Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 58: Surface magnetism II

MA 58.6: Talk

Friday, March 16, 2018, 10:45–11:00, EB 202

Spin-resolved dispersion relation of a single Co island — •Hirofumi Oka and Tadahiro Komeda — Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan

Scanning tunneling microscopy and spectroscopy (STM/STS) are powerful tools to study on the nanometer (nm) scale spatial modulations of the electronic local density of states (LDOS), which are caused by quantum interference between electron waves scattered off nanostructure boundaries. The analysis of modulation patterns gives the dispersion relation of electronic states. When electrons are confined to magnetic nanostructures, spin-dependent quantum interference occurs and spatial modulations of the LDOS become spin-polarized [1]. Here we report on the observation of spin-polarized modulations of the LDOS within a single Co island on Cu(111) using spin-polarized STM/STS (SP-STM/STS). We show that the spin-resolved dispersion relation of surface states of a nm-small Co island can be obtained by analyzing the spin-polarized LDOS modulations.

[1] H. Oka, P.A. Ignatiev, S. Wedekind, G. Rodary, L. Niebergall, V.S. Stepanyuk, D. Sander, and J. Kirschner, Science 327, 843 (2010).

*Present address (H.O.): Advanced Institute for Marerials Research (AIMR), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.