Home > Press > Researchers Create Tiny Magnetic Diamonds on the Nanoscale
Tiny diamond magnets could find use in fields ranging from medicine to information technology
Rensselaer Researchers Create Tiny Magnetic Diamonds on the Nanoscale
Troy, NY |September 12, 2005
Diamonds have always been alluring, but now a team of scientists has made them truly magnetic — on the nanoscale.
In a paper published in the Aug. 26 issue of Physical Review Letters, the researchers report a technique to make magnetic diamond particles only 4-5 nanometers across. The tiny diamond magnets could find use in fields ranging from medicine to information technology.
Ferromagnetism has been historically reserved for metals, but scientists are becoming increasingly interested in the prospect of creating metal-free magnets, particularly from carbon-based materials. Diamond is a naturally occurring crystalline form of carbon.
Magnets made from carbon could have a number of advantages over their metal counterparts. “Carbon is lightweight, very stable, simple to process, and less expensive to produce,” says Saikat Talapatra, a post-doctoral research associate with the Rensselaer Nanotechnology Center at Rensselaer Polytechnic Institute.
Talapatra is lead author of the study, which also included researchers from NASA Ames Research Center in California; Richmond, Va.-based Philip Morris USA; and the University at Albany.
“These findings could lead to a systematic, controllable method for producing magnetic carbon materials,” says Pulickel Ajayan, the Henry Burlage Professor of Materials Science and Engineering at Rensselaer and co-author of the paper. “Though the value of the magnetization is much lower than in regular magnets, the nature of the spin interactions in carbon could lead to a number of potential applications.”
Magnetic nanocarbons could make promising structures for high-density memory devices and in quantum computers. And because carbon materials are generally compatible with living tissue, these nanostructures could be useful in medical applications such as magnetic resonance imaging (MRI) and the targeted delivery of drugs to specific parts of the body.
Researchers have long known that defects and irregularities in pure carbon materials can give rise to electrons that are not paired with other electrons. Each “unpaired” electron produces a magnetic field by its spinning, and when all of the spins align, the material itself becomes magnetic. Talapatra and his colleagues have developed a way to modify the structure of carbon in a controlled manner by firing clusters of atoms at the diamond particles. This produces magnetism at room temperature, and the total strength of the magnetism depends on the amount and type of atoms used.
The next step, according to Talapatra, is to calculate how the types of defects and their concentration in the pure carbon structure affect the magnitude of magnetism. “We are also working toward developing simpler ways to make magnetic nanocarbons in a more controlled fashion,” he says. “The long-term goal is to show some real applications using these structures.”
Other Rensselaer researchers involved in the work were Robert Vajtai, laboratory manager for the Rensselaer Nanotechnology Center; Ganapathiraman Ramanath, associate professor of materials science and engineering; Mutsuhiro Shima, assistant professor of materials science and engineering; Gopal Ganesan Pethuraja, research engineer with the Center for Integrated Electronics; and Taegyun Kim, graduate student in materials science and engineering.
The research was funded by NASA, Philip Morris USA, and the National Science Foundation.
Nanotechnology at Rensselaer:
In September 2001, the National Science Foundation selected Rensselaer as one of the six original sites nationwide for a new Nanoscale Science and Engineering Center (NSEC). As part of the U.S. National Nanotechnology Initiative, the program is housed within the Rensselaer Nanotechnology Center and forms a partnership between Rensselaer, the University of Illinois at Urbana-Champaign, and Los Alamos National Laboratory. The mission of Rensselaer’s Center for Directed Assembly of Nanostructures is to integrate research, education, and technology dissemination, and to serve as a national resource for fundamental knowledge and applications in directed assembly of nanostructures. The five other original NSECs are located at Harvard University, Columbia University, Cornell University, Northwestern University, and Rice University.
About Rensselaer Polytechnic Institute:
Rensselaer Polytechnic Institute, founded in 1824, is the nation’s oldest technological university. The school offers degrees in engineering, the sciences, information technology, architecture, management, and the humanities and social sciences. Institute programs serve undergraduates, graduate students, and working professionals around the world. Rensselaer faculty are known for pre-eminence in research conducted in a wide range of research centers that are characterized by strong industry partnerships. The Institute is especially well known for its success in the transfer of technology from the laboratory to the marketplace so that new discoveries and inventions benefit human life, protect the environment, and strengthen economic development.
For more information, please visit www.rpi.edu
Copyright © Rensselaer Polytechnic Institute
If you have a comment, please Contact
Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014
Researchers discern the shapes of high-order Brownian motions November 17th, 2014
VDMA Electronics Production Equipment: Growth track for 2014 and 2015 confirmed: Business climate survey shows robust industry sector November 14th, 2014
Open Materials Development Will Be Key for HP's Success in 3D Printing: HP can make a big splash in 3D printing, but it needs to shore up technology claims and avoid the temptation of the razor/razor blade business model in order to flourish November 11th, 2014
Sustainable Nanotechnologies Project November 20th, 2014
Total Nanofiber Solutions Company FibeRio® Launches The Fiber Engine® FX Series Systems with 10X Increase in Output November 18th, 2014
Nanocomposites Strengthen Bone Implants November 13th, 2014
Production of Magnetic Nanoparticles with New Structures in Iran November 13th, 2014
New research project supports internationalisation in nano-research: Launch of new “Baltic Sea Network” November 22nd, 2014
3rd Iran-Proposed Nano Standard Approved by International Standard Organization November 22nd, 2014
NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014
Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 2014