Probing ultrafast spin transport with terahertz electromagnetic pulses

Tobias Kampfrath, Freie Unversität Berlin and Fritz Haber Institute of the Max Planck Society, Berlin

Transport of spins is often driven by heat gradients and electric fields. To probe the initial elementary steps which lead to the formation of spin currents, we need to launch and measure transport on femtosecond time scales. This goal is achieved by employing both ultrashort optical and terahertz electromagnetic pulses. We illustrate our experimental approach by several examples including the spin Seebeck effect (see figure) and anisotropic magnetoresistance.

References

[1] Seifert et al., Nature Comm. 9, Article number: 2899 (2018)
[2] Seifert et al., J. Phys. D: Appl. Phys. 51, 364003 (2018)

PDF file of the talk available here