4.8 Article

Energy Equilibration Processes of Electrons, Magnons, and Phonons at the Femtosecond Time Scale

Journal

PHYSICAL REVIEW LETTERS
Volume 101, Issue 23, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.237401

Keywords

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Funding

  1. Deutsche Forschungsgemeinschaft [SPP 1133]
  2. EPSRC (UK)

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We relate the energy dissipation processes at the femtosecond (electron-spin relaxation time tau(el-sp)) and nanosecond time scale (Gilbert relaxation tau(alpha)) 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 tau(alpha) 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.

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