Exchange biased magnetic vortices
Ferromagnet/antiferromagnet exchange biased nanostructures have critical applications in spin-valve type of spintronic devices which enable nanoscale control of magnetic configurations. There has been a long standing issue on whether the macroscopic exchange bias conventionally determined from the major loop is uniform across the entire sample or just a reflection of the weakest point. Researchers led by Prof. Kai Liu at the University of California – Davis have shed new light on this missing link in a study of exchange biased nanodots whose sizes are chosen to be near the boundary of single domain (SD) and vortex state (VS) reversal modes. The major loop exchange bias is deconvoluted into weighted averages of local bias separately experienced by SD and VS dots, and the relative fraction of such dots are found to be modified by exchange bias. Furthermore, the VS nucleation and annihilation fields exhibit unequal shifts caused by the exchange bias, which provide first experimental demonstration of local, incomplete domain walls and tilted vortex cores in such exchange biased nanostructures. The work was supported by the US NSF (Grant No. DMR-1008791 and No. ECCS-0925626), the AFOSR (Grant No. FA9550-10-1-0409), and the Texas A&M University-CONACyT collaborative research program.
Previous Story: NREL Nano-Technology Solar Cell Achieves 18.2% Efficiency
Next Story: The Future of Conductive Printing
The Institute of Nanotechnology puts significant effort into ensuring that the information provided on its news pages is accurate and up-to-date. However, we cannot guarantee absolute accuracy. Consequently, the Institute of Nanotechnology disclaims any and all responsibility for inaccuracy, omission or any kind of deficiency in relation to the news items and articles hosted herein.
- 25 November 2013Nanomedical Device and Systems Design: Challenges, Possibilities, Visions
- 01 November 2013NanoSafety Cluster Launches its first newsletter
- 14 October 2013Developing EU–Latin America Nanotech Cooperation - the NMP–DeLA project kicks off
- 24 September 2013Should We Use Nanotechnology to Feed Ourselves?
- 18 September 2013UCLA researchers' smartphone 'microscope' can detect a single virus, nanoparticles
- View All