We created of localized electron vortex states by magnetic monopole excitations in artificial spin ices.
Significance and Impact
Creation and manipulation structured quantum electron waves will enable novel imaging and quantum scattering experiments, in particular for exploring chiral materials
- The artificial spin ice lattice consisted of closely-spaced CoFe islands (size 2 µm X 160 nm and thickness 25 nm).
- Using Lorentz TEM we showed the presence of localized electron vortex states carrying orbital angular momentum imprinted into electron waves at the location of magnetic monopole excitation.
- Using off-axis holography, we showed a direct correspondence between the magnitude and sign of the magnetic charge of the monopole excitation, and the orbital angular momentum imparted to the electron beam.
Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.
The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.