Abstract:
:BiFeO3 is one of the most promising multiferroic materials but undergoes two major drawbacks: low dielectric susceptibility and high dielectric loss. Here we report high in-plane dielectric permittivity (ε' ∼2500) and low dielectric loss (tan δ < 0.01) obtained on Bi0.95Y0.05FeO3 films epitaxially grown on SrTiO3 (001) by pulsed laser deposition. High resolution transmission electron microscopy and geometric phase analysis evidenced nanostripe domains with alternating compressive/tensile strain and slight lattice rotations. Nanoscale mixed phase/domain ensembles are commonly found in different complex materials with giant dielectric/electromechanical (ferroelectric/ relaxors) or magnetoresistance (manganites) response. Our work brings insight into the joined role of chemical pressure and epitaxial strain on the appearance of nanoscale stripe structure which creates conditions for easy reorientation and high dielectric response, and could be of more general relevance for the field of materials science where engineered materials with huge response to external stimuli are a highly priced target.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Scarisoreanu ND,Craciun F,Birjega R,Ion V,Teodorescu VS,Ghica C,Negrea R,Dinescu Mdoi
10.1038/srep25535subject
Has Abstractpub_date
2016-05-09 00:00:00pages
25535issn
2045-2322pii
srep25535journal_volume
6pub_type
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