The Ag-In-Sb-Te system is widely used for phase-change discs such as compact disc rewritable (CD-RW) and rewritable digital versatile disc (DVD+RW). To clarify the effect of Ag and In in the Ag-In-Sb-Te system, we studied the local structure of Ag-In-Sb-Te phase-change material by extended X-ray absorption fine structure (EXAFS). The results suggest that the existence of Ag contributes to the thermal stability of amorphous marks and existence of In contributes to high-speed phase-change.

Articles you may be interested inEvidence of localized surface plasmon enhanced magneto-optical effect in nanodisk array Appl. Phys. Lett. 96, 081915 (2010); 10.1063/1.3334726Magneto-optical spectroscopy study of the solid-state reaction in Ti/Ni multilayered films Magnetooptical Faraday effect of porous films comprised of cobaltsubstituted barium ferrite fine particles dispersed in a resinWe have studied Faraday rotation and magnetic properties of Co-Ti substituted barium ferrite films with perpendicular anisotropy, which were prepared by targets-facing-type sputtering method on ( 111) oriented GGG substrates. Faraday rotation «(J F) of 500-830 nm was measured by using the Faraday modulation method. It was found that fiF increased proportionally to the content of cobalt in the wavelength range 700-830 nm. In the BaFe lO .42 CO O . 78 Ti o . s 0 19 fi1m, Faraday rotation and magnetic properties were as fonows: OF = 0.75 deg/pm at 780 nm, anisotropy field: Hk = 5.2 kOe, coercive force: He = 800 Oe, Curie temperature: Tc = 380 ·C. Thermomagnetic recording was achieved on this film by using a 780-nm laser diode. As a result, 2.0-pm bit patterns were observed by Faraday effect.

We investigated Sb-based In-Sb as a material for high-speed recording that is capable of maintaining a highly stable amorphous phase. The crystalline phase of In-Sb is unstable at approximately its eutectic composition. After an aging test, InSb was segregated, and its reflectivity was reduced. For an Sb-rich In-Sb, we confirmed that its crystalline phase is stable and its crystallization speed is high. We demonstrated the feasibility of 16× digital versatile disk (DVD) recording using 2T-period multiple-pulse strategy.

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