Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Oxide and Insulator Surfaces: Structure, Epitaxy and Growth I

O 31.4: Vortrag

Dienstag, 21. März 2017, 11:15–11:30, WIL C107

Well-ordered ultrathin oxides on magnetic substrates: tuning the magnetic properties through atomic scale control of the interface chemistry. — •andrea picone — Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

In the last 20 years, a large body of knowledge has been gained on the preparation and characterization of ultra-thin oxide films on noble and quasi noble metals [1,2]. Oxide/metal inverse model catalysts have been successfully exploited for the study of complex chemical processes occurring on solid surfaces. Despite their extreme importance in the field of spintronics, comparatively much less work has been devoted to the atomic scale investigation of epitaxial oxide films deposited on top of ferromagnetic substrates [3]. Whenever an oxide film is grown on the surface of a ferromagnetic metal, a remarkable structural and chemical modification of the substrate occur. Taking into account these alterations is extremely important, since the magnetic order of the atoms is directly affected by their local chemical environment. By considering the Fe(001) surface as paradigmatic example of ferromagnetic substrate and highly reactive metal, I will show how the chemical composition of the oxide/Fe(001) layered systems can be finely tuned, and how their magnetic properties depend on the interface chemistry.

[1] S. Surnev, A. Fortunelli, F.P. Netzer Chem. Rev. 113, 4314 (2013).

[2] HJ Freund, G. Pacchioni Chem. Soc. Rev. 37, 2224 (2008).

[3] A. Picone et al. Surf. Sci. Rep. 71, 32 (2016).