Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Surface magnetism and magnetic coupling phenomena (joint session MA/O/TT)

MA 5.3: Vortrag

Montag, 1. April 2019, 10:00–10:15, H53

Reduced magnetic moment in polycrystalline Co thin films — •Sabine Pütter1, Amir Syed Mohd1, Artur Glavic2, Stefan Mattauch1, and Thomas Brückel31Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Garching, Germany — 2Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen PSI, Switzerland — 3Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institute (PGI): JCNS-2, PGI-4: Quantum Materials and Collective Phenomena, Jülich, Germany

The variation of the magnetic moment with dimensionality of magnetic materials, i. e. from atoms to bulk, is a longtime studied issue. For thin films, a constant magnetic moment is often assumed in modelling, however, intermixing and surface roughness may also have an impact.

With the help of polarised neutron reflectometry (PNR) we study the magnetic moment of polycrystalline Co/20 nm Pt/MgO(001). The samples were grown by molecular beam epitaxy and subsequently measured with PNR at room temperature and in saturation in UHV.

Our results reveal the vertical depth profile of the magnetic moment of the Co films. In fact, the magnetisation is not constant but smeared out at the edges, due to roughness. Measurements at different film thicknesses reveal the evolution of the magnetic moment which is separated in a bulk and a surface contribution and discussed with respect to published results.

This project has received funding from the EU’s H2020 research and innovation programme under grant agreement n. 654360.

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