Navigation Links
Magnetic nanoswitch for thermoelectric voltages
Date:10/24/2011

This press release is available in German.

The heat which occurs in tiny computer processors might soon be no longer useless or even a problem. On the contrary: It could be used to switch these processors more easily or to store data more efficiently! These are two of the several potential applications made possible by a discovery made at the Physikalisch-Technische Bundesanstalt (PTB). This so-called "thermoelectric voltage" may well be very interesting mainly for the use of nano-junctions, i.e. small components based on magnetic tunnel structures. The results obtained by the researchers have been published in the current issue of the renowned specialised journal Physical Review Letters.

Today, magnetic tunnel structures already occur in various areas of information technology. They are used, for example, as magnetic storage cells in non-volatile magnetic memory chips (the so-called "MRAMs" Magnetic Random Access Memories) or as highly sensitive magnetic sensors to read out the data stored on hard disks. The new effect discovered at PTB within the scope of a research collaboration with Bielefeld University and the Singulus company could, in the future, add a new application to the existing ones: monitoring and controlling thermoelectric voltages and currents in highly integrated electronic circuits.

Magnetic tunnel structures consist of two magnetic layers separated only by a thin insulation layer of approx. 1 nm the so-called "tunnel barrier". The magnetic orientation of the two layers inside the tunnel structure has a great influence on its electrical properties: if the magnetic moments of the two layers are parallel to each other, the resistance is low; if, on the contrary, they are opposed to each other, the resistance is high. The change in the resistance when switching the magnetisation can amount to more than 100 %. It is therefore possible to control the electric current flowing through the magnetic tunnel structure efficiently by simply switching the magnetisation.

The work carried out by the PTB researchers now shows that, besides the electric current, also the thermal current flowing through the tunnel structure can be influenced by switching the magnetisation. In their experiments, the scientists generated a temperature difference between the two magnetic layers and investigated the electric voltage (the so-called "thermoelectric voltage") generated hereby. It turned out that the thermoelectric voltage depends on the magnetic orientation of the two layers nearly as strongly as the electric resistance. By switching the magnetisation, it is therefore possible to control the thermoelectric voltage and, ultimately, also the thermal current flowing through the specimen.

In future, this new effect could be applied, for example, by using and converting the energy of waste heat occurring in integrated circuits in a targeted way. Furthermore, the discovery of this so-called "tunnel magneto thermoelectric voltage" is a milestone in the research field "spin calorics" a field developing at a fast pace which is currently promoted by the Deutsche Forschungsgemeinschaft (DFG) within the scope of a large-scale, 6-year priority programme.


'/>"/>
Contact: Dr. Hans Werner Schumacher
hans.w.schumacher@ptb.de
49-053-159-22500
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert  

Related biology technology :

1. New Publications Show Noninvasive Magnetic Resonance-Guided Focused Ultrasound to be a Potentially Safe, Effective Pain-Relieving Treatment for Bone Metastases
2. Stereotaxis Showcases Advancements for Remote Magnetic Ablations
3. Capture of nanomagnetic fingerprints a boost for next-generation information storage media
4. Nanophysicists find unexpected magnetic effect
5. Unexpectedly long-range effects in advanced magnetic devices
6. Researchers design new graphene-based, nano-material with magnetic properties
7. Researchers design new graphene-based, nanomaterial with magnetic properties
8. Magnetic mixing creates quite a stir
9. Using magnetic toys as inspiration, researchers tease out structures of self-assembled clusters
10. Brown physicist discovers odd, fluctuating magnetic waves
11. Magnetic fields drive drug-loaded nanoparticles to reduce blood vessel blockages in an animal study
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Magnetic nanoswitch for thermoelectric voltages
(Date:12/2/2016)... DUBLIN , Dec 2, 2016 ... new report "Nanobiotechnology Applications, Markets and Companies" to ... , ... of nanobiotechnology by the pharmaceutical and biotechnology industries is anticipated. ... - from formulations for optimal delivery to diagnostic applications in ...
(Date:12/2/2016)... ... , ... Aerocom Healthcare ( http://www.aerocomhealthcare.com ), representing the global ... solution for tracking and securing medications at booth 676 at the ASHP Midyear ... has a proven solution for tracking medications via its system from pharmacy to ...
(Date:12/2/2016)... OF PRUSSIA, PA (PRWEB) , ... December 01, 2016 , ... ... research is through industry-wide collaboration, standardization and a beautiful technology experience. All three tenets ... convened more than 100 clinical trial leaders from over 40 sponsor, CRO and site ...
(Date:12/2/2016)... ... 2016 , ... Robots will storm the Prudential Center in Boston, MA during ... which is held on the United Nations International Day of Persons with Disabilities, will ... workplace. Suitable Technologies is partnering with NTI to showcase how technology can help individuals ...
Breaking Biology Technology:
(Date:11/30/2016)... and WARSAW, Poland , Nov. 30, 2016 ... is one of the most crucial aspects of recovery so we need to do ... serious health risks, including heart problems, high blood pressure, stroke, diabetes, and even cancer. ... friends sleep and find a Christmas present that could help them to manage their ... ...
(Date:11/29/2016)... , Nov. 29, 2016 BioDirection, a privately ... products for the objective detection of concussion and other ... has successfully completed a meeting with the U.S. Food ... blood test Pre-Submission Package. During the meeting company representatives ... as a precursor to commencement of a planned pilot ...
(Date:11/29/2016)... Nearly one billion matches per second with DERMALOG,s ... ... DERMALOG is Germany's largest Multi-Biometric ... Management. (PRNewsFoto/DERMALOG Identification Systems) ... DERMALOG is Germany's largest Multi-Biometric supplier: The company's Fingerprint Identification System is ...
Breaking Biology News(10 mins):