Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.27: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Investigation of magnetic properties of epitaxial Fe₃O₄ and Fe₃O₄/NiO bilayers grown on MgO(001) and SrTiO₃(001) via VSM — •Kevin Ruwisch, Jari Rodewald, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49079 Osnabrück, Germany

Magnetite as a ferrimagnet has become more important for industrial applications in spintronics over the years. For instance, it is used in magnetoresistive random-access memory (MRAM) consisting of magnetic tunnel junctions (MTJ). Thus, improving the magnetic properties of ferrimagnetic films for spintronic devices is very important.

Hence, in this work Fe₃O₄ and Fe₃O₄/NiO bilayers, grown by reactive molecular beam epitaxy (RMBE) on MgO(001) and SrTiO₃(001), are investigated via vibrating sample magnetometry (VSM).

One approach of characterizing the magnetic features of Fe₃O₄ and Fe₃O₄/NiO is to evaluate the impact of NiO towards coercivity, remanence and magnetocrystalline anisotropy. Here, Fe₃O₄/NiO/MgO exhibits 45^∘-rotated magnetic easy axes in ⟨ 110 ⟩ directions while thin magnetite films deposited on MgO(001) have easy axes in ⟨ 100 ⟩ directions. Furthermore, the difference in the magnetic properties of magnetite on both substrates is evaluated. It shows that a 45^∘-rotation, including larger absolute values in coercivity and remanence, takes place on SrTiO₃(001) in contrast to MgO(001). Additionally, the influence of the layer thickness of magnetite towards the magnetic behaviour is investigated in in-plane and out-of-plane-orientation with respect to the applied magnetic field.