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O: Fachverband Oberflächenphysik
O 71: Electronic Structure of Surfaces I
O 71.4: Vortrag
Mittwoch, 18. März 2020, 16:00–16:15, REC C 213
Co on W(110): Spin-dependent interface effects in the electronic structure — •Marcel Holtmann1, Pascal J. Grenz1, Eike F. Schwier2, Shiv Kumar2, Koji Miyamoto2, and Markus Donath1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster — 2Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan
The surface of W(110) exhibits a topologically nontrivial Dirac-cone like state within a spin-orbit induced symmetry gap [1, 2]. When depositing ultrathin Fe films, the state was found to behave differently depending on the film thickness, allowing for manipulation of the "Dirac-fermion mass" via magnetic influence [3]. In order to systematically study the impact of the magnetic adsorbate material, we have investigated the influence of cobalt on the occupied band structure of W(110). In this talk, I will be presenting our results on the preparation of Co/W(110) as well as spin-resolved measurements of the occupied band structure. As in the case of Ni/W(110), we observed growth in the Nishiyama-Wassermann mode. No alteration of the dispersion behavior of the Dirac-cone like surface state was observed - the state gradually fades away with increasing film thickness. Close to the Fermi energy we detected Co-induced interface states, which show Rashba-type spin splitting for submonolayer cobalt coverages.
[1] K. Miyamoto et al., Phys. Rev. Lett. 108, 066808 (2012) [2] D. Thonig et al., Phys. Rev. B 94, 155132 (2016) [3] K. Honma et al., Phys. Rev. Lett. 115, 266401 (2015)