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Nano-pulsed laser irradiation scanning system for phase-change materials
Sookyung Kim1, Xue Zhe Li, Sangbin Lee
1Nanostorage Inc., EMC Building #606, Sangam-Dong, Mapo-Ku, Seoul 120-090, Republic of Korea.
Ultramicroscopy
|June 20, 2008
Summary
A new nano-pulsed laser irradiation system, built using a DVD pickup, precisely analyzes phase-change materials for memory devices. This system quantifies optical properties and writing performance, aiding in advanced material characterization.
Area of Science:
- Materials Science
- Optical Engineering
- Nanotechnology
Background:
- Increasing demand for phase-change random access memory (PRAM) and optical storage media necessitates advanced characterization tools.
- Existing methods may lack the precision required for analyzing novel phase-change materials.
Purpose of the Study:
- To develop a versatile nano-pulsed laser irradiation system for characterizing phase-change materials.
- To enable precise analysis of optical properties and writing performance for PRAM and optical storage applications.
Main Methods:
- Utilized a commercially available digital versatile disk (DVD) optical pick-up for system development.
- Implemented precise focusing and scanning using the DVD pick-up's auto-focusing and voice coil motor (VCM).
- Integrated adjustable laser power, pulse duration, recording patterns, and in situ reflectivity measurements.
Main Results:
- The system successfully performed various writing and reading functions, including phase transition analysis.
- Measurements of power time effect (PTE) diagrams and reflectivity maps were conducted on Ge(2)Sb(2)Te(5) samples.
- Demonstrated the system's capability to quantify optical characteristics of phase-change materials.
Conclusions:
- The developed nano-pulsed laser irradiation system is a powerful tool for quantifying optical characteristics of phase-change materials.
- The system's precision and versatility support the development of advanced PRAM and optical storage technologies.
