title: Monolithic integration of room-temperature multifunctional BaTiO3-CoFe2O4 epitaxial heterostructures on Si(001).
abstract: The multifunctional (ferromagnetic and ferroelectric) response at room temperature that is elusive in single phase multiferroic materials can be achieved in a proper combination of ferroelectric perovskites and ferrimagnetic spinel oxides in horizontal heterostructures. In this work, lead-free CoFe2O4/BaTiO3 bilayers are integrated with Si(001) using LaNiO3/CeO2/YSZ as a tri-layer buffer. They present structural and functional properties close to those achieved on perovskite substrates: the bilayers are fully epitaxial with extremely flat surface, and exhibit robust ferromagnetism and ferroelectricity at room temperature.
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.|Dep. de Fisica, Universitat Autònoma de Barcelona, Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Mateusz
authors.initials: M
authors.lastname: Scigaj
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Nico
authors.initials: N
authors.lastname: Dix
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Jaume
authors.initials: J
authors.lastname: Gázquez
authors.affiliation: Dep. Física Aplicada III &Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid 28040, Spain.
authors.forename: María
authors.initials: M
authors.lastname: Varela
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.|Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
authors.forename: Ignasi
authors.initials: I
authors.lastname: Fina
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
authors.forename: Neus
authors.initials: N
authors.lastname: Domingo
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Gervasi
authors.initials: G
authors.lastname: Herranz
authors.affiliation: Dep. de Fisica, Universitat Autònoma de Barcelona, Campus UAB, Bellaterra 08193, Barcelona, Spain.|Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain.
authors.forename: Vassil
authors.initials: V
authors.lastname: Skumryev
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Josep
authors.initials: J
authors.lastname: Fontcuberta
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Barcelona, Spain.
authors.forename: Florencio
authors.initials: F
authors.lastname: Sánchez