Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Ultrafast Magnetization I

MA 2.5: Talk

Monday, March 16, 2020, 10:30–10:45, HSZ 101

Role of spin resolved charge and heat transport in ultrafast demagnetization dynamics — •Sanjay Ashok, Sebastian Weber, Christopher Seibel, Johan Briones, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS , TU Kaiserslautern, Kaiserslautern, Germany.

Starting from the itinerant picture of metallic magnetism (Stoner-model) and the ultrafast reduction of exchange-splitting [1, 2] the Thermodynamic μT-model [3] describes ultrafast quenching of magnetization by tracing the equilibration of chemical potentials and temperatures of spin-up and spin-down electrons and temperature of lattice separately.

In case of thin metallic ferromagnets, the laser pulse heats the material homogeneously, therefore transport effects can be neglected. However, for thicker films and bulk materials, transport effects become essential. Therefore, one needs to distinguish the role of heat and charge transport (caused by the inhomogenous heating) in demagnetization dynamics of thicker metallic ferromagnets.

We model the ultrafast demagnetization of thick magnetic metal using the Thermodynamic μT-model. In this talk we present results on spatial and temporal evolution of magnetization, distinguishing the role of various transport channels.

[1] S. Essert and H. C. Schneider, Phys. Rev. B 84, 224405 (2011).

[2] B. Y. Mueller et al., Phys. Rev. Lett.111, 167204 (2013).

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