Understanding the electrothermal processes involved in probe storage on phase-change media
Wright, C. David
Aziz, Mustafa M.
University of Exeter
Proceedings of SPIE
We have investigated the feasibility of a probe storage technique based on the interaction of a conductive tip with a phase-change (PC) medium. The electro-thermal writing process was modeled using the element method. The crystalline and the amorphous phases were taken into account as a possible initial state of the phase-change material. The analysis of the corresponding current flow and temperature distributions showed that the choice of the initial state of the PC material greatly influences the shape of the written dots, due to the important difference in the electrical properties of these two states. When introducing the kinetics of the phase-change process in the model, the simuation results indicated indeed, that the crystalline dots spread throught the thickness of the PC layer, whereas the amorphous dots are more localized at the top of the layer. One can then expect important effects on the readout process (and contrast) and the erasing mechanism, depending on the initial state of the storage medium.
Copyright © 2003 Society of Photo-Optical Instrumentation Engineers. This paper was published in Proceedings of SPIE Volume 5069, pp. 150-157 and is made available with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Vol. 5069, pp. 150-157