SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.5: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Ultrafast demagnetization dynamics including spin-, charge- and heat-transport. — •Sanjay Ashok, Sebastian T. Weber, Christopher Seibel, Johan Briones, and Bärbel Rethfeld — Fachbereich Physik and OPTIMAS Research Center, TU Kaiser- slautern, Kaiserslautern, Germany

Ultrafast Demagnetization of metallic ferromagnets induced by femtosecond laser is usually studied in homogeneously heated thick films. In such cases, due to absence of temperature and density gradients within the material, there are no heat- or charge-currents. For thicker magnetic metals, the heating is not uniform and spin-, charge- and heat-transport contribute to ultrafast de- and re- magnetization. Here we study the role of spin-resolved charge and heat transport in ultrafast demagnetization of thick magnetic metal using the thermodynamic μT-model [1] and obtain spatial and temporal evolution of magnetization. We also study the role of transport for the relation between quenching and quenching time. Further, we analyze the different transport mechanisms and their contributions to measureable quantities.

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