John Unguris

John Unguris is a Project Leader in the Electron Physics Research Group in the CNST. He received a B.S. in Physics from Carnegie Mellon University, and a Ph.D. in Physics from the University of Wisconsin. John initially joined NIST as a NRC Postdoctoral Research Associate investigating the application of electron spin measurements to various surface sensitive spectroscopies. Since then his research at NIST has focused on the development of techniques to measure the properties of magnetic nanostructures; in particular, spin sensitive electron microscopy. John has over 100 publications, is a frequent invited speaker at international meetings, and has helped organize numerous workshops and conferences on magnetism. He is a Fellow of the American Physical Society, a co-recipient of the APS Keithley Award, and has been awarded a Bronze Medal from the Department of Commerce. John currently leads multiple projects investigating the fundamental physics of magnetic nanostructures.

Selected Programs/Projects

• Nanomagnetic Imaging
• Nanomagnet Dynamics

Selected Publications

• Size Dependent Transition from Shape to Exchange Dominated Magnetic Nanostructures in Patterned Zigzags, W. C. Uhlig and J. Unguris, Journal of Applied Physics 99(8), 08G302 (2006).
• Direct Observation of Spin Configurations and Classification of Switching Processes in Mesoscopic Ferromagnetic Rings, M. Kläui, C.A.F. Vaz, J.A.C. Bland, T.L. Monchesky, J. Unguris, L.J. Heyderman, and Z. Cui, Physical Review B 68(13), 134426 (2003).
• Scanning Electron Microscopy with Polarization Analysis (SEMPA) and its Applications, J. Unguris, Magnetic Imaging and Its Applications to Materials, eds. M. de Graef and Y. Zhu, Burlington, MA:Academic Press,167-303, (2000).
• Observation of Two Different Oscillation Periods in the Exchange Coupling of Fe/Cr/Fe(100), J. Unguris, R.J. Celotta, and D.T. Pierce, Physical Review Letters 67(1), 140-143 (1991).
• Micromagnetics of Domain Walls At Surfaces, M.R. Scheinfein, J. Unguris, J.L. Blue, K.J. Coakley, D.T. Pierce, R.J. Celotta, and P.J. Ryan, Physical Review B 43(4), 3395-3422 (1991).
• Spin and Energy Analyzed Secondary Electron Emission from a Ferromagnet, J. Unguris, D.T. Pierce, A. Galejs, and R.J. Celotta, Physical Review Letters 49(1), 72-76 (1982).