Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.15: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Ab-initio analysis of longitudinal and transverse spin relaxation times of magnetic single adatoms: — •Julen Ibanez-Azpiroz1, Manuel dos Santos Dias2, Stefan Blugel2, and Samir Lounis2 — 1Centro de Fisica de Materiales — 2Forschungszentrum Jülich
We present a systematic ab initio investigation of the longitudinal and transverse spin relaxation times of magnetic single adatoms deposited on metallic substrates. Our analysis based on time-dependent density functional theory shows that the longitudinal time, T∥, is of order femtosecond while the transverse time, T⊥, is of order picosecond, i.e. T⊥≫ T∥. This comes as a consequence of the different energy scales of the corresponding processes: T∥ involves spin-density excitations of order eV, while T⊥ is governed by atomic spin-excitations of order meV. Comparison to available inelastic scanning tunneling spectroscopy dI/dV experimental curves shows that the order of magnitude of T⊥ agrees well with our results. Regarding T∥, the time scale calculated here is several orders of magnitude faster than what has been measured up to now; we therefore propose that an ultrafast laser pulse measuring technique is required in order to access the ultrafast spin-dynamics described in this work.