Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Surface Magnetism – Skyrmions (jointly with MA, O)
TT 14.9: Talk
Monday, March 16, 2015, 11:45–12:00, EB 301
First-principles study of confined magnetic skyrmions in Pd/Fe/Ir(111) — •Dax Michael Crum1,2, Benedikt Schweflinghaus1, Mohammed Bouhassoune1, Juba Bouaziz1, Stefan Blügel1, and Samir Lounis1 — 1Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — 2Microelectronics Research Center, The University of Texas at Austin, Austin Texas, 78758 USA
We investigate for the first time confined skyrmionic magnetic defects in an otherwise ferromagnetic thin film from first-principles. The system of choice is Pd/Fe on Ir(111) [1,2]. Utilizing the full-potential relativistic Korringa-Kohn-Rostoker Green functions formalism, we investigate in real-space the energetics of creating single chiral magnetic textures purely from ab initio. We find that the nano-skyrmion structures become energetically more favorable with increasing size. We interpret the results by extracting the tensors of magnetic exchange interactions and modeling the system within an extended Heisenberg Hamiltonian, where the Dzyaloshinskii-Moriya interaction plays a key role. We also investigate the theoretical scanning tunneling microscopy spectra by analysing the local density of states in vacuum near the skyrmion surface and make connection to available experiments [1].
This work is supported by the HGF-YIG Programme VH-NG-717 (Functional Nanoscale Structure and Probe Simulation Laboratory – Funsilab) and the US National Science Foundation (NSF).
[1] Romming et al., Science 341, 636 (2013).
[2] B. Dupé et al., Nature Communications 5, 4030 (2014).