IEEE Magnetics Society
Santa
Clara Valley Chapter
Tuesday, October 4, 2016
Western Digital, 1710
Automation Parkway, San Jose, CA 95131
Directions
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Cookies, Conversation
& Pizza at 6:30 P.M.
Presentation at 7:00 P.M.
Beyond Moore's Law: Magnetic Skyrmions and Magneto-Ionics
Kai Liu, University of California, Davis, CA
Abstract
The end of Moore's law marks a new era in the high-technology industry and underscores the urgency of developing highly energy efficient nanoelectronics. Spintronics offers an exciting new paradigm to address this grand challenge. For example, in recently discovered magnetic skyrmions, mostly at low temperatures, the unique spin texture leads to a host of fascinating phenomena due to the topologically protected quantum state, offering great potential for low dissipation magnetic information storage. We have recently demonstrated the realization of room temperature artificial Bloch skyrmion lattices over extended areas in their ground state by patterning asymmetric magnetic nanodots with controlled circularity on a PMA underlayer [1]. Another promising route to achieving highly energy-efficient spintronic devices is magneto-ionic control of metal/oxide heterostructures. We have demonstrated effective magneto-ionic manipulation of GdFe/NiCoO interfaces due to a redox-driven oxygen migration, manifested through the interface-sensitive exchange bias effect [2]. These results show promising new approaches towards future spin-based nanoelectronics. Time permitting, I will discuss an extremely sensitive magnetic yoking effect and tunable interactions in FePt based hard/soft bilayers which are prototype heat-assisted magnetic recording (HAMR) media [3].
This work has been supported by the NSF (DMR-1008791, ECCS-1232275, and DMR-1543582), BaCaTec (A4 [2012-2]), and the France-Berkeley Fund.
1. D. A. Gilbert, et al, Nature Commun. 6, 8462, (2015).
2. D. A. Gilbert, et al, Nature Commun. 7, 11050 (2016).
3. D. A. Gilbert, et al, Sci. Rep. 6, 32842 (2016).
Biography
Prof. Kai Liu received his Ph.D. in Physics from the Johns Hopkins University in 1998. He then carried out postdoctoral research at the University of California - San Diego. He joined the University of California - Davis faculty in 2001, where he was promoted to Associate Professor in 2005 and Professor in 2008. His research interest is in experimental studies of magnetism and spin transport in nanostructured materials. He was recipient of an Alfred P. Sloan Research Fellowship (2005) and a UC Davis Chancellor's Fellowship (2007). He is also elected Fellow of the Institute of Physics (UK, 2011), American Physical Society (2012) and IEEE (2016). He is the General Chair for the 61st Annual Conference on Magnetism and Magnetic Materials (2016 MMM), and the US representative to the International Union of Pure and Applied Physics (IUPAP) Commission on Magnetism (2015-2017).
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