Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 58: Spintronics II (jointly with TT, HL)
MA 58.1: Vortrag
Donnerstag, 17. März 2011, 17:15–17:30, HSZ 401
Spin pumping by short-wavelength exchange-dominated magnons excited by parametric pumping — •Andrii V. Chumak1, Christian W. Sandweg1, Yosuke Kajiwara2, Vitaliy V. Vasyuchka1, Alexander A. Serga1, M. Benjamin Jungfleisch1, Eiji Saitoh2, and Burkard Hillebrands1 — 1FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Spin pumping from a ferromagnet to a nonmagnetic metal detected by the Spin Hall effect (SHE) has great potential in the context of the development of spintronic devices. In addition, it offers exciting possibilities for the use of spin waves (or their quanta, magnons) for carrying and processing spin-information [Y. Kajiwara, et al., Nature 464, 262 (2010)]. Until now, all experimental investigations into spin pumping have been realized using dipolar-dominated magnons with long wavelengths (limited by the size of the exciting antenna).
Here, we present studies of spin pumping in an exchange-dominated magnon system. Magnons were excited in a ferrite Yttrium Iron Garnet (YIG) film by frequency doubled parametric pumping. The spin pumping was detected via the SHE in a Pt layer deposited directly onto the YIG. Contributions to the spin pumping from different magnon groups, including magnons from the lowest energy state were studied. We show that spin pumping is possible even for magnons without an associated dipolar field. However, the magnon localization, which is in general inversely proportional to wavelength, is of high importance.