Analysis of Magnetic Anisotropy Constants Obtained from Hall Data Using Generalized Sucksmith Thompson Method on NiCo<sub>2</sub>O<sub>4</sub>(001) Films with Tilted Preferential Direction

We investigated the magnetic anisotropy of NiCo2O4 thin film with a relatively large second-order magnetic anisotropy, which gives rise to easy-cone magnetic anisotropy. Anomalous Hall data measured in external magnetic fields at various angles were analyzed based on the generalized Sucksmith-Thompson (GST) method to quantitatively extract both the first- and second-order anisotropy constants. Although the GST model is valid for any external field angle, we found that the analysis was useful only when the field was either parallel or normal to the film plane. However, the tilted magnetic field results show the effect of misalignment between the actual and expected angles of the field. Our results indicate the validity of estimating higher-order magnetic anisotropy and adjusting the misalignment of measurement systems.