Navigation Links
University of Illinois study advances limits for ultrafast nano-devices
Date:7/10/2014

A recent study by researchers at the University of Illinois at Urbana-Champaign provides new insights on the physical mechanisms governing the interplay of spin and heat at the nanoscale, and addresses the fundamental limits of ultrafast spintronic devices for data storage and information processing.

"Electrons carry a charge as well as spin-angular momentum. In a typical charge current, electrons' spin-angular-momentum is random so there is no spin current," explained David Cahill, a professor of materials science and engineering at Illinois. "However when electrons move with a partial alignment of spin-angular-momentum, we call it spin current which is the key element for nanoscale spintronic devices.

"It is understood that spin current can rotate magnetization. In other words, we can use spin current to select "0" or "1" state of magnetic memory devices. For ultrafast operation of such nano-devices, generation of spin current in picosecondsone trillionth of a seconda time-scale that is difficult to achieve using electrical circuits, is highly desired," Cahill added.

"In a typical electrical circuit approach, spin current is driven by voltage difference across the structure. In this work, we utilized differences in temperature to generate spin currents," explained Gyung-Min Choi, lead author of the paper, "Spin current generated by thermally-driven ultrafast demagnetization," published in Nature Communications.

"A metallic ferromagnet has three energy reservoirs: electrons, magnons, and phonons," Choi stated. "Using ultra-short laser light, we created temperature differences between these reservoirs of thermal energy for a few picoseconds. The temperature difference between electron and magnon drives an exchange of spin-angular-momentum.

"Thus, we transport spin-angular-momentum from magnons to electrons, and this transport leads to ultrafast spin current," Choi added. "We refer to this spin current as thermally-driven and believe that our results extend the emerging discipline of spin caloritronics into the regime of picosecond time scales.

The benefits of thermal generation over electric generation are two-fold, according to Choi.

"Thermal spin generation has a potential for higher efficiency than spin generation by electrical currents. Our work shows that thermal spin current can be large enough to rotate magnetization. Although the amount of spin current is still smaller than what would be required for practical applications, we show the potential of thermal generation.

"The second advantage is the fast timescale. The time scale of spin currents generated by electrical currents is limited to a few nanoseconds. In this work, we are able to create spin current with timescale of a few picoseconds. Picosecond generation of spin current is desirable for fast operation of magnetic memory devices."


'/>"/>

Contact: David G. Cahill
d-cahill@illinois.edu
217-333-6753
University of Illinois College of Engineering
Source:Eurekalert  

Related biology technology :

1. Arizona State University engineers aim to improve performance of technology in extreme environments
2. BioRestorative Therapies Signs Material Manufacturing Agreement With University of Utah
3. Causes of Gulf War Illness are complex and vary by deployment area -- Baylor University study
4. HistoRx Licenses Melanoma Assay from Yale University
5. Epitomics, Inc. and University of California, Davis, Complete Star Program for High-Throughput Measurement of Antibody-Antigen Interactions
6. Boulder Diagnostics Licenses Novel Rapid Detection Technology for Homocysteine and Related Compounds from Portland State University
7. Research at Rice University leads to nanotube-based device for communication, security, sensing
8. EUR 1.0 Million Grant Awarded to Exosome Diagnostics and Ludwig Maximilian University from German Federal Ministry for Education and Research to Develop Biofluid-Derived Exosome Diagnostics
9. Valkee and University of Oulu Publish the First Clinical Trial on Bright Light Therapy Channeled via ear Canals in Seasonal Depression
10. Oxitec Responds to University of Panamas Forum on Transgenic Mosquitoes
11. Intellect Neurosciences Enters Collaboration Agreement with Leading Alzheimers Research Group at University of California Irvine to Test First in Class Dual Target Vaccine
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
University of Illinois study advances limits for ultrafast nano-devices
(Date:4/19/2017)... ... April 18, 2017 , ... A number of new instruments have recently emerged ... of the Protein and Cell Analysis Education Webinar Series , will focus on ... in current and future applications. , Many flow cytometers have unique capabilities and ...
(Date:4/19/2017)... Waltham, MA (PRWEB) , ... April 19, 2017 ... ... of a $1.5M Series A-1 financing round. This event adds to several other ... establishment of its’ Executive and Scientific Teams. , ThermaGenix will use ...
(Date:4/19/2017)... 2017  As a Bronze Sponsor of ... ,  Proove® Biosciences, Inc. announces the first-ever ... lifestyle factors to accurately predict prescription opioid abuse. In ... California (USC), the Interventional Pain Institute in ... showing that Proove Opioid Risk® accurately identifies patients ...
(Date:4/18/2017)... ... April 18, 2017 , ... METTLER TOLEDO Process ... concentration levels and vice-versa. , One of the key applications for the measurement ... control or monitoring. The principle of this analytical method is based on pure ...
Breaking Biology Technology:
(Date:4/11/2017)... , April 11, 2017 Crossmatch®, ... secure authentication solutions, today announced that it has ... Advanced Research Projects Activity (IARPA) to develop next-generation ... program. "Innovation has been a driving ... Thor program will allow us to innovate and ...
(Date:4/11/2017)... MELBOURNE, Florida , April 11, 2017 ... "Company"), a security technology company, announces the appointment of independent ... John Bendheim to its Board of Directors, furthering the ... ... behalf of NXT-ID, we look forward to their guidance and ...
(Date:4/5/2017)... Today HYPR Corp. , leading innovator ... of the HYPR platform is officially FIDO® Certified ... architecture that empowers biometric authentication across Fortune 500 enterprises ... over 15 million users across the financial services industry, ... product suites and physical access represent a growing portion ...
Breaking Biology News(10 mins):