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Up to now, for the conventional exchange bias (EB) systems there has been onepinning phase and one pinned phase, and the pinning and pinned phases areinherent to the material and do not mutually transform into each other.Interestingly, we show here that EB is observed in a special system(Fe2O3)0.1(FeTiO3)0.9 (HI9) different from the conventional EB system. Neutronpowder diffraction and magnetic measurement confirm that for HI9: i) two typesof short range antiferromagnetic ordering coexist, ii) there are two pinningphases and one pinned phase, iii) the pinned phase is not intrinsic to thestructure but can be dynamically produced from the pinning phase with the helpof an external magnetic field. Consequently, two anomalous EB behaviors areobserved: i) both the coercivity (HC) and the exchange bias field (HE)simultaneously decrease to zero at 30 K, ii) for a high cooling field (Hcool)HE decreases logarithmically with increasing Hcool. Using Arrott plots it isconfirmed that the first order magnetic phase transformation (FOMPT) from theAFM Fe2+ to ferromagnetic (FM) Fe2+ and the second order magnetic phasetransformation (SOMPT) for the process whereby the FM Fe2+ aligns with theexternal field direction coexist in HI-9. The Morin transition and FOMPT causethe anomalous EB behaviors. This work may provide fresh ideas for research intoEB behavior.

Dynamic magnetic-transformation-induced exchange bias in (Fe2O3)0.1-(FeTiO3)0.9