Featured Research

from universities, journals, and other organizations

Stacked, Packed Nanowires Hold Triplexed Megadata

Date:
April 23, 2004
Source:
University Of Southern California
Summary:
A novel transistor architecture using molecular-scale nanowire memory cells holds the promise of unprecedently compact data storage.

Memory on a nanowire: Simulation of memory cells holding 3 bits of data each formed spontaneously on an indium oxide nanowire by a process created at the USC Viterbi School of Engineering and the NASA Ames Research Center.
Credit: Image courtesy University Of Southern California

A novel transistor architecture using molecular-scale nanowire memory cells holds the promise of unprecedently compact data storage.

Related Articles


Researchers at the University of Southern California and the NASA Ames Research Center have successfully tested a self-assembled molecular memory device they say has the potential of holding 40 Gigabits per square centimeter -- a far greater density than any achieved on silicon.

Furthermore, says Chongwu Zhou, an assistant professor in the USC Viterbi School department of electrical engineering, because of the self-assembly feature, such ultra dense memory devices can likely be cheaper than the silicon flash memories now widely used in digital cameras, "memory sticks" and other applications.

According to a recent paper by Zhou and his group in Applied Physics Letters describing the technology, the density is achieved by the nanoscale (one millionth of a millimeter) size of the building blocks used,

( Ten nanometers is 0.0000004 inch; an average bacterium is about 1000 nanometers long; the smallest known virus about 20 nanometers long).

The USC/Ames system is still more compact because each memory cell can hold not just one bit of data but three, by virtue of having 8 separate, stable identifiable electronic states.

The USC/Ames system is already quite stable, holding information up to 600 hours. "We believe further work can increase the stability still further," the scientist said.

The USC/Ames researchers synthesized nanowires of indium oxide (In2O3) 10 nanometers in diameter and about 2000 nanometers long, by a "laser ablation" process that first vaporizes an indium containing compound, and then precipitates the indium out in a catalyzed process in which the wires form spontaneously as the indium reacts with ambient oxygen.

The researchers then placed the nanowires on a thin layer of quartz, and activated them by simply submerging them in a solutions of redox materials — various were tested — which self-assembled a layer of coating onto the wires, creating transistors.

The resulting transistors could be placed not in one activated state, but three distinct ones, by using different voltages to stimulate them. "We repeated tens of cycles for the endurance test for each memory operation and found that all the levels were distinguishable in the tested cycles," the authors wrote in their APL paper.

In the same paper, they also noted that the assembly process — a cold one — "represents a significant departure from the channel hot electron injection commonly used for silicon flash memory," The paper claims that the USC/Ames process requires lower power and is inherently less likely to introduce defects that can cause errors in the device.

The team included, besides Zhou, USC Viterbi School of Engineering graduate students Chao Li, Bo Lei, Daihua Zhang, Son Han, Tao Tang, Xialei Lu, and Zuqin Liu; and Wendy Fan, Sylvia Asano, Jie Han, and Meyya Meyyappan of Ames. Fan, Asano, and Han's contributions were underwritten by the Eloret Corporation, a Sunnyvale CA consulting firm working under contract to NASA.


Story Source:

The above story is based on materials provided by University Of Southern California. Note: Materials may be edited for content and length.


Cite This Page:

University Of Southern California. "Stacked, Packed Nanowires Hold Triplexed Megadata." ScienceDaily. ScienceDaily, 23 April 2004. <www.sciencedaily.com/releases/2004/04/040421234637.htm>.
University Of Southern California. (2004, April 23). Stacked, Packed Nanowires Hold Triplexed Megadata. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2004/04/040421234637.htm
University Of Southern California. "Stacked, Packed Nanowires Hold Triplexed Megadata." ScienceDaily. www.sciencedaily.com/releases/2004/04/040421234637.htm (accessed October 24, 2014).

Share This



More Matter & Energy News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins