approach 2:
The patent changes the optical parameters of the waveguide blocker by introducing a noble metal coating with specific optical properties. The coating thickness and material composition are optimized to modify the plasmonic resonance conditions, thereby controlling the coupling between guided modes and surface plasmons to eliminate harmful background radiation.
2Quantity of substance
If optical energy is confined to a small spot size, then data storage density is increased, but thermal gradient is degraded by background radiation
Solution Approach 1:
The noble metal coating converts the harmful background radiation from uncoupled optical energy into beneficial surface plasmon resonance effects. These plasmons are confined to the noble metal surface and do not radiate as background, thereby maintaining both small spot size for high density and sharp thermal gradient for reliable writing.
3Temperature
If a noble metal coating is applied to the waveguide blocker, then plasmonic effects are enhanced for thermal gradient improvement, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the noble metal coating parameters including thickness (typically 1-10 nm), material composition (Au, Ag, Cu, or their alloys), and spatial distribution to achieve the desired plasmonic effects. By carefully controlling these parameters, the manufacturing process becomes more manageable while still achieving the thermal gradient improvement.
Solution Approach 2:
The noble metal coating is applied selectively to specific regions of the waveguide blocker where plasmonic effects are most needed, rather than uniformly across the entire structure. This localized approach reduces the amount of noble metal material required and simplifies the manufacturing process while maintaining effective thermal gradient enhancement.
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 noble metal coating on the parabolic waveguide blocker suppresses background electromagnetic radiation, leading to improved thermal gradient and increased area density capacity of the HAMR head.
Implementation Method 1
a noble metal coating (e.g., Au, Rh, Ir, Pt, Aluminum (Al), and their alloy such as AuIr, RhIr, etc.) which can enable a plasmonic effect on the PWB surface for HAMR thermal gradient improvement
Implementation Method 2
plasmonic structures, also called near field transducers (NFT), can be used to deliver the desired confinement of the optical heating
Implementation Method 3
heat-assisted magnetic recording (HAMR) can convert optical power into localized heating in a magnetic recording medium to temporarily reduce the switching field needed to align the magnetizations of the medium grains
Data Source
AI summary
The present embodiments relate to a noble metal coating on a parabolic waveguide blocker surface to future improve thermal gradient for HAMR head which can provide an improved thermal spot confinement over other designs. More particularly, the present embodiments relate to a component in the near field transducer (NFT), made of a metallic parabolic shaped waveguide blocker (PWB) with noble metal coating on the PWB surface. The designs as described herein can include a noble metal coating (e.g., Au, Rh, Ir, Pt, Aluminum (Al), etc.) which can enable a plasmonic effect on the PWB surface for HAMR thermal gradient improvement.