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

Jakob Walowski | Zendy; G. Müller | Zendy; Marija Djordjević | Zendy; Markus Münzenberg | Zendy; Mathias Kläui | Zendy; C. A. F. Vaz | Zendy; J. A. C. Bland | Zendy

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

Author(s) -

Jakob Walowski,

G. Müller,

Marija Djordjević,

Markus Münzenberg,

Mathias Kläui,

C. A. F. Vaz,

J. A. C. Bland

Publication year - 2008

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.101.237401

Subject(s) - physics , condensed matter physics , relaxation (psychology) , magnon , electron , nanosecond , energy (signal processing) , femtosecond , dissipation , phonon , scattering , atomic physics , quantum mechanics , laser , ferromagnetism , psychology , social psychology

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.

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