November 3, 2013 at 9:30 pm

Smith Gives Invited Talk at International Conference in Japan

Dr. Arthur Smith, Professor of Physics and Astronomy, presents an invited talk Nov. 8 in Tsukuba, Japan, at the 12th International Conference on Atomically Controlled Surfaces, Interfaces, and Nanostructures, in conjunction with the 21st International Colloquium on Scanning Probe Microscopy.

Dr. Arthur Smith

Dr. Arthur Smith

Smith will discuss “Spin-polarized scanning tunneling microscopy of complex magnetic systems grown by molecular beam epitaxy.”

“We apply scanning tunneling microscopy with spin polarization to investigate ultra-thin films of complex magnetic systems grown using molecular beam epitaxy,” he writes in the abstract with co-authors Andrada Mandru, Kangkang Wang, and Jeongihm Pak.

Figure: 100×100 nm2 STM image of Fe nanoislands on Mn3N2(001) nanopyramids.

Figure: 100×100 nm2 STM image of Fe nanoislands on Mn3N2(001) nanopyramids.

“Systems of interest currently include Fe on manganese nitride and MnGa on gallium nitride. Magnetically-sensitive probes consist of W tips coated with thin Fe layers. In all cases, the freshly deposited sample is transferred through ultra-high vacuum directly into the adjoining SP-STM system. In the case of Mn3N2(001), an unusual orthogonal magnetic anisotropy is found on every 3rd atomic terrace; then, very low coverage of Fe results in an array of 1-atom-high, several nm-wide Fe islands decorating the terraces. Conductance mapping is applied to investigate the electronic & magnetic properties on different neighboring terraces.:”

Smith and Wang were on the cover of Nano Letters with their article “Three-Dimensional Spin Mapping of Antiferromagnetic Nanopyramids Having Spatially Alternating Surface Anisotropy at Room Temperature” in January 2012.

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