Welcome to biology-online.org! Please login to access all site features. Create an account.
Log me on automatically each visit
Biology Articles » Biophysics » ASU professor finds new twist to old theory
Tempe, AZ, Physics and Astronomy professor Ralph V. Chamberlin has found a new twist to an old theory of magnetism. By using a novel application of thermodynamics, Chamberlin successfully extended the range of the mean-field theory of ferromagnetism to accurately describe the behavior of ferromagnetic materials across a broader range of temperatures.
The mean-field theory of ferromagnetism, created in 1907 by Pierre Weiss, was an important milestone in the development of modern physics. It describes the properties of strongly magnetic materials, such as iron, but had an impact far beyond magnet research.
"Mean-field theory was the first viable model for ferromagnetism. Although its predictions near the transitional temperature have been found to be inaccurate, it remains popular as the most versatile approach for describing many different properties in a wide-range of materials," said Chamberlin.
For the past 30 years, an alternative theory has been used for the behavior near the transition. Chamberlin's groundbreaking research shows that the mean-field theory can be extended down to the transition so there is no need for a separate theory.
The mean-field approach can, in fact, describe the behavior of ferromagnets in this regime, as well as higher temperatures. "This becomes possible by including the effect of small, nanometer-sized clusters in the sample," he says.
Arizona State University. November 2000.
rating: 0.00 from 0 votes | updated on: 16 Dec 2007 | views: 1263 |
share this article | email to friends
suggest a revision
print this page
© Biology-Online.org. All Rights Reserved. Register | Login | About Us | Contact Us | Link to Us | Disclaimer & Privacy