Simranjeet Singh is a post-doctoral researcher in Prof. Chris Hammel’s research group. His research focuses on studying magnetism, spin transport and spin dynamics in low dimensional materials. He is excited about learning and using the local magnetic resonance scanning probes to investigate the magnetism (intrinsic or extrinsically induced) and spin dynamics in mesoscopic sized, atomically thin sheets of low dimensional materials. He is always fascinated by the physics arising from the interactions of electron spins and magnetically ordered materials.
He earned his PhD in Physics from University of Central Florida in December 2014. His thesis studies, under the supervision of Prof. Enrique del Barco, investigated dynamical spin injection into graphene (also other 2D systems) employing broad band FMR techniques. He also worked on spin pumping, spin-charge interconversion in ferromagnet/metal bilayer systems and developed Single Electron Transistors for studying nanometer sized individual molecular magnets. As a graduate student he got training in: experimental techniques for low temperature physics, magnetism at nano-scale, spin dynamics, device physics (SETs), electrical transport of atomically thin materials.
After completing his PhD, he moved to Prof. Roland Kawakami’s lab (Jan2015-Aug2016) as a post-doc, where he led the efforts to investigate magnetic proximity effects in graphene/ferromagnet interfaces and demonstrated presence of strong magnetic exchange coupling in graphene by studying the interaction of spins in graphene with magnetization of nearby ferromagnetic material. He also developed and setup techniques in the lab to mechanically assemble mesoscopic sized, atomically clean 2D heterostructures, e.g. integration of crystalline h-BN tunnel barriers on graphene, graphene encapsulated by h-BN, for high quality spin injection/transport in graphene. His efforts in this direction lead to the experimental realization of spin relaxation times exceeding a nanosecond (at RT) in graphene supported on conventional oxide substrates. Apart from this, he has also developed a smooth, robust and pinhole free metal oxide tunnel barrier material for spin injection into graphene. His work lead to observation of giant spin accumulations in graphene at room temperature, which is a stepping stone for realizing the spin-toque switching of a magnet using graphene spin currents.