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We present experimental control of the magnetic anisotropy in a gadoliniumiron garnet (GdIG) thin film from in-plane to perpendicular anisotropy bysimply changing the sample temperature. The magnetic hysteresis loops obtainedby SQUID magnetometry measurements unambiguously reveal a change of themagnetically easy axis from out-of-plane to in-plane depending on the sampletemperature. Additionally, we confirm these findings by the use of temperaturedependent broadband ferromagnetic resonance spectroscopy (FMR). In order todetermine the effective magnetization, we utilize the intrinsic advantage ofFMR spectroscopy which allows to determine the magnetic anisotropy independentof the paramagnetic substrate, while magnetometry determines the combinedmagnetic moment from film and substrate. This enables us to quantitativelyevaluate the anisotropy and the smooth transition from in-plane toperpendicular magnetic anisotropy. Furthermore, we derive the temperaturedependent $g$-factor and the Gilbert damping of the GdIG thin film.

Perpendicular magnetic anisotropy in insulating ferrimagnetic gadolinium iron garnet thin films