A theoretical investigation of the special properties of SrFe1−xCoxO3

► SrFe1−xCoxO3 exhibits half-metallic nature for 0.2≤x≤0.7 and full-metallic nature for other values of x. ► The half-metallic gap decreases with increasing x. ► The tunneling between half-metallic ferromagnetic phases drives the magnetoresistance.