We have fabricated a series of composition spreads consisting of ferroelectric BaTiO3 and piezomagnetic CoFe2O4 layers of varying thicknesses modulated at nanometer level in order to explore artificial magnetoelectricthin-film heterostructures. Scanning microwavemicroscopy and scanning superconducting quantum interference device microscopy were used to map the dielectric and magnetic properties as a function of continuously changing average composition across the spreads, respectively. Compositions in the middle of the spreads were found to exhibit ferromagnetism while displaying a dielectric constant as high as ≈120.
Published in Applied Physics Letters, Volume 84, Issue 16, 2004, pages #3091-.
©Applied Physics Letters 2004, AIP (American Institute of Physics).
Chang, K.-S., Aronva, M. A., Lin, C.-L., Murakami, M., Yu, M.-H., Hattrick-Simpers, J., Famodu, O. O., Lee, S. Y., Ramesh, R., Wuttig, M., Takeuchi, I., Gao, C., & Bendersky, L. A. (2004). Exploration of Artificial Multiferroic Thin-Film Heterostructures using Composition Spreads. Applied Physics Letters, 84 (16), #3091. http://dx.doi.org/10.1063/1.1699474