Adjunct Professor
PhD Physics, Case Western Reserve University, 1985
MS Physics, Case Western Reserve University, 1985
MSc Engineering Physics, Uppsala University, Sweden, 1982
Materials Scientist, Group Leader
Argonne National Laboratory, Materials Science Division
After receiving his Ph.D. in Physics (condensed matter theory), Heinonen worked as a post-doc with Walter Kohn at the University of California, Santa Barbara from 1985 to 1987, and also as a post-doc with Philip Taylor at Case Western Reserve University 1987 – 1989. In 1989 he joined the faculty at the Department of Physics, University of Central Florida, where he remained for nine years, after which he went to Seagate Technology in Minneapolis, MN. He joined Argonne in July of 2010. He has been active in the magnetic societies of IEEE and APS and served in various capacities on program committees for the Magnetism and Magnetic Materials and Intermag conferences and is presently a member of the Executive Committee of the Topical Group on Magnetism and its Applications (GMAG) of the American Physical Society. He has published over 60 articles, co-authored to books and holds twelve US Patents. His research interests include magnetization structures and dynamics in magnetic nanostructures, transport in oxide nanostructures, and electronic structure.
The behavior of magnetization in nanoscale structures is a
rich field with important applications in information storage. In these
systems, the interactions between different layers as well as between different
structures in patterned arrays can be tuned. This leads to an
interplay between interactions, resulting in complex static and dynamic
magnetization behavior. Furthermore, charge currents in non-collinear magnetic
structure can couple to magnetization dynamics through spin torque, leading to
complex dynamical behavior, including GHz nano-scale
oscillators. My research in this area is aimed at understanding how behavior
arises and can be controlled by tailoring interactions and structures. I do
this research in collaboration with experimental groups at Argonne National
Laboratory, at Northwestern University, and at University of Gothenburg
(Sweden).
Selected Publications
- Bias dependence of perpendicular spin torque and of free and fixed layer eigenmodes in MgO-based nanopillars, P.K. Muduli, O. Heinonen, and J. Åkerman, P. K. Muduli, O. G. Heinonen, and Johan Åkerman, Phys. Rev. B 83, 184410 (2011)
- Nanoscale structure of the magnetic induction at monopole defects in artificial spin-ice lattices, C. Phatak, A. K. Petford-Long, O. Heinonen, M. Tanase, and M. De Graef, Phys. Rev. B 83, 174431 (2011)
- Perpendicular Spin Torque in Magnetic Tunnel Junctions, O. G. Heinonen, S. W. Stokes, and J. Y. Yi, Phys. Rev. Lett. 105, 066602 (2010)
- Magnetization reversal in circularly exchange-biased ferromagnetic disks, M. Tanase, A. K. Petford-Long, O. Heinonen, K. S. Buchanan, J. Sort, and J. Nogués, Phys. Rev. B 79, 014436 (2009)
- Giant Magnetic Anisotropy in Tetragonal FeCo Alloys, Till Burkert, Lars Nordström, Olle Eriksson, and Olle Heinonen, Phys. Rev. Lett. 93, 027203 (2004)
- A Quantum Approach to Condensed Matter, Philip L. Taylor and O. Heinonen (Cambridge University Press, 2002)
- Many-Particle Theory, E.K.U. Gross. E. Runge and O. Heinonen, (433 pages, IOP Publishing, Bristol, 1991)
