title: Synthetic magnetoelectric coupling in a nanocomposite multiferroic.
abstract: Given the paucity of single phase multiferroic materials (with large ferromagnetic moment), composite systems seem an attractive solution to realize magnetoelectric coupling between ferromagnetic and ferroelectric order parameters. Despite having antiferromagnetic order, BiFeO3 (BFO) has nevertheless been a key material due to excellent ferroelectric properties at room temperature. We studied a superlattice composed of 8 repetitions of 6 unit cells of La0.7Sr0.3MnO3 (LSMO) grown on 5 unit cells of BFO. Significant net uncompensated magnetization in BFO, an insulating superlattice, is demonstrated using polarized neutron reflectometry. Remarkably, the magnetization enables magnetic field to change the dielectric properties of the superlattice, which we cite as an example of synthetic magnetoelectric coupling. Importantly, controlled creation of magnetic moment in BFO is a much needed path toward design and implementation of integrated oxide devices for next generation magnetoelectric data storage platforms.
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: P
authors.initials: P
authors.lastname: Jain
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Universidad Complutense de Madrid, Madrid Spain 28040.
authors.forename: M
authors.initials: M
authors.lastname: Roldan
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, TN 37831.
authors.forename: A
authors.initials: A
authors.lastname: Glavic
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, TN 37831.
authors.forename: V
authors.initials: V
authors.lastname: Lauter
authors.affiliation: University of California at San Diego, La Jolla CA 92093.
authors.forename: C
authors.initials: C
authors.lastname: Urban
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: Z
authors.initials: Z
authors.lastname: Bi
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: T
authors.initials: T
authors.lastname: Ahmed
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: J
authors.initials: J
authors.lastname: Zhu
authors.affiliation: 1] Universidad Complutense de Madrid, Madrid Spain 28040 [2] Oak Ridge National Laboratory, Oak Ridge, TN 37831.
authors.forename: M
authors.initials: M
authors.lastname: Varela
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: Q X
authors.initials: QX
authors.lastname: Jia
authors.affiliation: Los Alamos National Laboratory, Los Alamos NM 87545.
authors.forename: M R
authors.initials: MR
authors.lastname: Fitzsimmons