Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Focus Session "Spin Currents in Magnetic Nanostructures", Organization: Mathias Kläui (Univ. Mainz)

MA 30.9: Talk

Wednesday, March 28, 2012, 18:15–18:30, EB 301

Direct detection of magnon spin transport by the inverse spin Hall effect — •Andrii Chumak, Benjamin Jungfleisch, Alexander Serga, Roland Neb, and Burkard Hillebrands — Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany

The combination of the spin pumping effect with the inverse spin Hall effect (ISHE) allows the use of spin waves (or magnons) for the carrying of signals in spintronic devices. In spite of sufficient progress in these studies, no magnon-carried spin transfer has yet been shown directly. We use a spatially separated inductive spin-wave source and an ISHE detector to demonstrate the signal transport by travelling magnons in a time resolved experiment. The setup comprises a 2.1 µm thick YIG waveguide with a 10 nm thick (200 µm x 3 mm) Pt strip deposited on the top. The YIG waveguide is magnetized along its long axis by applying an external bias magnetic field of 1754 Oe. In order to excite short spin-waves packets the 50 µm wide Cu microstrip antenna is placed at a distance of 3 mm from the Pt strip. While propagating under the Pt layer, the spin-wave packet generates a spin current in it due to spin pumping, and the delayed ISHE DC pulse is detected. The delay appears due to the finite spin-wave group velocity and proves the magnon nature of the spin transport. The experiment suggests to utiliza spin waves for the transfer of spin information over macroscopic distances in spintronic devices and circuits. Besides, the contribution of secondary excited magnons to the ISHE voltage is refered in our studies.