Princeton University

School of Engineering & Applied Science

Super Energy Efficient Straintronics-spintronics: Clocking Magnetostrictive Nanomagnets with Strain

Prof. Jayasimha Atulasimha
EQuad B205
Friday, September 5, 2014 - 3:00pm

This talk will start with a brief introduction on magnetostrictive materials. Thereafter, our group’s current research in the newly emerging area of multiferroic nanomagnet based ultra low power computing will be discussed. Specifically, we show in collaboration with Prof. Bandyopadhyay's group that multiferroic nanomagnets (consisting of a piezoelectric and a magnetostrictive layer) can be used to perform computing while dissipating 3 orders of magnitude less energy than current transistors at clock rates of ~1GHz acting as memory elements, logic wires, gates and associative memory for higher order computing such as ultrafast image reconstruction and pattern recognition.
We have recently implemented strain clocked nanomagnetic logic and information propagation in a nanomagnetic array experimentally using elliptical magnetostrictive nanomagnets of nominal lateral dimensions ~ 100 nm and thickness ~10 nm that have been fabricated by e-beam lithography on piezoelectric substrates. Simulations to model the switching error in such dipole coupled nanomagnetic systems and new schemes to mitigate such errors will also be presented. Finally, magnetic tunnel junction based multiferroic nanomagnetic architectures that could lead to practical ultra-low-power memory, digital and analog computing paradigms will be discussed.
Jayasimha Atulasimha is a Qimonda Associate Professor of Mechanical and Nuclear Engineering with a courtesy appointment in Electrical and Computer Engineering at the Virginia Commonwealth University. He has authored or coauthored more than 50 scientific articles including more than 30 journal publications on magnetostrictive materials, magnetization dynamics, and nanomagnetic computing. His research interests include nanomagnetism, spintronics, magnetostrictive materials and multiferroic nanomagnet-based computing. He received the NSF CAREER Award for 2013–2018. He is a member of ASME, APS and an IEEE Senior Member. He currently serves on the Technical Committees for Spintronics, IEEE Nanotechnology Council, ASME Adaptive Structures and Material Systems, Device Research Conference (DRC), and as a Focus Topic organizer on Magnetic Nanostructures for the APS topical group on magnetism (GMAG).