Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Magnetic Scattering Methods

MA 53.1: Vortrag

Freitag, 11. März 2016, 09:30–09:45, H33

Growth and interfacial properties of FePt/Fe/NiO and FePt/NiO/Fe trilayers — •Amir Syed Mohd, Sabine Pütter, Stefan Mattauch, Alexandros Koutsioubas, and Thomas Brückel — Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Garching, Germany

The exchange coupling between different types of magnetic thin films has opened possibilities to develop functional nanostructures. This phenomenon is governed mainly by the interfacial properties and emerges as exchange bias effect [when a ferromagnet (e.g. Fe) is coupled with an antiferromagnet (e.g. NiO)] and as exchange spring effect [when a hard ferromagnet (e.g. FePt) is coupled with a soft ferromagnet (e.g. Fe)] in bilayers and multilayers [1, 2].

In this work we have deposited FePt/Fe/NiO and FePt/NiO/Fe trilayers using molecular beam epitaxy (MBE) method on MgO(001) under similar conditions. In-situ reflection high energy electron diffraction (RHEED) patterns show that the growth morphologies of Fe/NiO and NiO/Fe are different and lead to epitaxial and textured growth respectively. In order to study the interfacial properties, ex-situ x-ray reflectivity (XRR) and polarised neutron reflectivity (PNR) have been performed. XRR and PNR results indicate that deposition of NiO on Fe forms a complex structure of Fe-O at the interface as a result magnetic coupling is suppressed between Fe and NiO. The obtained results will be discussed in more detail during presentation.

[1] P. K. Manna et al., Physics Reports 535, 61 (2014). [2] N. de Sousa et al., Phys. Rev. B 82, 104433 (2010).