Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.56: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Particle-in-Cell Model for Electronic Transport in Metallic Heterostructures — •Marius Weber, Dennis Michael Nenno, and Hans Christian Schneider — University of Kaiserslautern, Kaiserslautern, Germany

Ultrafast demagnetization dynamics triggered by ultrashort laser excitation can be influenced decisively by hot carrier transport in ferromagnet-metal heterostructures [1]. Motivated by recent experiments [2,3], we investigate the transport behavior of excited electrons in Gold. In our model, the electronic dynamics of "hot" electrons is described using the Boltzmann Transport Equation (BTE) and includes the generation of secondary electrons by scattering processes. We use a particle-in-cell (PIC) approach to solve the BTE and calculate the diffusion coefficient. We demonstrate that this approach reproduces the generalized diffusion coefficient as found in Ref. [4] and study the electronic dynamics in a single metal layer in detail. We also show that interfaces in metallic sandwich structures can play a crucial role in electronic spin transport.

[1] D. Rudolf et al., Nature Communications 3, 1037 (2012)

[2] A. Melnikov et al., Physical Review Letters 107, 076601 (2011).

[3] N. Bergeard et al., Physical Review Letters 117, 147203 (2016).

[4] M. Battiato, K. Carva, and P. M. Oppeneer, Physical Review B 86, 024404 (2012).