SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Spintronics (other effects)

MA 20.2: Vortrag

Dienstag, 28. März 2023, 15:15–15:30, HSZ 401

Crystallisation behaviour of Yttrium Iron Garnet thin films — •Sebastian Sailler¹, Michaela Lammel¹, Gregor Skobjin¹, Heike Schlörb², Andy Thomas^2,3, and Sebastian T.B. Goennenwein¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Institute for Integrative Nanosciences, Leibniz Institute of Solid State and Materials Science, 01069 Dresden, Germany — ³Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany

Yttrium Iron Garnet (YIG) is a ferrimagnetic insulator commonly used in spin transport and spin dynamics. To obtain highly crystalline thin films we use RF-magnetron sputtering at room temperature to deposit amorphous films and a subsequent annealing step to crystallise them. However, the crystallisation from the amorphous state has not been systematically studied. We therefore analyse the crystallisation behaviour on different substrates utilizing extensive time and temperature series. Structural characterisation using X-ray techniques as well as electron diffraction allow to differentiate between amorphous, polycrystalline and epitaxial films, and to determine the optimal annealing parameters for each substrate. Additionally, we correlate the crystalline state with the resulting magnetic properties inferred from magnetometry and Kerr-microscopy. Our results provide a precise tunability of the structural and magnetic properties of YIG by a rigorous control over the crystallization induced by the subsequent annealing step.