- About Us
- Career Center
- Nano-Social Network
- Nano Consulting
- My Account
|Preparing samples for study at the NSLS.|
Complex oxide materials are intriguing because their properties span an enormous range of distinct physical states, including conductors, insulators, superconductors, ferromagnets, anti-ferromagnets, ferro-electrics, piezo electrics, and multiferroics. Part of the attraction of these materials is that their properties can be modified by introducing a mixed valence state — that is, a composition that includes metal ions with more than one oxidation state.
Scientists from DOE's Brookhaven and Lawrence Berkeley National Laboratories, SLAC National Accelerator Center, and collaborators at the University of California, Berkeley, and the Science and Technology Facilities Council of the UK are taking a closer look at one such material with a particular composition of lanthanum strontium and magnesium oxide.
La0.7Sr0.3MnO3 (LSMO) is a mixed-valence, complex oxide (containing a mix of Mn3+ and Mn4+ ions) whose properties have been examined extensively. LSMO is thought to be a simple metallic ferromagnet and it has been used in prototype, thin-film electrical devices (such as magneto-resistance junctions) that seek to exploit the many intriguing properties of complex oxides for new applications.
To further explore LSMO, the scientists grew single-layer films with a variable number of unit cells epitaxially on strontium titanate (STO). Using a combination of x-ray magnetic circular dichroism, x-ray absorption spectroscopy, and x-ray reflectivity measurements at Brookhaven's National Synchrotron Light Source (NSLS), the scientists discovered that, due to doping instabilities and/or charge transfer at the interface, an intermediate enriched Mn3+ layer of a few unit cells develops at the LSMO/STO interface. The presence of this intermediate layer may provide a mechanism for antiferromagnetic coupling across the interface — which, in turn, may lead to the reversed magnetic configuration observed in thicker LSMO films.
The findings demonstrate the rich variety of interfacial spin couplings that can occur in complex oxide thin films that may be utilized in engineering thin-film devices. This work was partially supported by the Semiconductor Research Corporation's NRI-WIN program.
About Brookhaven National Laboratory
One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE’s Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.
For more information, please click here
Karen McNulty Walsh
Copyright © Brookhaven National LaboratoryIf 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.
|Related News Press|
News and information
Nanospiked bacteria are the brightest hard X-ray emitters July 2nd, 2015
Healthcare Nanotechnology (Nanomedicine) Market Size To 2020 June 5th, 2015
Exagan Raises €5.7 Million to Produce High-efficiency GaN-on-Silicon Power-switching Devices on 200mm Wafers: Leti-and-Soitec Spinout Focused on Becoming Leading European Source Of GaN Devices for Solar, Automotive, Telecoms and Infrastructure June 25th, 2015
Nanowires could be the LEDs of the future June 25th, 2015
Leti to Present Solutions to New Applications Using 3D Technologies at SEMICON West LetiDay Event, July 14: Leti Experts also Will Speak at TechXPOT Session on MEMS and STS Session on Lithography Cost-and-Productivity Issues Below 14nm June 22nd, 2015