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We studied magnetostatic response of the Bi0.9La0.1FeO3-KBr composites(BLFO-KBr) consisting of nanosized (about 100 nm) ferrite Bi0.9La0.1FeO3 (BLFO)conjugated with fine grinded ionic conducting KBr. When the fraction of KBr israther small (less than 15 wt percent) the magnetic response of the compositeis very weak and similar to that observed for the BLFO (pure KBr matrix withoutBi1-xLaxFeO3 has no magnetic response as anticipated). However, when thefraction of KBr increases above 15percent, the magnetic response of thecomposite changes substantially and the field dependence of magnetizationreveals ferromagnetic-like hysteresis loop with a remanent magnetization about0.14 emu/g and coercive field about 1.8 Tesla (at room temperature). Nothingsimilar to the ferromagnetic-like hysteresis loop can be observed in BLFOceramics, which magnetization quasi linearly increases with magnetic field.Different physical mechanisms were considered to explain the unusualexperimental results for BLFO-KBr nanocomposites, but only those among them,which are highly sensitive to the interaction of antiferromagneticBi0.9La0.1FeO3 with ionic conductor KBr, can be relevant. An appropriatemechanism turned out to be ferro-magneto-ionic coupling.

Ferromagnetic-like behavior of Bi0.9La0.1FeO3-KBr nanocomposites