Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Tiny magnetic switch discovered

Professor Rainer Herges (left) and Marcel Dommaschk irradiate a solution of the molecular magnet switch with blue-green and blue-violet light. The researchers can change the magnetic state of the molecule using the light waves. Copyright: CAU, Photo: Torsten Winkler
Professor Rainer Herges (left) and Marcel Dommaschk irradiate a solution of the molecular magnet switch with blue-green and blue-violet light. The researchers can change the magnetic state of the molecule using the light waves. Copyright: CAU, Photo: Torsten Winkler

Abstract:
Scientists at Kiel University develop molecular machine in form of record player

Tiny magnetic switch discovered

Kiel | Posted on January 28th, 2011

A Kiel research group headed by the chemist, Professor Rainer Herges, has succeeded for the first time in directly controlling the magnetic state of a single molecule at room temperature. The paper will appear this Friday (28 January 2011) in Science magazine. The switchable molecule, which is the result of a sub-project of the Collaborative Research Centre 677 "Function by Switching", could be used both in the construction of tiny electromagnetic storage units and in the medical imaging.

The scientists at the Kiel University developed a molecular machine constructed in a similar way to a record player. The molecule consists of a nickel ion surrounded by a pigment ring (porphyrin), and a nitrogen atom which hovers above the ring like the tone arm on a record player. "When we irradiate this molecule with blue-green light, the nitrogen atom is placed exactly vertically to the nickel ion like a needle", Rainer Herges explains. "This causes the nickel ion to become magnetic, because the pairing of two electrons is cancelled out", says the chemistry professor. The counter effect is blue-violet light: The nitrogen atom is raised, the electrons form a pair and the nickel ion is no longer magnetic. "We can repeat this switching of the magnetic state over 10,000 times by varied irradiation with the two different wavelengths of light, without wearing out the molecular machine or encountering side reactions", Herges enthuses.

The switch which has been discovered, with its diameter of only 1.2 nanometres, could be used as a tiny magnetic reservoir in molecular electronics. Most of all, hard disk manufacturers may be interested in this, as a higher storage capacity can be achieved by reducing the size of the magnetic particles on the surface of the disks. Professor Herges also believes the use of the magnetic switch in the medical field is feasible: "The record player molecule can be used intravenously as a contrast agent in MRT (magnetic resonance tomography) in order to search for tumours or constricted blood vessels. Initial tests in the University Medical Center Schleswig-Holstein's neuroradiology department were successful." As the signal-to-noise ratio is improved by the switching process, a smaller amount of the contrast agent is required than for the magnetic salts currently being used. In addition, according to Herges, the molecular machine could also serve as a basis for developing new contrast agents to depict such features as temperature, pH value or even certain biochemical markers in the body in a three-dimensional form. Rainer Herges lists the possible fields of application: "Using contrast agents such as these, it could be possible to localise centres of inflammation, detect tumours and visualise many metabolic processes."

The Christian-Albrechts-Universität zu Kiel has proven international expertise as a North German research university in the field of Nanoscience, for example, in the German Research Foundation's Collaborative Research Centre 677 "Function by Switching". Furthermore, the CAU is applying for the current round of the Excellence Initiative with a nano-excellence cluster.

Original publication:
Magnetic Bistability of Molecules in homogenous Solution at Room Temperature. Science 28 January 2011, DOI: 10.1126/science.1201180

####

For more information, please click here

Contacts:
Professor Dr Rainer Herges
Otto Diels Institute of Organic Chemistry
Christian-Albrechts-Universität zu Kiel
Phone: +49 (0)431 880-2440

Copyright © Christian-Albrechts-Universität zu Kiel

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

New synthesis method may shape future of nanostructures, clean energy: Findings advance efficient solar spliting of water into hydrogen fuel September 2nd, 2014

Accounting for Biological Aggregation in Heating and Imaging of Magnetic Nanoparticles September 2nd, 2014

Engineers develop new sensor to detect tiny individual nanoparticles September 2nd, 2014

Future solar panels September 2nd, 2014

Possible Futures

Air Force’s 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

Academic/Education

New Vice President Takes Helm at CNSE CMOST: Catherine Gilbert To Lead CNSE Children’s Museum of Science and Technology Through Expansion And Relocation August 29th, 2014

RMIT delivers $30m boost to micro and nano-tech August 26th, 2014

SEMATECH and Newly Merged SUNY CNSE/SUNYIT Launch New Patterning Center to Further Advance Materials Development: Center to Provide Access to Critical Tools that Support Semiconductor Technology Node Development August 7th, 2014

Oxford Instruments Asylum Research and the Center for Nanoscale Systems at Harvard University Present a Workshop on AFM Nanomechanical and Nanoelectrical Characterization, Aug. 21-22 August 6th, 2014

Molecular Machines

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

NIST shows ultrasonically propelled nanorods spin dizzyingly fast July 22nd, 2014

University of Illinois researchers demonstrate novel, tunable nanoantennas July 14th, 2014

Nanomedicine

UO-Berkeley Lab unveil new nano-sized synthetic scaffolding technique: Oil-and-water approach from Richmond's UO lab to spark new line of versatile peptoid nanosheets September 2nd, 2014

Accounting for Biological Aggregation in Heating and Imaging of Magnetic Nanoparticles September 2nd, 2014

Nano-forests to reveal secrets of cells September 2nd, 2014

Nanoscale assembly line August 29th, 2014

Nanoelectronics

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

Announcements

New synthesis method may shape future of nanostructures, clean energy: Findings advance efficient solar spliting of water into hydrogen fuel September 2nd, 2014

Accounting for Biological Aggregation in Heating and Imaging of Magnetic Nanoparticles September 2nd, 2014

Engineers develop new sensor to detect tiny individual nanoparticles September 2nd, 2014

Future solar panels September 2nd, 2014

Tools

Accounting for Biological Aggregation in Heating and Imaging of Magnetic Nanoparticles September 2nd, 2014

Raman Whispering Gallery Detects Nanoparticles September 1st, 2014

New analytical technology reveals 'nanomechanical' surface traits August 29th, 2014

Ultra-Low Frequency Vibration Isolation Stabilizes Scanning Tunneling Microscopy at UCLA’s Nano-Research Group August 28th, 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