Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 92: Focus Session: Spinorbitronics - From Efficient Charge/Spin Conversion Based on Spin-Orbit Coupling to Chiral Magnetic Skyrmions II (joint session MA/TT)

TT 92.3: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, H 1012

Scattering of surface and interface states at skyrmionic quasi-particles interacting with defects. — •Imara L. Fernandes, Mohammed Bouhassoune, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Magnetic skyrmions are promising candidates as bits of a future information technology. The precise manipulation and detection of such small magnetic nanostructures is a key ingredient for future applications in spintronics devices. Recently, we proposed the tunneling spin-mixing magnetoresistance (TXMR) to detect magnetic skyrmions by all-electrical means [1,2]. The TXMR effect originates from the non-alignment of magnetic moments and it is affected by the presence of spin-orbit interaction. We explore from a full ab initio approach the possibility of tuning the TXMR by inserting 3d and 4d transition metal defects at the vicinity of skyrmions generated in PdFe bilayer deposited on Ir(111). In the latter system, we identify surface and interface states leading to pronounced TXMR signals after scattering at skyrmionic quasi-particles. We extract the lifetimes of these confined states and draw conclusions concerning the impact of skyrmions and various atomic defects.
[1] D.M. Crum et al., Nat. Commun. 6, 8541 (2015).
[2] C. Hanneken et al., Nat. Nanotech, 10, 1039 (2015).
– Funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 - DYNASORE).