Abstract
A remarkable exchange bias effect arising from the temperature-dependent interaction among the ferromagnetic-like cluster glasses and antiferromagnetic regions was observed in a newly developed single-phase multiferroic compound of Bi10Fe6Ti3O30 which has a nine-layer Aurivillius structure. Inhomogeneous distribution of magnetic Fe ions inside this long-period layered structure was experimentally identified via the atomic level imaging. The results confirmed the presence of the short-range magnetic ordering (the cluster glassy state) and the canted antiferromagnetism, and then the direct interaction among them was further confirmed. Finding of this new single-phase material accompanying this remarkable exchange bias effect would be beneficial to both basic physics understanding and the potential device development.
Highlights
Chaotic ionic diffusion at the interface, which will highly restrict the realization of an efficient magnetization shift (ME) coupling
All peaks can be well indexed to our calculated peaks using the typical space group B2cb for odd layered Aurivillius oxides, and no impurity phases are detected under the current detection accuracy[17,19]
It distinctly captures that Fe/Ti atoms shift off the geometric centre of the neighboured four Bi atoms only along one corner direction
Summary
Chaotic ionic diffusion at the interface, which will highly restrict the realization of an efficient ME coupling. Layer structured Bi-containing Aurivillius oxides, a material class consisting of alternatively stacked fluorite-like (Bi2O2)2+ units and perovskites-like [Am−1BmO3m+1]2− blocks, have attracted much attention for the coexistence of FE and FM behaviors, with the potential well above the room temperature (RT)[15,16,17] Their non-centrosymmetric structure[18] and the inhomogeneous distribution of Fe/Ti ions inside the octahedral sites accompanying with their strong interactions via oxygen ions appear to play an important role in determining their fascinating coexisted or coupled FE and FM properties[19,20]. Structural analyses disclosed that the intrinsic structural disordering is most probably the microcosmic origin of the observe FM and FE performances inside this new complex oxide
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