Spin glass and exchange bias effect in one-dimensional frustrated compound Ca3CoMnO6.

• A spin glass freezing peak was observed in Ca 3 CoMnO 6 around T f = 172 K. • The results suggest the co-existence of competing short range AFM and FM order. • The short-range spin order can be suppressed effectively by external field. • Due to the competing AFM and FM interaction, exchange bias effect was observed. Rhombohedral structural Ca 3 CoMnO 6 was prepared. The microstructure, chemical composition, morphology were checked and the magnetic properties were investigated in detail. Due to the "order-by-disorder" phenomenon, the ZFC curve presents negative susceptibility in low temperature region. Besides the antiferromagnetic transition around T N = 13.5 K, another abnormal peak around T f = 172 K was also observed. The shift of the abnormal peak towards low temperature with the field increases, magnetic relaxation experiment and the training effect confirm the freezing spin glass characteristic. The broadening of the freezing peak in higher field can be well explained by the reduction of short-range magnetic correlation length. Due to the competing antiferromagnetic and ferromagnetic interactions, obvious exchange bias effect was observed. [ABSTRACT FROM AUTHOR]