title: Selectable spontaneous polarization direction and magnetic anisotropy in BiFeO3-CoFe2O4 epitaxial nanostructures.
abstract: We demonstrate that epitaxial strain engineering is an efficient method to manipulate the ferromagnetic and ferroelectric properties in BiFeO(3)-CoFe(2)O(4) columnar nanocomposites. On one hand, the magnetic anisotropy of CoFe(2)O(4) is totally tunable from parallel to perpendicular controlling the CoFe(2)O(4) strain with proper combinations of substrate and ferroelectric phase. On the other hand, the selection of the used substrate allows the growth of the rhombohedral bulk phase of BiFeO(3) or the metastable nearly tetragonal one, which implies a rotation of the ferroelectric polar axis from [111] to close to the [001] direction. Remarkably, epitaxy is preserved and interfaces are semicoherent even when lattice mismatch is above 10%. The broad range of sustainable mismatch suggests new opportunities to assemble epitaxial nanostructures combining highly dissimilar materials with distinct functionalities.
authors.affiliation: Institut de Ciència de Materials de Barcelona-CSIC, Campus de la UAB, 08193 Bellaterra, Spain. ndix@icmab.es
authors.forename: Nico
authors.initials: N
authors.lastname: Dix
authors.forename: Rajaram
authors.initials: R
authors.lastname: Muralidharan
authors.forename: Jose-Manuel
authors.initials: JM
authors.lastname: Rebled
authors.forename: Sonia
authors.initials: S
authors.lastname: Estradé
authors.forename: Francesca
authors.initials: F
authors.lastname: Peiró
authors.forename: Manuel
authors.initials: M
authors.lastname: Varela
authors.forename: Josep
authors.initials: J
authors.lastname: Fontcuberta
authors.forename: Florencio
authors.initials: F
authors.lastname: Sánchez