Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Detecting tiny twists with a nanomachine

Abstract:
Nanoscale device may reveal spin-dependent fundamental forces and provide new methods of characterizing torque-generating molecules and DNA strands

Detecting tiny twists with a nanomachine

Boston, MA | Posted on November 5th, 2008

Researchers at Boston University working with collaborators in Germany, France and Korea have developed a nanoscale torsion resonator that measures miniscule amounts of twisting or torque in a metallic nanowire. This device, the size of a speck of dust, might enable measurements of the untwisting of DNA and have applications in spintronics, fundamental physics, chemistry and biology.

Spin-induced torque is central to understanding experiments, from the measurement of angular momentum of photons to the measurement of the gyromagnetic factor of metals and a very miniaturized - about 6 microns -- version of a gyroscope that measures the torques produced by electrons changing their spin states. It can be used to uncover new spin-dependent fundamental forces in particle physics, according to Raj Mohanty, Boston University Associate Professor of Physics.

"This is perhaps the most sensitive torque measurement every reported," said Mohanty. "The size of the torque measured by this experiment is smaller than the typical torque produced by the untwisting of a doubly-stranded DNA."

In a just released paper in Nature Nanotechnology entitled "Nanomechanical detection of itinerant electron spin flip," Mohanty and his research team developed a highly sensitive way to directly measure torque using microelectronic mechanical systems with spin electronics. Their approach was to detect and control spin-flip torque -- a phenomenon that occurs in a metallic nanowire, that is half ferromagnetic and the other is nonmagnetic. The spins of itinerant electrons are "flipped" at the interface between the two regions to produce a torque.

The team developed a microscopic spin-torsion device fabricated by electron beam lithography and nanomachining that mechanically measures the changes in spin states in a magnetic field. This device was operated at one tenth of a degree close to absolute zero.

The team has been working on demonstrating the opposite effect. Under the application of an external torque spin-up and spin-down electrons can be separated to two physically distinct locations, creating a spin battery. This is similar to a conventional charge battery with positive and negative polarities. When connected with an electrical path, electricity flows from one side to the other. But instead of electric current, the flow in the spin battery involves the spin - which can be used to store and manipulate information, the basis of an emerging technology called spintronics.

"The measurements with a nanoscale torsion resonator will be useful in uncovering new fundamental forces and, in theory, for characterizing torque producing molecules and DNA." said Mohanty.

Mohanty's research collaborators for the paper are Guiti Zolfagharkhani, then a graduate student at Boston University's Department of Physics, Alexi Gaidarzhy then a graduate student of BU's Department of Mechanical and Aerospace Engineering, Pascal Degiovanni of the Ecole Normale Superieure and Universite de Lyon in France, Stefan Kettemann of Jacobs University in Bremen, Germany and Peter Fulde at the Asia Pacific Center for Theoretical Physics in Namgu Pohang, Korea.

The research was supported by National Science Foundation

####

About Boston University
Founded in 1839, Boston University is an internationally recognized institution of higher education and research. With more than 30,000 students, it is the fourth largest independent university in the United States. BU consists of 17 colleges and schools along with a number of multi-disciplinary centers and institutes which are central to the school's research and teaching mission.

For more information, please click here

Contacts:
Ronald Rosenberg

617-358-1240

Copyright © Boston 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

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

Leica Microsystems Presents Universal Hybrid Detector for Single Molecule Detection and Imaging at SfN and ASCB: Leica HyD SMD - the Optimal Detector for Precise and Reliable SMD data November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Chemistry

UO-industry collaboration points to improved nanomaterials: University of Oregon microscope puts spotlight on the surface structure of quantum dots for designing new solar devices November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Production of Magnetic Nanoparticles with New Structures in Iran November 13th, 2014

Physics

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

Heat Transfer Sets the Noise Floor for Ultrasensitive Electronics November 11th, 2014

Noise in a microwave amplifier is limited by quantum particles of heat November 10th, 2014

Govt.-Legislation/Regulation/Funding/Policy

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

Sustainable Nanotechnologies Project November 20th, 2014

Quantum mechanical calculations reveal the hidden states of enzyme active sites November 20th, 2014

NRL Scientists Discover Novel Metamaterial Properties within Hexagonal Boron Nitride November 20th, 2014

Molecular Machines

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Crystallizing the DNA nanotechnology dream: Scientists have designed the first large DNA crystals with precisely prescribed depths and complex 3D features, which could create revolutionary nanodevices October 20th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster: University of Leicester research team unlocks insights into creation of new nano-materials July 25th, 2014

Molecular Nanotechnology

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

Manipulating complex molecules by hand: New method in scanning probe microscopy: Jülich researchers create a word using 47 molecules November 6th, 2014

Measuring nano-vibrations November 5th, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Spintronics

Researchers create & control spin waves, lifting prospects for enhanced info processing November 17th, 2014

Pseudospin-driven spin relaxation mechanism in graphene November 11th, 2014

New Electron Spin Secrets Revealed November 10th, 2014

Implementation of DNA Chains in Designing Nanospin Pieces November 9th, 2014

Discoveries

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

UO-industry collaboration points to improved nanomaterials: University of Oregon microscope puts spotlight on the surface structure of quantum dots for designing new solar devices November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 2014

Announcements

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

Leica Microsystems Presents Universal Hybrid Detector for Single Molecule Detection and Imaging at SfN and ASCB: Leica HyD SMD - the Optimal Detector for Precise and Reliable SMD data November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 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