Exploration of artificial multiferroic thin-film heterostructures using composition spreads

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 magnetoelectric thin-film heterostructures. Scanning microwave microscopy 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.

[1]  R Ramesh,et al.  Multiferroic BaTiO3-CoFe2O4 Nanostructures , 2004, Science.

[2]  S. Dong,et al.  Ultrahigh magnetic field sensitivity in laminates of TERFENOL-D and Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals , 2003 .

[3]  R. Ramesh,et al.  Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures , 2003, Science.

[4]  Jing Zhu,et al.  Size effect and fatigue mechanism in ferroelectric thin films , 2002 .

[5]  M. Wuttig,et al.  Magnetoelectric coupling in Terfenol-D/polyvinylidenedifluoride composites , 2002 .

[6]  Ichiro Takeuchi,et al.  Multimode quantitative scanning microwave microscopy of in situ grown epitaxial Ba1−xSrxTiO3 composition spreads , 2001 .

[7]  Gopalan Srinivasan,et al.  Magnetoelectric bilayer and multilayer structures of magnetostrictive and piezoelectric oxides , 2001 .

[8]  A. V. Carazo,et al.  Magnetoelectric Properties in Piezoelectric and Magnetostrictive Laminate Composites , 2001 .

[9]  J. Horwitz,et al.  Uniaxial dielectric anisotropy in Ba0.5Sr0.5TiO3 films studied by evanescent-probe microscopy , 2001 .

[10]  G. Hu,et al.  Structural tuning of the magnetic behavior in spinel-structure ferrite thin films , 2000 .

[11]  Marco Avellaneda,et al.  Magnetoelectric Effect in Piezoelectric/Magnetostrictive Multilayer (2-2) Composites , 1994 .

[12]  E. M. Lifshitz,et al.  Electrodynamics of continuous media , 1961 .

[13]  D. Boerma,et al.  MATERIALS ISSUES FOR TUNABLE RF AND MICROWAVE DEVICES III , 2002 .

[14]  Susan Trolier-McKinstry,et al.  The Properties of Ferroelectric Films at Small Dimensions , 2000 .

[15]  J. V. D. Boomgaard,et al.  Magnetoelectricity in piezoelectric-magnetostrictive composites , 1976 .

[16]  J. V. D. Boomgaard,et al.  Piezoelectric-piezomagnetic composites with magnetoelectric effect , 1976 .

[17]  G. Slemon.  Magnetoelectric Devices: Transducers, Transformers and Machines , 1966 .