Abstract: We studied magnetostatic response of the Bi0.9La0.1FeO3– KBr composites (BLFO-KBr) consisting of nanosized (≈100 nm) ferrite Bi0.9La0.1FeO3 (BLFO) conjugated with fine grinded ionic conducting KBr. When the fraction of KBr is rather small (less than 15 wt%) the magnetic response of the composite is very weak and similar to that observed for the BLFO (pure KBr matrix without Bi1-xLaxFeO3 has no magnetic response as anticipated). However, when the fraction of KBr increases above 15%, the magnetic response of the composite changes substantially and the field dependence of magnetization reveals ferromagnetic-like hysteresis loop with a remanent magnetization about 0.14 emu/g and coercive field about 1.8 Tesla (at room temperature). Nothing similar to the ferromagnetic-like hysteresis loop can be observed in Bi1-zLazFeO3 ceramics with z ≤ 0.15, which magnetization quasi-linearly increases with magnetic field. Different physical mechanisms were considered to explain the unusual experimental results for BLFO-KBr nanocomposites, but only those among them, which are highly sensitive to the interaction of antiferromagnetic Bi0.9La0.1FeO3 with ionic conductor KBr, can be relevant.


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

Authors: D.V. Karpinsky,  O.M. Fesenko,  M.V. Silibin, S.V. Dubkov, M. Chaika, A. Yaremkevich, A. Lukowiak, Y. Gerasymchuk, W. Stręk, A. Pakalniškis, R. Skaudzius, A. Kareiva, Y.M. Fomichov, V.V. Shvartsman, S.V. Kalinin, N.V. Morozovsky, A.N. Morozovska 

DOI: https://doi.org/10.1038/s41598-019-46834-0  Scientific Reports (2019) 9, 10417

Preprint deposited in the repository: https://arxiv.org/abs/1901.08913