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MA: Fachverband Magnetismus
MA 60: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)
MA 60.11: Vortrag
Freitag, 20. März 2020, 12:15–12:30, HSZ 04
Influence of structure and cation distribution on magnetic anisotropy and damping in Zn/Al doped nickel ferrites — •Julia Lumetzberger, Martin Buchner, Santa Pile, Verena Ney, and Andreas Ney — Johannes Kepler University Linz, Institute for Semiconductor and Solid State Physics, Linz, Austria
In spintronics one aims to obtain pure spin currents as an additional degree of freedom. To ensure a pure spin component ferromagnetic insulators are the material of choice. Promising results are obtained by cubic NiZnAl ferrite thin films grown on spinel MgAl2O4[1].In this contribution we use reactive magnetron sputtering as a preparation method to optimise the magnetic properties. All samples are analysed with X-ray diffractometry for their crystallographic properties. Furthermore, the angular and frequency dependence of the resonance position is measured by ferromagnetic resonance (FMR) and fitted to quantify the anisotropy fields as well as magnetic damping. Additionally, transmission electron microscopy is performed to investigate the interface on an atomic scale and the chemical composition by means of ion beam analysis. In a last step x-ray magnetic circular dichroism (XMCD) and XMCD (H) at the L3,2 edge of Ni and Fe are performed to complement the integral SQUID magnetometry measurements and evidence their magnetic contributions to the hysteresis separately. A comparison between similarly strained materials revealed the importance of site occupancy as a major tuning factor for magnetic anisotropy and damping [2]. [1] S. Emori et. al., Adv. Mater. (2017), 29, 1701130 [2] J. Lumetzberger, arXiv:1908.08257 (2019)