Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Researcher suggests new memory storage mineral

A representation of the mineral kotoite's crystal structure. The oxygen atoms are red, and the magnesium atoms are located at the centers of the green octahedra. The boron atoms are located at the centers of the blue triangles connecting the oxygen atoms. Derek Stewart.
A representation of the mineral kotoite's crystal structure. The oxygen atoms are red, and the magnesium atoms are located at the centers of the green octahedra. The boron atoms are located at the centers of the blue triangles connecting the oxygen atoms. Derek Stewart.

Abstract:
Breakthroughs in electronics often are the result of finding just the right material for a device -- like the tungsten in light bulbs or the silicon in transistors. Now, a Cornell scientist believes that the mineral kotoite could be an ideal insulator for memory storage devices called magnetic tunnel junctions, found in computers, cell phones and magnetic field sensors.

Researcher suggests new memory storage mineral

Ithaca, NY | Posted on January 21st, 2010

The work, building on previous research by other Cornell scientists, is published by Derek Stewart, the Cornell NanoScale Science and Technology Facility's computational research associate, in the Dec. 17 online edition of Nano Letters (to appear later in print).

Magnetic tunnel junctions are made of a sandwich of two magnets, typically iron-based, with an oxide in the middle only nanometers thick. (A nanometer is one-billionth of a meter.) Electrons "tunnel" between the two magnets, and the oxide filters information from the electrons' spin states to create what is called nonvolatile memory, which doesn't require electricity to store information. These junctions are also used as very sensitive magnetic sensors or read heads for hard drives, since the device currents depend on the relative orientation of the iron layers' magnetic poles.

Cornell researchers, including Robert Buhrman, the John Edson Sweet Professor of Engineering, and Dan Ralph, the Horace White Professor of Physics, have been on the leading edge of this technology for several years.

In industry today, most magnetic tunnel junctions use aluminum oxide as the insulator. But in labs across the world, magnesium oxide is being tested as a next-generation insulator, because its cubic crystal structure matches well with the metallic leads, allowing more efficient filtering of electrons. John Read, a former graduate student in Buhrman's lab (now a postdoctoral associate at the National Institute of Standards and Technology), discovered by accident that the element boron, which he had used at Cornell while fabricating magnetic tunnel junctions to help smooth the material interfaces, was leaking into the insulators and forming a crystal, rather than diffusing away as intended. Yet the devices still worked.

Curious, the team tapped Stewart's computational expertise to work backward and figure out what specific material may have been inadvertently created between the two magnets as a result of the boron contamination.

Density functional calculations brought Stewart to kotoite (Mg3B2O6), a magnesium oxide that also has two boron atoms, which matches well with the magnets' chemistry, allows good electron filtering, and has a slightly different crystal shape than plain magnesium oxide (MgO). He also demonstrated that the mineral's crystal shape -- orthorhombic, as opposed to magnesium oxide's cubic symmetry -- could lead to even better electron spin filtering.

"Derek did a beautiful job of demonstrating that the symmetry arguments that one makes for magnesium oxide can be demonstrated for [kotoite]," Read said.

Calculations were done on the Intel Cluster at CNF, which is funded by the National Science Foundation.

####

About Cornell University
Once called "the first American university" by educational historian Frederick Rudolph, Cornell University represents a distinctive mix of eminent scholarship and democratic ideals. Adding practical subjects to the classics and admitting qualified students regardless of nationality, race, social circumstance, gender, or religion was quite a departure when Cornell was founded in 1865.

Today's Cornell reflects this heritage of egalitarian excellence. It is home to the nation's first colleges devoted to hotel administration, industrial and labor relations, and veterinary medicine. Both a private university and the land-grant institution of New York State, Cornell University is the most educationally diverse member of the Ivy League.

On the Ithaca campus alone nearly 20,000 students representing every state and 120 countries choose from among 4,000 courses in 11 undergraduate, graduate, and professional schools. Many undergraduates participate in a wide range of interdisciplinary programs, play meaningful roles in original research, and study in Cornell programs in Washington, New York City, and the world over.

For more information, please click here

Contacts:
Media Contact:
Blaine Friedlander
(607) 254-8093


Cornell Chronicle:
Anne Ju
(607) 255-9735

Related Information

Copyright © Cornell University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

Chemical interactions between silver nanoparticles and thiols: A comparison of mercaptohexanol again September 30th, 2014

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

Physics

Brookhaven Lab's National Synchrotron Light Source II Approved to Start Routine Operations: Milestone marks transition to exciting new chapter September 23rd, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

Elusive Quantum Transformations Found Near Absolute Zero: Brookhaven Lab and Stony Brook University researchers measured the quantum fluctuations behind a novel magnetic material's ultra-cold ferromagnetic phase transition September 15th, 2014

Excitonic Dark States Shed Light on TMDC Atomic Layers: Berkeley Lab Discovery Holds Promise for Nanoelectronic and Photonic Applications September 11th, 2014

Govt.-Legislation/Regulation/Funding/Policy

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

How things coil: Researchers discover that simulation technology designed for Hollywood can be used as a predictive tool for understanding fundamental engineering problems September 29th, 2014

UT Arlington researchers develop transparent nanoscintillators for radiation detection for medical safety and homeland security September 29th, 2014

'Pixel' engineered electronics have growth potential: Rice, Oak Ridge, Vanderbilt, Penn scientists lead creation of atom-scale semiconducting composites September 29th, 2014

Possible Futures

Air Forceís 30-year plan seeks 'strategic agility' August 1st, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Memory Technology

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Promising Ferroelectric Materials Suffer From Unexpected Electric Polarizations: Brookhaven Lab scientists find surprising locked charge polarizations that impede performance in next-gen materials that could otherwise revolutionize data-driven devices August 18th, 2014

Can our computers continue to get smaller and more powerful? University of Michigan computer scientist reviews frontier technologies to determine fundamental limits of computer scaling August 13th, 2014

Nanoelectronics

Grenoble Hosting SEMICON Europa Oct. 7-9, First Time Event Held in France: Letiís 90-square-meter Booth Will Feature Portable Showroom To Demonstrate New Technology Innovations September 24th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Excitonic Dark States Shed Light on TMDC Atomic Layers: Berkeley Lab Discovery Holds Promise for Nanoelectronic and Photonic Applications September 11th, 2014

Discoveries

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

Chemical interactions between silver nanoparticles and thiols: A comparison of mercaptohexanol again September 30th, 2014

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

Announcements

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

Chemical interactions between silver nanoparticles and thiols: A comparison of mercaptohexanol again September 30th, 2014

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE