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CAMP Seminar: Generation and Detection of Spin Currents by Ferromagnetic Resonance Driving Spin Pumping

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Hailong Wang, The Pennsylvania State University
When
27 September 2016 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
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The development of next-generation spintronic devices has driven extensive studies of spin-charge conversion through measurements of the inverse spin Hall effect (ISHE) and/or the inverse Rashba–Edelstein effect (IREE) in both three-dimensional and two-dimensional material systems. Built on the high-quality Y3Fe5O12 (YIG) films, we use ferromagnetic resonance (FMR) spin pumping technique to characterize the spin Hall angles for a number of 3d, 4d, and 5d nonmagnetic metals with widely varying spin-orbit coupling strengths and demonstrate that both atomic number and d-electron count play important roles in spin Hall physics. I will also describe our recent experimental observation of robust spin pumping signals in three-dimensional topological insulators (TIs) due to the expected large spin-orbit coupling strength in the bulk states and the inherent spin-momentum “locking” in their surface states which promise very efficient spin-charge conversion efficiency.

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