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We use density functional theory to calculate the structure, band-gap andmagnetic properties of oxygen-deficientSrTi$_{1-x-y}$Fe$_x$Co$_y$O$_{3-\delta}$ with x = y = 0.125 and ${\delta}$ =(0,0.125,0.25). The valence and the high or low spin-states of the Co and Feions, as well as the lattice distortion and the band-gap, depend on the oxygendeficiency, the locations of the vacancies, and on the direction of the Fe-Coaxis. A charge redistribution that resembles a self-regulatory response liesbehind the valence spin-state changes. Ferromagnetism dominates, and both themagnetization and the band gap are greatest at ${\delta}$ = 0.125. Thisqualitatively mimics the previously reported magnetization measured forSrTiFeO$_{3-\delta}$, which was maximum at an intermediate deposition pressureof oxygen.

Oxygen-vacancy tuning of magnetism in SrTi$_{0.75}$Fe$_{0.125}$Co$_{0.125}$O$_{3-\delta}$ perovskite