title: Inverse spin Hall effect from pulsed spin current in organic semiconductors with tunable spin-orbit coupling.
abstract: Exploration of spin currents in organic semiconductors (OSECs) induced by resonant microwave absorption in ferromagnetic substrates is appealing for potential spintronics applications. Owing to the inherently weak spin-orbit coupling (SOC) of OSECs, their inverse spin Hall effect (ISHE) response is very subtle; limited by the microwave power applicable under continuous-wave (cw) excitation. Here we introduce a novel approach for generating significant ISHE signals in OSECs using pulsed ferromagnetic resonance, where the ISHE is two to three orders of magnitude larger compared to cw excitation. This strong ISHE enables us to investigate a variety of OSECs ranging from π-conjugated polymers with strong SOC that contain intrachain platinum atoms, to weak SOC polymers, to C60 films, where the SOC is predominantly caused by the curvature of the molecule's surface. The pulsed-ISHE technique offers a robust route for efficient injection and detection schemes of spin currents at room temperature, and paves the way for spin orbitronics in plastic materials.
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Dali
authors.initials: D
authors.lastname: Sun
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Kipp J
authors.initials: KJ
authors.lastname: van Schooten
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Kavand
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Hans
authors.initials: H
authors.lastname: Malissa
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Chuang
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Groesbeck
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Christoph
authors.initials: C
authors.lastname: Boehme
authors.affiliation: Department of Physics &Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Valy Vardeny
mesh_terms: D008567:Membranes, Artificial; D008872:Microwaves; D012666:Semiconductors; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial