Nanostructure‐enhanced magnetoelectric/magnetostrictive properties and reduced losses in self‐assembled epitaxial CuFe₂O₄–BiFeO₃ layers on Pb(Mg_1/3Nb_2/3)O₃–33at%PbTiO₃ crystals

Abstract

Self‐assembled two‐phase heterostructures of BiFeO3 and CuFe2O4 (BFO–CuFO) were deposited on (100)‐oriented SrRuO3‐buffered Pb(Mg1/3Nb2/3) O3–33at%PbTiO3 (PMN–PT) by using switching pulsed laser deposition (SPLD), and compared to single layers of CuFO on the same single crystal substrate. The CuFO phase of the self‐assembled layers had notably slimmer M‐H loops than for previously reported vertically integrated CoFe2O4 nanopillar ones, but wider ones than for CuFO/PMN–PT heterostructures. Notable changes in the magnetization of the CuFO nanopillars were found with applied DC electric field (EDC), where Mr/Ms exhibited typical butterfly‐shaped hysteresis with EDC. This was in distinct difference to CuFO/PMN–PT heterostructures which did not exhibit magnetoelectric coupling. The findings demonstrate a trade‐off between magnetoelectric/magnetostrictive properties and loss that can be controlled by nanostructure features.

Self‐assembled patterned CoFe2O4‐SrRuO3 electrodes: Enhanced functional properties by polar nano‐regions reorientation

“…And, the PMN-30PT (200) peaks were around 44.99°, indicating mixed phases, similar to prior reports. 3,10 The peaks measured from XRD line scans corroborated with the SADP image by TEM, demonstrating good epitaxy of the heterostructures. Figure 1E shows a high-resolution TEM (HRTEM) image in the vicinity of a CFO nanopillar.…”

Magnetoelectricity in vertically aligned nanocomposites: Past, present, and future

“…By control of the morphology of ME VANs, one can then tune the magnetic anisotropy from out-of-plane to in-plane direction. [25][26][27][28] Furthermore, ME VANs have enhanced ME properties, compared to ME heterostructural thin films. 5,22,29,30 This yields field tunable ME properties with either E or H (see Figure 1h), offering ME VANs potential for E-tunable inductors and H-tunable capacitors.…”

“…5,22,29,30 This yields field tunable ME properties with either E or H (see Figure 1h), offering ME VANs potential for E-tunable inductors and H-tunable capacitors. 26,31 S i n c e t h e f i r s t r e p o r t o f BiTiO 3 -CoFe 2 O 4 (BTO-CFO) VANs in 2004, many other VAN systems with different combinations of perovskite and spinel phases have been reported, such as PbTiO 3 -CoFe 2 O4 (PTO-CFO), 32,33 34,35 and BiFeO 3 -NiFe 2 O 4 (BFO-NFO). 36 To provide a universal and distinct understanding of ME VANs, the BFO-CFO based VAN system is chosen as an example in this article, whereas ME VANs with other compositions and the material selection strategies can be found in some recent reviews.…”

“…By utilizing FSPLD, there is no need to fabricate targets of different components and volume fractions. 24,26,28,37,38 target is switching fast enough, the thickness of individual phase layers will be so thin that the multilayer thin films will self-assemble into two-phase mixed VAN structure because the latter has lower formation energy. 28,37,38 By choosing various targets and controlling the ablation time, one can conveniently adjust the components and volume fractions in VANs.…”

Ab initio investigation of electronic and magnetic properties of antiferromagnetic/ferroelectric LaMnO3/BaTiO3 interface

“…Another material synthesized by Gajeket al [12] is ferroelectromagnet La 0.1 Bi 0.9 MnO 3 , which retains its properties down to 2 nm thick film. Due to the extraordinary challenge of creating multiferroic compounds, it was essential to create superlattice multicomponent materials as more efficient [13,14]. Moreover, the discovery of a quasi-two-dimensional electron gas properties in LaAlO 3 /SrTiO 3 heterostructures has stimulated intense research activity in the last fifteen years and provided new functionality for electronic devices [15,16].…”