Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Surface Magnetism (joint session O/MA)

O 30.4: Vortrag

Dienstag, 2. April 2019, 11:15–11:30, H37

Epitaxial growth of the ultrathin EuS films on the InAs(001) and magnetic coupling between these films and organometallic phthalocyanine monolayers — •Carmen González Orellana, Maxim Ilin, and Celia Rogero — Centro de Física de Materiales, San Sebastián, Spain

EuS has recently attracted a lot of interest because of its ability of creating strong exchange fields when its placed in contact with non-ferromagnetic materials. For instance, at the interface between EuS and the topological insulator Bi2Se3, interfacial ferromagnetism was found to persist up to room temperature, despite the low Tc of bulk EuS (16.6 K). Furthermore, the formation of a new ferromagnetic ground state of the Dirac electrons in graphene was inferred on the basis of the electrical characterization of devices featuring a graphene/EuS interface.

I will present results of our work aimed to study the properties of the ultrathin EuS films and the interfaces between EuS and the organometallic pthalocyanines. We have optimized the epitaxial growth of EuS ultrathin films (< 1nm) on single crystal semiconducting InAs(001) substrates and characterized their structural and magnetic properties using LEED, STM, XPS, ex-situ magnetometry and in-situ XMCD techniques. Furthermore, we have grown monolayers of organometallic pthalocyanines (CuPC and MnPC) and performed XMCD measurements to probe the difference in the exchange coupling of the paramagnetic molecules with metallic (Ni, Co) and semiconducting (EuS) ferromagnets.

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