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O: Fachverband Oberflächenphysik

O 31: Surface and Interface Magnetism I (jointly with MA)

O 31.2: Vortrag

Dienstag, 12. März 2013, 10:45–11:00, H33

Structure Driven Complex Magnetic Ordering of a CoO Overlayer on Ir(100) — •Florian Mittendorfer¹, Josef Redinger¹, Raimund Podloucky², and Michael Weinert³ — ¹Inst. of Applied Physics, TU Vienna — ²Inst. of Physical Chemistry, Univ. Vienna — ³Univ. Wisconsin-Milwaukee

The adsorption of a mono-layer thick magnetic oxide film on an unmagnetic substrate offers a playground to study the relation between the geometrical structure and the magnetic properties of the film.

I will present our recent results on the magnetic ordering in the ultrathin hexagonal c(10x2) CoO(111) film supported on Ir(100) [1], obtained on the basis of ab initio calculations with the Vienna Ab-initio Simulations Package (VASP). We find a close relationship between the local structural properties of the oxide film and the induced magnetic order, leading to alternating ferromagnetically and antiferromagnetically ordered segments. While the local magnetic order is directly related to the geometric position of the Co atoms, the mismatch between the CoO film and the Ir substrate leads to a complex long-range order of the oxide.

[1] Phys. Rev. Lett. 109 (2012) 015501.