Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Dartmouth researchers discover chromium's hidden magnetic talents

 Yeong-Ah Soh (photo by Joseph Mehling '69)
Yeong-Ah Soh (photo by Joseph Mehling '69)

Abstract:
Two Dartmouth researchers have determined that the element chromium displays electrical properties of magnets in surprising ways. This finding can be used in the emerging field of "spintronics," which might someday contribute to new and more energy-efficient ways of processing and storing data.

Dartmouth researchers discover chromium's hidden magnetic talents

Hanover, NH | Posted on April 16th, 2008

The study, titled "Electrical effects of spin density wave quantization and magnetic domain walls in chromium," will be published in the April 17 issue of the journal Nature.

Electrons have an intrinsic angular momentum, called spin, in addition to their electrical charge. In electronics work, it is the charge of the electron that is used for calculations and transmitting information. In spintronics, it is the electron spin that is exploited.

"The phenomena that we have discovered are likely to lead to new applications of chromium," says Yeong-Ah Soh, the lead researcher on the paper and an associate professor of physics and astronomy at Dartmouth. She worked on the study with Ravi Kummamuru, a former post-doctoral research associate at Dartmouth now at the University of Illinois at Urbana-Champagne.

She goes on to explain that in essence, this indicates that a simple and well-known element, chromium, displays different electrical properties on heating and cooling. These differences reflect subtle internal rearrangements of the electrons and their spins.

In ferromagnets, the kind of common magnet you might see on a refrigerator, the spins of electrons interact with each other leading to alignment. In antiferromagnets, however, the interactions between neighboring electron spins are such that they are opposed. Researchers have long studied the electrical properties of ferromagnets and the influence of electron spin. Less attention has been paid, according to Soh and Kummamuru, to the influence of spin on the electrical properties in antiferromagnets, where it is more difficult to manipulate, and chromium is special since it is the only simple element that is an antiferromagnet.

"Antiferromagnets are used in numerous fields: physics, materials science, and chemistry, and they are increasingly used in technology, where they are found in the tiny heads that read the data on computer disc drives," says Soh. "Our research opens the entire new field of controlled electrical effects at a slightly-larger-than-quantum scale in antiferromagnets. The findings show that not only ferromagnets can be used in spintronics; there is a possibility that antiferromagnets can also be employed to manipulate and store information."

####

About Dartmouth College
Dartmouth College educates the most promising students and prepares them for a lifetime of learning and of responsible leadership, through a faculty dedicated to teaching and the creation of knowledge.

For more information, please click here

Contacts:
Susan Knapp
(603) 646-3661

Copyright © Dartmouth College

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

Untangling DNA with a droplet of water, a pipet and a polymer: With the 'rolling droplet technique,' a DNA-injected water droplet rolls like a ball over a platelet, sticking the DNA to the plate surface February 27th, 2015

Rice's Stephan Link honored for nanoscience research: The Welch Foundation honors ‘rising star’ with $100,000 Hackerman Award February 26th, 2015

Indefinite Life Extension Activists Organize Online Demonstration February 26th, 2015

Renishaw and Bruker team up for a workshop on TERS and co-localised AFM Raman February 26th, 2015

Spintronics

Insight into inner magnetic layers: Measurements at BESSY II have shown how spin filters forming within magnetic sandwiches influence tunnel magnetoresistance -- results that can help in designing spintronic component- February 17th, 2015

A new spin on spintronics: Michigan team tests radiation-resistant spintronic material, possibly enabling electronic devices that will work in harsh environments February 17th, 2015

Nanoscale Mirrored Cavities Amplify, Connect Quantum Memories: Advance could lead to quantum computing and the secure transfer of information over long-distance fiber optic networks January 28th, 2015

Piezoelectricity in a 2-D semiconductor: Berkeley Lab researchers discovery of piezoelectricty in molybdenum disulfide holds promise for future MEMS December 22nd, 2014

Discoveries

Untangling DNA with a droplet of water, a pipet and a polymer: With the 'rolling droplet technique,' a DNA-injected water droplet rolls like a ball over a platelet, sticking the DNA to the plate surface February 27th, 2015

Real-time observation of bond formation by using femtosecond X-ray liquidography February 26th, 2015

Graphene shows potential as novel anti-cancer therapeutic strategy: University of Manchester scientists have used graphene to target and neutralise cancer stem cells while not harming other cells February 26th, 2015

Simple, Cost-Efficient Method Used to Determine Toxicants Growing in Pistachio February 26th, 2015

Announcements

Untangling DNA with a droplet of water, a pipet and a polymer: With the 'rolling droplet technique,' a DNA-injected water droplet rolls like a ball over a platelet, sticking the DNA to the plate surface February 27th, 2015

Real-time observation of bond formation by using femtosecond X-ray liquidography February 26th, 2015

Bruker-Sponsored Sixth AFM BioMed Conference Highlights Increasing Impact of AFM in Biological Applications February 26th, 2015

Graphene shows potential as novel anti-cancer therapeutic strategy: University of Manchester scientists have used graphene to target and neutralise cancer stem cells while not harming other cells February 26th, 2015

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 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE