Farzad Mahfouzi

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Three-dimensional (3D) topological insulators are known for their strong spin-orbit coupling (SOC) and the existence of spin-textured surface states that might be potentially exploited for "topological spintronics." Here, we use spin pumping and the inverse spin Hall effect to demonstrate successful spin injection at room temperature from a metallic(More)
We study heterostructures where a two-dimensional topological insulator TI is attached to two normalmetal NM electrodes while an island of a ferromagnetic insulator FI with precessing magnetization covers a portion of its lateral edges to induce time-dependent exchange field underneath via the magnetic proximity effect. When the FI island covers both(More)
We predict an unconventional spin-transfer torque (STT) acting on the magnetization of a free ferromagnetic (F) layer within N/TI/F vertical heterostructures, which originates from strong spin-orbit coupling on the surface of a three-dimensional topological insulator (TI), as well as from charge current becoming spin polarized in the direction of transport(More)
Farzad Mahfouzi,1 Jaroslav Fabian,2 Naoto Nagaosa,3,4 and Branislav K. Nikolić1,3,* 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2570, USA 2Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany 3Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group(More)
We study theoretically the current-voltage characteristics of intrinsic Josephson junctions in high-Tc superconductors. An oscillation of the breakpoint current on the outermost branch as a function of coupling alpha and dissipation beta parameters is found. We explain this oscillation as a result of the creation of longitudinal plasma waves at the(More)
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