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Three expanded graphites, EG1, EG2 and EG3 that were prepared by rapid heating expandable graphite to 600, 800 and 1000°C, respectively, were ball-milled in a high-energy mill (planetary-type) in an air atmosphere with 16.7% iron powder addition. The X-ray diffraction patterns of the products show that the amorphization process of the powder EG-Fe mixtures during ball-milling is accelerated with increasing...
In this work, a physics-based analytical model for the partial-RESET operation in Phase Change Memories is proposed. The model describes the electro-thermal behavior of the memory cell and gives an insight into the dynamical phenomena involved in the amorphization process inside the chalcogenide layer. Simulations are compared to measurements carried out on a 180-nm PCM experimental chip based on...
In phase change memories, the crystalline to amorphous phase transition is strongly affected by the cell geometry. In this paper, we study the amorphization process by analyzing the effects of amorphizing (RESET) pulses on the phase distribution inside the active chalcogenide portion of the memory cell. The purpose is to investigate how the shape and the volume of the amorphous cap are affected by...
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