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Competing Interface and Bulk Effect-Driven Magnetoelectric Coupling in Vertically Aligned Nanocomposites.

Aiping Chen1, Yaomin Dai1, Ahmad Eshghinejad2

  • 1Center for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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PubMed
Summary
This summary is machine-generated.

Vertically aligned nanocomposites show strong room-temperature magnetoelectric coupling, surpassing multilayers. Interface area and material properties control this effect, offering new avenues for functional materials.

Keywords:
epitaxialinterfacesmagnetoelectric couplingsnanocompositesstrain

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Room-temperature magnetoelectric (ME) coupling is achieved in artificial multilayers and nanocomposites.
  • While studied in multilayers, ME coupling in vertically aligned nanocomposites (VANs) remains largely unexplored.
  • Theory predicts VANs offer significantly larger ME coupling coefficients than multilayer structures.

Purpose of the Study:

  • To investigate and report strong transverse and longitudinal ME coupling in epitaxial BaTiO3:CoFe2O4 VANs.
  • To explore the mechanisms governing ME coupling in VANs, focusing on interfacial effects.
  • To provide physical insights into vertical interface coupling applicable to various nanocomposites.

Main Methods:

  • Fabrication of epitaxial BaTiO3:CoFe2O4 vertically aligned nanocomposites (VANs).
  • Measurement of ME coupling using optical second harmonic generation and piezoresponse force microscopy under magnetic fields.
  • Phase field simulations to analyze the dependence of ME coupling on interfacial area and pillar size.

Main Results:

  • Strong transverse and longitudinal magnetoelectric coupling was observed in the BaTiO3:CoFe2O4 VANs.
  • ME coupling strength was found to be highly dependent on the vertical interfacial area, controlled by pillar size.
  • The coupling is governed by a competition between vertical interface coupling and bulk volume conservation effects.

Conclusions:

  • Vertically aligned nanocomposites exhibit significant room-temperature magnetoelectric coupling.
  • The interface area and interplay between interface/bulk effects are critical for optimizing ME coupling in VANs.
  • The findings offer general physical insights into vertical interface coupling for diverse nanocomposite functionalities.