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Co2Sn1−xTxO4 (T = Al, Sc, and Y; 0 ≤ x ≤ 0.2) magnetic spinel oxides have been synthesized through solid-state reaction. The XRD pattern displays a single-phase cubic structure with space group Fd3m. Moreover, magnetic susceptibility results show that substituting trivalent non-magnetic ions improves the para-ferrimagnetic transition temperature, TC. Magnetic susceptibility results of direct current (dc) and alternating current (ac) showed that the T3+ substitution increased the freezing temperature of the spin-glass state, and was also beneficial to the growth of the spin-glass phase. The apparent magnetic exchange bias effect at low temperatures (T < 20 K) was realized in the Co2Sn1−xTxO4 samples using the pinning effect in the spin-glass phase. Due to the magnetic exchange bias effect, the magnetism of the system dramatically increased at low temperatures. Thermal exchange bias results show that the coercivity field (HC) at 10 K increased from 0 for x = 0 samples to ~ 2.1, 1.3, and 2.9 kOe for Al-, Sc-, and Y-doped samples, respectively. It can optimize magnetic materials and architectures, improving performance and practicality in magnetic data storage, magnetic sensors, spintronics, and magnetic nanoparticles. [ABSTRACT FROM AUTHOR]