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RESET distribution of phase-change random access memory (PRAM) is highly related to heat fluctuations during RESET write (RESETW). In this work we investigate the effect of load resistance (RL) with constant voltage write method and propose new RESETW method with an optimal RL selection equation with considering Joule heating and thermoelectric effects. Since the optimal RL compensates for intrinsic...
Research on phase-change random access memory (PRAM) for multilevel cells (MLCs) has been actively conducted owing to the advantages of PRAM cells, such as large resistance margin and fast read/write access time. However, the resistance drift (R-drift), which increases the resistance of the PRAM cells with time, should be overcome to achieve MLC PRAM operation. In this paper, we introduce sensing...
Since the discovery of a theoretical idea of spin-transfer torque (STT) [1], STT-MRAM has attracted a great interest as a candidate of universal memory.
4F2 selector-less crossbar array 2Mb ReRAM test chip with 54nm technology has been successfully integrated for high cell efficiency and high density memory applications by implementing parts of decoders to row/column lines directly under the cell area. Read/write specifications for memory operation in a chip are presented by minimizing sneak current through unselected cells. The characteristics of...
We have extracted the exact position (xT and yT) and energy of a trap in tunnel oxide which induces RTN by considering the channel resistances of pass cells in floating gate NAND flash memory string. Moreover, the trap position (zT) along the channel width direction was also extracted by using an interference between adjacent bit-lines.
We report the hydrogen sensing properties of a sensor using TiO2 nanotube arrays. The TiO2 nanotube arrays were fabricated by anodization on titanium foil, in an electrolyte containing 0.5 wt% hydrofluoric acid mixed with water, the electric potential being 15V. TiO2 nanotube arrays were annealed at 600 Celsius for 1 h. The sensors were equipped with platinum electrodes. These two were connected with...
This paper reports a method to fabricate a 100 nm scale heater-thermometer into a silicon microcantilever based on contact photolithography and a controlled annealing process. The heater is formed during a photolithography process that can achieve a minimum feature size of about 1 mum, while careful control of doping and annealing parameters allows the heater size to be further decreased, to a width...
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