Vacancies' effect on the ferroelectric and magnetic response of Eu‐doped Bi 0.85 Pr 0.15 Fe 0.97 Mn 0.03 O 3 thin films
Year: 2023
Type: article
Abstract: Polycrystalline‐multiferroic Bi 0.85 Pr 0.15‐x Eu x Fe 0.97 Mn 0.03 O 3 (0, 0.01, 0.02, 0.03, 0.4, 0.05) thin films were grown on fluorine‐doped tin oxide (FTO)/glass substrate with radio frequency (RF) magnetron sputtering. Rietveld quantitative analysis reveals that whereas the starting materials (nanoparticles [NPs] and ceramics) are composed of tetragonal symmetry, the thin films can lose 80% of this symmetry to become rhombohedral symmetry. The structure evolution from tetragonal to rhombohedral symmetry indicates that the Eu 3+ ion acts positively to reduce the tensile residual stress component from 24 to 1.8 MPa in the thin films. The band gap shifts to 2.17 eV by Eu substitution at the A‐site of the perovskite. Scanning electron microscopy (SEM) results show high‐elongated nanocrystals that share parallel facets without porosity. In that morphology, the Eu has a strong influence on reducing the magnetic coercivity from 10.7 to 6.5 kOe, which has been interpreted in terms of local shape anisotropy. Although the magnetic response increases monotonously, the ferroelectric polarization decreases with doping. These changes are explained through local defects created by the evolution of the concentration that changes significantly by Eu doping.
Source: Surface and Interface Analysis
DOI: 10.1002/sia.7216
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4367394377