Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.44: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Magnetic charactarization of pure and doped epitaxial γ’-Fe₄N thin films — •Philipp Zilske and Markus Meinert — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

Because of their excellent magnetic properties, iron nitrides are potential materials for spintronic devices. For example, negative TMR of -75% was demonstrated in MTJs with one Fe₄N electrode [1].

To study the influence of doping, epitaxial γ’-Fe₄N films were grown on MgO (001) substrates by reactive magnetron sputtering. Diffraction measurements revealed that films with the correct stoichiometry can be grown at 450^∘C. The magnetic properties of the γ’-Fe₄N were studied by vectorial Kerr magnetometry. The hysteresis loops reveal a biaxial anisotropy due to the cubic perovskite structure and very sharp switching. Particularly the latter points to high crystal quality of the films. The loops characterize the crystalline [100] direction as the easy magnetization axis.

In addition, epitaxial Fe₃MnN, Fe₃NiN and Fe₃CoN films were prepared successfully and we discuss their magnetic properties.

[1] Y. Komasaki et al., J. Appl. Phys. 105, 07C928 (2009)