5 research outputs found
Ferromagnetic-like behavior of Bi0.9La0.1FeO3-KBr nanocomposites
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 is
rather small (less than 15 wt percent) 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 15percent, 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 BLFO
ceramics, 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. An appropriate
mechanism turned out to be ferro-magneto-ionic coupling.Comment: 24 pages, 4 figures in the main text, and supplement with 4 figure