Crystallization studies on phase-change optical recording media by use of a two-dimensional periodic mark array

Xiaodong Xun, James K. Erwin, Warren Bletscher, Jinhan Choi, Senta Kallenbach, Masud Mansuripur

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We present the results of crystallization studies in thin-film samples of amorphous and crystalline GexSbyTez. The experiments, conducted at moderately elevated temperatures, are based on measurements of the first-order diffraction efficiency from a two-dimensional periodic array of recorded marks. When the samples are slowly heated above room temperature, changes in the efficiencies of various diffracted orders give information about the on-going crystallization process within the sample. Two different compositions of the GeSbTe alloy are used in these experiments. Measurements on Ge2Sb2.3Te5 films show crystallization dominated by nucleation. For the Sb-rich eutectic composition Ge-(SbTe), crystallization is found to be dominated by growth from crystalline boundaries. We also show that crystalline marks written by relatively high-power laser pulses are different in their optical properties from the regions crystallized by slow heating of the sample to moderate temperatures.

Original languageEnglish (US)
Pages (from-to)6535-6547
Number of pages13
JournalApplied Optics
Issue number35
Publication statusPublished - Dec 10 2001


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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