Nanolamellar magnetoelectric BaTiO3–CoFe2O4 bicrystal

Ren, Shenqiang; Laver, Mark; Wuttig, Manfred
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p153504
Academic Journal
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 mV/Oe 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 <[variant_greek_epsilon]r>-1d[variant_greek_epsilon]r/dH≈10-2. Since the material can be produced by standard ceramic processing methods, the discovery represents great potential for magnetoelectric devices


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