Spin-inversion in a quantum ring with two magnetic impurities

► A quantum ring with two magnetic impurities enclosing a magnetic flux is considered. ► Spin-dependent transport properties of electron are studied using waveguide theory. ► The magnetic impurities initial triplet spin state is necessary for spin inversion. ► The proper conditions at which perfect spin-inversion occur are determined. ► The efficiency of spin-inverter is calculated for different conditions.