Abstract
It is shown theoretically that applying magnetic fields can modulate the strength of ionic bonds on the surface of a ferroelectric film via field-induced strains from a magnetostrictive substrate. The ionic bonds form between oppositely charged polyelectrolytes that are bonded to the ferroelectric surface via the Coulomb interaction. The calculations show that applying a magnetic field can tune the activation energy of bond dissociation up by ∼50% or down to zero. This large modulation results from the high sensitivity of ferroelectric surface polarization to strain variation near ferroelectric phase transitions, which occur in epitaxial BaTiO3 films at experimentally accessible residual strains. Our results suggest an opportunity for tailoring the ionic bond strength on ferroelectric surfaces both statically and dynamically via strain engineering.
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