The coexistence of ferroelectric and magnetic orders in multiferroic
materials has evoked an enormous research in this frontier area
recently. The magnetic and ferroelectric coupling leads potential
application in new multifunctional devices [1–3]. In order to use the
multiferroic materials for applications, the magnetoelectric coupling
must be both large and active at room temperature. Among the
single-phase multiferroic materials, undoped Bismuth ferrite (BiFeO3
or BFO) and doped BFO have relatively high leakage current disrupting
the desirable ME coupling [4–6] at room temperature. In contrast,
multiferroic composites, which incorporate both ferroelectric and
ferri-/ferromagnetic phases, typically yield enhanced ME coupling at
room temperature [7–11]. In these ME composite systems, ME coupling is strain-mediated and the elastic coupling interaction leads to
giant magnetoelectric response.
Literature has revealed that when BFO is modified by BTO to form
the composite, the multiferroic properties may be enhanced and such
reports on BFO–BTO composites are also very limited. Recently Kumar
et al. [12], Buscaglia et al. [13], Chandarak et al. [14], Itoh et al. [15] and
Bennett et al. [16] have studied such systems. Their study involved
only undoped BFO for the synthesis of composites. When a chemically
modified BFO is added to BTO to prepare the composite, one can
expect better results as the doped BFO has been proved to exhibit improved results. Hence, we have investigated the multiferroic
properties of two such composites prepared by a solid state reaction method. The single phase multiferroic (Dy,Cu) – modified BFO
(BDFCO) and Dy modified BFO (BDFO) were prepared by a sol–gel
method. Then two composites, namely 0.85BDFCO–0.15BTO and 0.85
BDFO–0.15BTO, were prepared by the solid state reaction method and
their magnetic properties and the magnetoelectric coupling were
investigated.
The coexistence of ferroelectric and magnetic orders in multiferroicmaterials has evoked an enormous research in this frontier arearecently. The magnetic and ferroelectric coupling leads potentialapplication in new multifunctional devices [1–3]. In order to use themultiferroic materials for applications, the magnetoelectric couplingmust be both large and active at room temperature. Among thesingle-phase multiferroic materials, undoped Bismuth ferrite (BiFeO3or BFO) and doped BFO have relatively high leakage current disruptingthe desirable ME coupling [4–6] at room temperature. In contrast,multiferroic composites, which incorporate both ferroelectric andferri-/ferromagnetic phases, typically yield enhanced ME coupling atroom temperature [7–11]. In these ME composite systems, ME coupling is strain-mediated and the elastic coupling interaction leads togiant magnetoelectric response.Literature has revealed that when BFO is modified by BTO to formthe composite, the multiferroic properties may be enhanced and suchreports on BFO–BTO composites are also very limited. Recently Kumaret al. [12], Buscaglia et al. [13], Chandarak et al. [14], Itoh et al. [15] andBennett et al. [16] have studied such systems. Their study involvedonly undoped BFO for the synthesis of composites. When a chemicallymodified BFO is added to BTO to prepare the composite, one canexpect better results as the doped BFO has been proved to exhibit improved results. Hence, we have investigated the multiferroicproperties of two such composites prepared by a solid state reaction method. The single phase multiferroic (Dy,Cu) – modified BFO(BDFCO) and Dy modified BFO (BDFO) were prepared by a sol–gelmethod. Then two composites, namely 0.85BDFCO–0.15BTO and 0.85BDFO–0.15BTO, were prepared by the solid state reaction method andtheir magnetic properties and the magnetoelectric coupling wereinvestigated.
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