Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects 1

MA 8.9: Talk

Monday, September 5, 2022, 17:00–17:15, H37

Role of diffusive transport in ultrafast demagnetization dynamics — •Sanjay Ashok, Sebastian T. Weber, Christopher Seibel, Johan Briones, and Bärbel Rethfeld — Fachbereich Physik and OPTIMAS Research Center, TU Kaiserslautern, Kaiserslautern, Germany

Ultrafast demagnetization dynamics in thick metallic magnetic films is greatly influenced by transport processes. In this contribution we present the space-resolved magnetization dynamics in a thick Nickel film induced by a femtosecond laser pulse [3]. Starting from the thermodynamic μT-model [1], we explicitly include diffusive heat transport, spin-resolved charge transport, as well as Seebeck and Peltier effects.

Our results show that the spatial dependence of maximal magnitude of quenching is induced by a depth-dependent energy deposition and is only moderately equilibrated by transport processes. We reveal a stronger influence of transport on the time of quenching which becomes nearly independent of depth [3].

Additionally, we present the influence of pump-wavelength [2] on spatially resolved magnetization dynamics.

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

[2] U. Bierbrauer et al., JOP Cond. Mat., 29 (24), 244002 (2017)

[3] S. Ashok et al., Appl. Phys. Lett. 120, 142402 (2022)