Magnetic domain structure of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy

•Growth of the ferrimagnetic (100) NiCo2O4 film with perpendicular magnetic anisotropy.•Observation of magnetic domain structure with magnetic field, temperature, or time.•Creation and expansion of worm-like magnetic domains with a few micrometer size.•Indistinctive changes of magnetic domain structure with temperature and time.