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Keywords:

  • charge modulation;
  • polarization modulation;
  • oxide interface;
  • ABF STEM;
  • monochromated EELS
Thumbnail image of graphical abstract

Charge and polarization modulations in Fe3O4 are controlled by taking advantage of interfacial strain effects. The feasibility of oxidation state control by strain modification is demonstrated and it is shown that this approach offers a stable configuration at room temperature. Direct evidence of how a local strain field changes the atomic coordination and introduces atomic displacements leading to polarization of Fe ions is presented.