Nanolamellar Magnetoelectric BaTiO3-CoFe2O4 Bicrystal
CALIFORNIA INST OF TECH PASADENA
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Here, we report a spontaneously formed nanolamellar BaTiO3-CoFe2O4 bicrystal. 110 interfaces join the BaTiO3 and CoFe2O4 single crystalline periodically arranged lamellae that have a common 111 direction. The superlattice of approximately 2 nm wavelength is magnetoelectric with a frequency dependent coupling coefficient of 20 mVOe cm at 100 Hz. The BaTiO3 component is a ferroelectric relaxor with a Vogel-Fulcher temperature of 311 K. The relaxor behavior gives rise to a magnetic tunability of the relative dielectric constant E sub r to the -1 dEsub rdH is approximately 10 to the -2. Since the material can be produced by standard ceramic processing methods, the discovery represents great potential for magnetoelectric devices.
- Electricity and Magnetism
- Solid State Physics