Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.44: Poster
Tuesday, March 17, 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)