title: Energy equilibration processes of electrons, magnons, and phonons at the femtosecond time scale.
abstract: We relate the energy dissipation processes at the femtosecond (electron-spin relaxation time tau el-sp) and nanosecond time scale (Gilbert relaxation taualpha) to the microscopic model proposed by Koopmans [Phys. Rev. Lett. 95, 267207 (2005)]. At both time scales, Elliot-Yafet scattering is proposed as the dominant contribution. We controllably manipulate the energy dissipation by transition metal doping (Pd) and rare earth doping (Dy) of a Permalloy film. While a change in taualpha of more than a factor of 2 is observed, tau el-sp remains constant. We explain the discrepancies as due to relaxation channels not considered in the model.
authors.affiliation: IV, Physikalisches Institut, Universität Göttingen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Walowski
authors.forename: G
authors.initials: G
authors.lastname: Müller
authors.forename: M
authors.initials: M
authors.lastname: Djordjevic
authors.forename: M
authors.initials: M
authors.lastname: Münzenberg
authors.forename: M
authors.initials: M
authors.lastname: Kläui
authors.forename: C A F
authors.initials: CA
authors.lastname: Vaz
authors.forename: J A C
authors.initials: JA
authors.lastname: Bland