Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Focus Session: Spinorbitronics - From Efficient Charge/Spin Conversion Based on Spin-Orbit Coupling to Chiral Magnetic Skyrmions I (joint session MA/TT)

TT 78.6: Vortrag

Donnerstag, 15. März 2018, 11:45–12:00, H 1012

Dynamical spin-orbitronic effects in exchange-bias bilayers from first-principles — •Filipe Souza Mendes Guimarães, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

The interplay between charge and spin has been extensively studied in ferromagnetic systems. Recently, the focus has shifted to antiferromagnets, which are insensitive to external magnetic fields and offer much faster dynamics. When ferromagnets and antiferromagnets are coupled through the exchange bias, we can combine the best of both worlds [1]. For a deep understanding of such complex structures, a microscopic material-specific dynamical theory, such as the one we developed, is crucial [2,3]. In this work, we apply our theory to an idealized FePt/PtMn bilayer, to identify how the ferromagnet/antiferromagnet interface contributes to the dynamical magnetization and transport properties. We demonstrate how the resonances, reaching the THz range, may enhance the currents flowing through the system. The layer-resolved magnetic interactions and spin-orbit torques can also be used to understand switching processes of this type of heterostructures.
[1] S. Fukami et al., Nature Materials 15, 535–541 (2016)
[2] F. S. M. Guimarães et al., Phys. Rev. B 92, 220410(R) (2015)
[3] F. S. M. Guimarães et al., Sci. Rep. 7, 3686 (2017)
– Funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 – DYNASORE).