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At left, pulses are supplied to the device under test from an arbitrary waveform generator, while an oscilloscope measures device voltage and current independently. At right, a scanning electron microscopy image of the fabricated bridge device shows a narrow line of phase change material bridging two planarized TiN contacts separated by insulating . The inset shows the active device volume, located above the narrow dielectric gap between the two electrodes (Ref. 14).
(a) Initial resistance vs device length, (b) threshold voltage vs resistance, and (c) threshold voltage vs device length for amorphous GeSb devices tested from the amorphous-as-deposited state, with bridge widths of 40 nm (squares) and 140 nm (circles).
Threshold voltage vs device length, for four amorphous-as-deposited phase change materials. The slopes of the linear fits are used to determine the threshold fields for each material, as shown in Table I. Different symbols indicate different bridge widths.
Critical fields for threshold switching calculated from slopes of data shown in Fig. 3.
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