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MA: Fachverband Magnetismus

MA 23: Magnetic Thin Films II

MA 23.2: Vortrag

Mittwoch, 25. März 2009, 15:00–15:15, HSZ 04

Néel state of a Cr monolayer on Pd(111):spin-polarized STM and first-principles calculations — •Marta Waśniowska^1,2, Silke Schröder³, Paolo Ferriani³, and Stefan Heinze³ — ¹Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle — ²Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart — ³Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, D-20355 Hamburg

Spin averaged and spin polarized scanning tunneling microscopy at 5 K was performed on a Cr monolayer on Pd(111). The results reveal that the initial film grows in 3D irregular islands and the first layer grows pseudomorphically. Conventional STM measurements with nonmagnetic tips show the hexagonal chemical unit cell containing three different contrast levels corresponding to the Cr atom and the fcc and hcp site. Using spin polarized STM operated in the constant current mode, we observe a (√3 × √3) superstructure indicative of a non-collinear magnetic ground state with moments forming 120^∘ angles between nearest neighbor Cr atoms. The magnetic ground state and the STM images are explained based on ab initio calculations.