Competing Interface and Bulk Effect–Driven Magnetoelectric Coupling in Vertically Aligned Nanocomposites
- Center for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Mechanical Engineering University of Washington Seattle WA 98195 USA
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Quantum and Energy Materials International Iberian Nanotechnology Laboratory Braga 4715‐330 Portugal
- MPA‐CMMS Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Rd. Cambridge CB3 OFS UK
- Department of Materials Design and Innovation University at Buffalo—The State University of New York Buffalo NY 14260 USA
Room-temperature magnetoelectric (ME) coupling is developed in artificial multilayers and nanocomposites composed of magnetostrictive and electrostrictive materials. Although the coupling mechanisms and strengths in multilayers are widely studied, they are largely unexplored in vertically aligned nanocomposites (VANs), even though theory has predicted that VANs exhibit much larger ME coupling coefficients than multilayer structures. In this work, strong transverse and longitudinal ME coupling in epitaxial BaTiO3:CoFe2O4 VANs measured by both optical second harmonic generation and piezoresponse force microscopy under magnetic fields is reported. Phase field simulations have shown that the ME coupling strength strongly depends on the vertical interfacial area which is ultimately controlled by pillar size. The ME coupling in VANs is determined by the competition between the vertical interface coupling effect and the bulk volume conservation effect. The revealed mechanisms shed light on the physical insights of vertical interface coupling in VANs in general, which can be applied to a variety of nanocomposites with different functionalities beyond the studied ME coupling effect.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1568924
- Alternate ID(s):
- OSTI ID: 1558226; OSTI ID: 1568925
- Report Number(s):
- LA-UR-19-27192; 1901000
- Journal Information:
- Advanced Science, Journal Name: Advanced Science Vol. 6 Journal Issue: 19; ISSN 2198-3844
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
Web of Science
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