Navigation Links
NIST researchers put a new spin on atomic musical chairs
Date:12/4/2009

Researchers from the National Institute of Standards and Technology (NIST) and the Naval Research Laboratory have developed a new way to introduce magnetic impurities in a semiconductor crystal by prodding it with a scanning tunneling microscope (STM). Detailed in a recent paper,* this technique will enable researchers to selectively implant atoms in a crystal one at a time to learn about its electrical and magnetic properties on the atomic scale.

A better understanding of these properties is fundamental to the development of "spintronics," electronic devices that will use electron spin, a characteristic of magnetism, instead of charge for storing information. Spintronics could increase the performance of electronic devices while reducing power usage and production costs.

Electronics manufacturers commonly introduce impurities into semiconducting crystals to change how well the material will conduct electricity. Researchers also can introduce impurities that induce a semiconductor to become magnetic. In these dilute magnetic semiconductors (DMS), the added impurity atoms typically must displace one of the original atoms in the crystal structure to become "active." One of the goals of DMS materials research is to achieve higher operating temperatures by making sure all the doped magnetic impurity atoms are activated. Knowing how the impurity atoms get into the host crystal lattice sites is essential to this process.

The experiments involved depositing single manganese atoms onto an indium arsenide surface. To become active and magnetize the DMS, the manganese atom must take a chair from one of the indium atoms by occupying an indium lattice site. Using the STM probe tip, the NIST researchers zapped an indium atom with sufficient voltage to dislodge it from its place in the lattice and switch places with the manganese atom. In this way the researchers can choose where and which manganese atom they want to make active.

Because the exchange happens very quickly, researchers cannot see what path the atoms take when made to play musical chairs. To find the pathway, researchers at the Naval Research Laboratory made theoretical models of the atomic motions and identified two possible avenues for the exchange to occur. The group selected the correct pathway by comparing the calculation results with the experimental STM findings.


'/>"/>

Contact: Mark Esser
mark.esser@nist.gov
301-975-8735
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Elsevier is Re-Launching "Embase" to be a Powerful Resource Providing Deep Insights and Answers to Biomedical Researchers
2. Knome Launches First Platform-Agnostic Human Genome Sequencing and Analysis Service for Researchers
3. UT Knoxville and ORNL researchers turn algae into high-temperature hydrogen source
4. Berkeley researchers take the lead out of piezoelectrics
5. 80% of Researchers Surveyed Believe Their Laboratories Are Not Run Efficiently
6. Pitt-led researchers create nanoparticle coating to prevent freezing rain buildup
7. Berkeley researchers find new route to nano self-assembly
8. Small ... smaller ... smallest? ASU researchers create molecular diode
9. Researchers Present a Novel, Automated, Efficient Environmental Disinfection Technology that Significantly Reduces C. difficile, VRE and MRSA Contamination
10. Researchers create smaller and more efficient nuclear battery
11. Researchers Use Oragene●DNA to Find Genetic Link to Neglected Tropical Disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NIST researchers put a new spin on atomic musical chairs
(Date:6/22/2017)... , ... June 22, 2017 , ... The first human ... 20 years until the first data on cross-contamination of human cell lines with HeLa ... an increasing issue in cell culture labs and is associated with dramatic consequences for ...
(Date:6/20/2017)... (PRWEB) , ... June 20, 2017 , ... ... to immediately determine the adulterants which pose the most likely threat to their ... 28 of this year. , IFT's annual food expo attracts over 20,000 ...
(Date:6/19/2017)... , ... June 19, 2017 , ... ... all service activities supporting EDETEK’s products including training, implementation, support, and client process ... his new role. He has previously held leadership roles for service providers and ...
(Date:6/16/2017)... ... June 16, 2017 , ... Cambridge Semantics ... that its Anzo Smart Data Lake® (Anzo SDL) solution was named a ... 2017 Software & Information Industry Association (SIIA) CODiE Awards. , Finalists represent ...
Breaking Biology Technology:
(Date:4/11/2017)... 2017 Research and Markets has announced the ... to their offering. ... eye tracking market to grow at a CAGR of 30.37% during ... Market 2017-2021, has been prepared based on an in-depth market analysis ... and its growth prospects over the coming years. The report also ...
(Date:4/11/2017)... 2017 NXT-ID, Inc. (NASDAQ:   NXTD ... the appointment of independent Directors Mr. Robin D. Richards ... of Directors, furthering the company,s corporate governance and expertise. ... Gino Pereira , Chief ... to their guidance and benefiting from their considerable expertise as ...
(Date:4/5/2017)... -- The Allen Institute for Cell Science today announces the ... and dynamic digital window into the human cell. The ... of deep learning to create predictive models of cell ... growing suite of powerful tools. The Allen Cell Explorer ... available resources created and shared by the Allen Institute ...
Breaking Biology News(10 mins):