title: Picosecond Spin Seebeck Effect.
abstract: We report time-resolved magneto-optic Kerr effect measurements of the longitudinal spin Seebeck effect in normal metal/Y_{3}Fe_{5}O_{12} bilayers driven by an interfacial temperature difference between electrons and magnons. The measured time evolution of spin accumulation induced by laser excitation indicates transfer of angular momentum across normal metal/Y_{3}Fe_{5}O_{12} interfaces on a picosecond time scale, too short for contributions from a bulk temperature gradient in an yttrium iron garnet. The product of spin-mixing conductance and the interfacial spin Seebeck coefficient determined is of the order of 10^{8}  A m^{-2} K^{-1}.
authors.affiliation: Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: Johannes
authors.initials: J
authors.lastname: Kimling
authors.affiliation: Center for Spintronics, Korea Institute of Science and Technology, Seoul 136-791, Korea.
authors.forename: Gyung-Min
authors.initials: GM
authors.lastname: Choi
authors.affiliation: Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA.
authors.forename: Jack T
authors.initials: JT
authors.lastname: Brangham
authors.affiliation: Center for Spinelectronic Materials and Devices, Department of Physics, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.
authors.forename: Tristan
authors.initials: T
authors.lastname: Matalla-Wagner
authors.affiliation: Center for Spinelectronic Materials and Devices, Department of Physics, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.
authors.forename: Torsten
authors.initials: T
authors.lastname: Huebner
authors.affiliation: Center for Spinelectronic Materials and Devices, Department of Physics, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.|Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands.
authors.forename: Timo
authors.initials: T
authors.lastname: Kuschel
authors.affiliation: Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA.
authors.forename: Fengyuan
authors.initials: F
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: David G
authors.initials: DG
authors.lastname: Cahill