New Storage Device Created
15 July 2008Presently any electronic device store information on two-bit value i.e. 0 and , researchers at University of Pennsylvania have created a device that is capable to store values in three digits 0, 1 and 2. This new nanowire based storage device will increase the storage capacity significantly.
Ritesh Aggarwal, the principal researcher, an associate professor at University of Pennsylvania School of Engineering and Applied Science expect that few nanowires will be enough to create electronic devices having enormous amount of storage capacity. The new non-binary nanowire based have a coaxial structure having two phase-change materials. The core is Germanium, antimony and tellurium and cylindrical cell is made of germanium telluride.
Pulse electric field is applied to the whole device and the electric field convert the crystalline structure of core to amorphous and thus in both the crystalline and amorphous conditions, the resistance of the device alters. If both the core and shell are crystalline, the device will offer low resistance and if both are amorphous, it will offer high resistance and these two resistances will represent two bits.
There will also be an intermediate resistance if one of the two is crystalline and other is amorphous. So, this state of resistance will act as the third bit of the device. The device can be made defect free by fabricating nanowire from bottom-up approach and fine-tuning the various characteristics such as diameter, size and other critical properties of the nanowire.
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Interesting technique. I wonder how stable the storage is over time, especially at room temperature. Also, one reason for storing only two states in current technologies is noise resistance: with only two states to detect, you have a huge margin of error, which means the circuitry can be faster because it can be a little less precise. (For instance, you don’t have to give the state time to completely settle on a 1 or 0 before reading it as long as you read it while it’s close enough.) Hopefully this tri-state technology exhibits distinct enough states that noise won’t be an issue.
By the way, I suspect above where you wrote “bits” you meant “states”. A device with three bits (three binary digits) could store the numbers 0 through 7.