In the recent past, motivated by lowering dissipation in information processing devices, the quest for electrical control of magnetic order has resulted in a number of important fundamental discoveries, opening a field dubbed spintronics. More recently, in this regard, the ability to engineer relativistic spin-orbit interaction (SOI) in magnetic system has provided a completely new method to control magnetic order beyond traditional spintronics; similarly resulting in a field now referred to as spin-orbitronics. In this talk I will present this spin-orbitronic control of various magnetic systems interfaced with heavy elements, which provide the required SOI. First, electrical current-induced switching of magnetization will be presented in magnetically-doped topological insulators . Topological insulators are a new state of matter harboring spin-polarized conduction at its surface, owing its existence to the presence of high SOI. We find that this SOI results in transfer of angular momentum to the magnets applying so-called spin-orbit torques (SOT), which are nearly three orders of magnitude larger than any other system. Next, the first room temperature demonstration of spin-orbit-induced creation and motion of topological solitons, called skyrmions, will be presented . These skyrmions have been recently proposed as ideal candidates for information carriers in magnetic devices, motivated by which, I will then present a strategy to control skyrmions via electric-field-induced SOT . Uniquely, SOT can be applied even on insulating magnets, which can then be used to excite and transport information via collective excitations of magnets. In this regard, I will then discuss the possibility of excitation of a spin-superfluid mode in magnets at room temperature. This spin-superfluid mode provides a method to transfer angular momentum in a nearly dissipationless fashion, which I will demonstrate in a specific model of superfluid-induced soliton motion . Equally importantly, insulators can be excited via thermal spin torques in the absence of any flow of charge current, hence removing all current-induced dissipation. I will propose a scheme for using these thermal torques for initiating superfluid-induced domain-wall motion . Finally, I will conclude by presenting first direct evidence of these novel thermomagnonic torques via using single quantum spins in NV centers as a probe , which opens up possibilities for quantum spintronic applications.  Y. Fan, P.U., Y. Tserkovnyak, K. Wang et al Nature Mat. 13 699 (2014)  W. Jiang, P.U., Y. Tserkovnyak, K. Wang et al Science 349, 6245 (2015)  P.U., K. Wang et al Phys. Rev. B 92, 134411 (2015)  P.U., S. Kim and Y. Tserkovnyak Phys. Rev. Lett (accepted)  B. Flebus, P.U., R. Duine and Y. Tserkovnyak Phys. Rev. B (in press)  C.H. Du, P.U., Y. Tserkovnyak, A. Yacoby et al arXiv: 1611.07408 (submitted Science)
Pramey Upadhyaya received the B.Tech. degree in electrical engineering from the Indian Institute of Technology, Kharagpur, India, in 2009 and the Ph.D. degree in electrical engineering department from the University of California, Los Angeles, USA, in 2015. His Ph.D. dissertation concerned electrical control of magnetic order via spin-orbit interaction. His Ph.D. work was recognized and supported by Qualcomm innovation and Intel summer research fellowship. In 2015, he joined the physics department, UCLA, Los Angeles, CA, as a postdoctoral researcher, where his work include exploration of classical and quantum spintronic phenomenon and devices enabled by electrical and thermal control of magnetism.