Near Field Transducer Laser Annealing for Material Stability
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Solution Overview
Problem
Conventional thin film deposition techniques often result in metastable microstructures and material instability in semiconductor and electronic devices, particularly due to limitations in heat treatment and dopant alloying in thin film systems, which can lead to undesirable material properties and physical changes over time.
Innovation Solution
The use of liquid phase epitaxy (LPE) combined with laser annealing to form near field transducers (NFTs), where plasmonic material is deposited and laser annealed to induce epitaxial modification, controlling grain growth and microstructure for enhanced stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional thin film deposition techniques are used, then material can be deposited on substrate, but metastable microstructures and material instability occur
Solution Approach 1:
The patent employs laser annealing to induce phase transition in the deposited plasmonic material, transforming it from a metastable amorphous or polycrystalline state to a stable single-crystal structure through controlled melting and solidification, thereby resolving the material stability issue
Solution Approach 2:
The patent replaces conventional thermal annealing (mechanical/thermal system) with laser annealing (optical system) to achieve epitaxial growth and microstructure control, enabling precise control over phase transitions and crystal orientation without the limitations of traditional heat treatment
2Reliability
If laser annealing is used to induce liquid phase epitaxy, then single grain plasmonic materials are formed with improved properties, but process complexity increases
Solution Approach 1:
The patent utilizes precise control of laser parameters (wavelength, pulse duration, energy density, scanning speed) to achieve the desired liquid phase epitaxy and single-crystal formation, transforming a complex process into a controllable parameter-driven process that can be integrated into existing fabrication workflows
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 approach allows for the creation of NFTs with single grain plasmonic materials, providing improved thermal conductivity, strength, and electron scattering rates, while minimizing grain boundaries and enhancing material density, thus reducing thermally-driven failure modes and stabilizing the microstructure.
Implementation Method 1
laser annealing at least a portion of the deposited plasmonic material to induce liquid phase epitaxy
Implementation Method 2
induce liquid phase epitaxy (LPE) in the annealed deposited plasmonic material
Implementation Method 3
providing improved thermal conductivity
Data Source
AI summary
Methods of forming a near field transducer (NFT), the methods including the steps of depositing plasmonic material on a substrate; laser annealing at least a portion of the deposited plasmonic material at a wavelength from 100 nm to 2.0 micrometers (μm) to induce liquid phase epitaxy (LPE) in the annealed deposited plasmonic material to form a epitaxially modified plasmonic material; and forming a NFT from at least a portion of the epitaxially modified plasmonic material are disclosed as well as other methods and devices such as those formed.