Exchange bias in non-collinear spin-spiral system Co(Cr1−xCox)2O4(x=0.0–0.1)Co(Cr1−xCox)2O4(x=0.0–0.1)

• Observation of the exchange bias below lock-in transition (TLTL) in Co(Cr1−xCox)2O4Co(Cr1−xCox)2O4.
• Enhancement of exchange bias by “Co” substitution.
• Observation of possible correlation between the non-collinear spin-spirals, exchange bias and coercivity in Co(Cr1−xCox)2O4Co(Cr1−xCox)2O4.

We report structural and magnetic properties of Co(Cr1−xCox)2O4(x=0.0–0.1). The thermal hysteresis has been observed both across magnetostructural transition (TS) and lock-in transition (TL). We observe noticeable Exchange bias (EB) only below the lock-in transition, TL. The value of coercivity also shows the dramatical increase below TL. These results have been discussed in the context of incommensurate to commensurate non-collinear spin-spiral transitions across TL.