Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.4: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Ultrafast demagnetization dynamics including spin and charge transport. — •Sanjay Ashok, Sebastian T. Weber, Johan Briones, and Baerbel Rethfeld — Fachbereich Physik and OPTIMAS Research Center, TU Kaiserslautern, Kaiserslautern, Germany.

Subpicosecond Demagnetization of ferromagnetic materials due to excitation with an ultrafast laser pulse was discovered by Beaurepaire et. al. in 1996 [1]. Understanding its mechanism is still an important problem in cutting edge physics due to its applicability in faster spintronic and magnetic data storage devices.

A recently proposed μT-model [2] traces the equilibration of chemical potentials and temperatures of spin-up and spin-down electrons seperately. Their dynamics is modelled using coupled transport equations. So far, ultrafast demagnetization using μT-model has been studied only in cases where the thickness of the sample is of the order of penetration depth (where transport can be neglected). Here, we study the space and time resolved dynamics in case of thicker samples including the transport and present preliminary results.

References:

[1] E. Beaurepaire, J.-C. Merle, A. Daunois and J.-Y. Bigot, Phys. Lett. 76, 4250 (1996).

[2] B. Y. Mueller and B. Rethfeld, Phys. Rev. B 90, 144420 (2014).