Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Focus Session: Spin Current Devices

MA 32.3: Topical Talk

Donnerstag, 14. März 2013, 10:30–11:00, H10

From magnon flow to spin current and back — •Andrii Chumak — Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

Magnons have great potential for applications in the transfer and processing of spin information in spintronics. However, this potential can only be fulfilled if an effective means to convert magnon flows into electron-carried spin and charge currents and back is found. The first part of my talk will concentrate on magnon to charge current converters exploiting a combination of two separate physical phenomena: spin pumping, and the inverse spin Hall effect (SHE). In these systems, a precessing magnetization in a magnetic film results in the injection of a spin current into a normal metal layer on its surface through spin pumping and this spin current is then converted into a charge current via the inverse SHE. I shall present a set of experimental results on yttrium iron garnet (YIG) - Pt bi-layers demonstrating that magnons having wavelengths spanning a wide range (from centimeters down to a hundred nanometers) efficiently contribute to spin pumping. I shall also discuss a way of improving of the YIG-Pt interface capable of increasing the spin pumping efficiency. Next I shall discuss charge current to magnon conversion via the direct SHE and spin transfer torque (STT) in similar structures. Our experiments show that passing a DC current through a surface Pt layer results in a variation of spin-wave damping of up to twenty percent in a two-micron thick YIG film. We acknowledge financial support by the DFG (project CH 1037/1-1).