Penn: Office of University Communications: Water and = Nanoelectronics Will Mix to Create Ultra-Dense Memory Storage Devices, = Researchers Say

From: Subject: Penn: Office of University Communications: Water and Nanoelectronics Will Mix to Create Ultra-Dense Memory Storage Devices, Researchers Say Date: Fri, 28 Apr 2006 10:38:27 -0400 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0000_01C66AAF.E257BE20"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C66AAF.E257BE20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.upenn.edu/pennnews/article.php?id=956 Penn: Office of University Communications: Water and = Nanoelectronics Will Mix to Create Ultra-Dense Memory Storage Devices, = Researchers Say

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Greg Lester

215-573-6604

glester@pobox.upenn.edu

Water=20 and Nanoelectronics Will Mix to Create Ultra-Dense Memory = Storage=20 Devices, Researchers Say
April 26,=20 2006

PHILADELPHIA -- Excessive moisture can typically = wreak=20 havoc on electronic devices, but now researchers have = demonstrated=20 that a little water can help create ultra-dense storage = systems for=20 computers and electronics.

A team of experimentalists and theorists at the = University of=20 Pennsylvania, Drexel University and Harvard University has = proposed=20 a new and surprisingly effective means of stabilizing and=20 controlling ferroelectricity in nanostructures: terminating = their=20 surfaces with fragments of water. Ferroelectrics = are=20 technologically important "smart" materials for many = applications=20 because they have local dipoles, which can switch up and = down to=20 encode and store information. The team's work is = reported in=20 the April issue of Nano Letters.

"It is astonishing to see that a single wire of even a = few atoms=20 across can act as a stable and switchable dipole memory = element,"=20 Jonathan Spanier, assistant professor of materials science = and=20 engineering at Drexel, said.

Spanier and his colleagues successfully demonstrated the = benefits=20 of using water to stabilize memory bits in segments of oxide = nanowires that are only about 3 billionths of a meter = wide.

"We have been interested in how water sticks to oxides," = Alexie=20 Kolpak, Penn graduate student in theoretical physical = chemistry,=20 said. "We are particularly excited that water is the = key=20 ingredient in making these wires 'remember' their = state."

In this investigation, led by Hongkun Park of Harvard and = Andrew=20 Rappe of Penn, the researchers probed oxide nanowires = individually=20 to characterize the size-dependence of ferroelectricity and=20 performed calculations and experiments to validate the = presence of=20 molecules on oxide surfaces and detail their important role = in=20 nanoscale ferroelectricity. Significantly, these = results show=20 that ferroelectric surfaces with water fragments or other = molecules=20 can stabilize ferroelectricity in smaller structures than = previously=20 thought.

Though a scheme for the dense arrangement and addressing = of these=20 nanowires remains to be developed, such an approach would = enable a=20 storage density of more than 100,000 terabits per cubic = centimeter.=20 If this memory density can be realized commercially, a = device the=20 size of an iPod nano could hold enough MP3 music to play for = 300,000=20 years without repeating a song or enough DVD quality video = to play=20 movies for 10,000 years without repetition.

This work is supported by the National Science = Foundation, the=20 Packard Foundation, the Dreyfus Foundation, the Office of = Naval=20 Research, the Center for Piezoelectric Design and the Army = Research=20 Office.

Copyright =A9 2006, University of = Pennsylvania
Office of=20 University Communications
200 Sansom Place East, 3600 = Chestnut=20 Street, Philadelphia, PA 19104-6106
Copyright= =20 Information | Contact U = s | Privacy Policy | = Disclaimer=20

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#011f5b; TEXT-DECORATION: none } ------=_NextPart_000_0000_01C66AAF.E257BE20 Content-Type: application/x-javascript Content-Transfer-Encoding: 7bit Content-Location: http://www.upenn.edu/pennnews/global.js // preload images used in toolbar rollovers if (document.images) { // toolbars home1 = new Image(28,23); home1.src = "images/toolbar/home1.gif"; home2 = new Image(28,23); home2.src = "images/toolbar/home2.gif"; az1 = new Image(44,23); az1.src = "images/toolbar/az1.gif"; az2 = new Image(44,23); az2.src = "images/toolbar/az2.gif"; directories1 = new Image(54,23); directories1.src = "images/toolbar/directories1.gif"; directories2 = new Image(54,23); directories2.src = "images/toolbar/directories2.gif"; calendar1 = new Image(45,23); calendar1.src = "images/toolbar/calendar1.gif"; calendar2 = new Image(45,23); calendar2.src = "images/toolbar/calendar2.gif"; maps1 = new Image(27,23); maps1.src = "images/toolbar/maps1.gif"; maps2 = new Image(27,23); maps2.src = "images/toolbar/maps2.gif"; logout1 = new Image(84,23); logout1.src = "images/toolbar/logout1.gif"; logout2 = new Image(84,23); logout2.src = "images/toolbar/logout2.gif"; users1 = new Image(69,23); users1.src = "images/toolbar/users1.gif"; users2 = new Image(69,23); users2.src = "images/toolbar/users2.gif"; // print / email controls print1 = new Image(42,12); print1.src = "images/print1.gif"; print2 = new Image(42,12); print2.src = "images/print2.gif"; email1 = new Image(42,9); email1.src = "images/email1.gif"; email2 = new Image(42,9); email2.src = "images/email2.gif"; // menu commhome1 = new Image(175,19); commhome1.src = "images/menu/commhome1.gif"; commhome2 = new Image(175,19); commhome2.src = "images/menu/commhome2.gif"; releases1 = new Image(175,19); releases1.src = "images/menu/releases1.gif"; releases2 = new Image(175,19); releases2.src = "images/menu/releases2.gif"; penn1 = new Image(175,19); penn1.src = "images/menu/penn1.gif"; penn2 = new Image(175,19); penn2.src = "images/menu/penn2.gif"; experts1 = 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