Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.55: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Ultrafast Demagnetization: Role of Transport and Substrates — •S. Ashok, S. T. Weber, C. Seibel, J. Briones, and B. Rethfeld — Department of Physics and Optimas Research Center, University of Kaiserslautern, Germany

Ultrafast demagnetization [1], its mechanism and the spin-resolved currents generated during it, have attracted immense attention and posses great technological applicability. The non-equillibrium in the spin-resolved chemical potentials can be described as a driving force behind ultrafast demagnetization [2]. Using this observation, the thermodynamic μT-model traces the spin-resolved non-equillibrium electron temperatures, chemical potentials and demagnetization dynamics [3]. The demagnetization in thin Nickel ferromagnetic films was studied, when the material is uniformly heated and all transport effects can be neglected.

We extend the model to the case of thicker ferromagnetic films where the role of transport becomes prominent. Here, we present the role of particle and energy transport in the ultrafast demagnetization by observing the temporal and spatial evolution of temperatures, chemical potentials and magnetization. We also present preliminary results on the role of substrates.

[1] Beaurepaire E. et al., PRL 76, 4250 (1996)

[2] Mueller B. et al., PRL 111, 167204 (2013)

[3] Mueller B. and B. Rethfeld, PRB 90, 144420 (2014).