Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 4, Pages 2263-2268Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am506089c
Keywords
magnetoelectric coupling; templated self-assembly; vertically aligned nanocomposites; piezo-response force microscopy; magnetic force microscopy; conductive AFM
Funding
- National Science Foundation
- FAME, a Semiconductor Research Corporation program - MARCO
- DARPA
- CMSE [NSF0819762]
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Self-assembled BiFeO3-CoFe2O4 nanocomposites were templated into ordered structures in which the ferrimagnetic CoFe2O4 pillars form square arrays of periods 60-100 nm in a ferroelectric BiFeO3 matrix. The ferroelectricity, magnetism, conductivity, and magnetoelectric coupling of the ordered nanocomposites were characterized by scanning probe microscopy. The insulating BiFeO3 matrix exhibited ferroelectric domains, whereas the resistive CoFe2O4 pillars exhibited single-domain magnetic contrast with high anisotropy due to the magnetoelasticity of the spinel phase. Magnetoelectric coupling was observed in which an applied voltage led to reversal of the magnetic pillars.
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