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We present a systematic study of the magnetic properties of semiconductingZnFe$_2$O$_4$ thin films fabricated by pulsed laser deposition at low and highoxygen partial pressure and annealed in oxygen and argon atmosphere,respectively. The magnetic response is enhanced by annealing the films at250$^{\circ}$C and diminished at annealing temperatures above 300$^{\circ}$C.The initial increase is attributed to the formation of oxygen vacancies afterargon treatment, evident by the increase in the low energy absorption at $\sim$0.9 eV involving Fe$^{2+}$ cations. The weakened magnetic response is relatedto a decline in disorder with a cation redistribution toward a normal spinelconfiguration. The structural renormalization is consistent with the decreaseand increase in oscillator strength of respective electronic transitionsinvolving tetrahedrally (at $\sim$ 3.5 eV) and octahedrally (at $\sim$ 5.7 eV)coordinated Fe$^{3+}$ cations.

Control of Magnetic Order in Spinel ZnFe$_2$O$_4$ Thin Films Through Intrinsic Defect Manipulation