title: Magnetization Reversal by Out-of-plane Voltage in BiFeO3-based Multiferroic Heterostructures.
abstract: Voltage controlled 180° magnetization reversal has been achieved in BiFeO3-based multiferroic heterostructures, which is promising for the future development of low-power spintronic devices. However, all existing reports involve the use of an in-plane voltage that is unfavorable for practical device applications. Here, we investigate, using phase-field simulations, the out-of-plane (i.e., perpendicular to heterostructures) voltage controlled magnetism in heterostructures consisting of CoFe nanodots and (110) BiFeO3 thin film or island. It is predicted that the in-plane component of the canted magnetic moment at the CoFe/BiFeO3 interface can be reversed repeatedly by applying a perpendicular voltage across the bottom (110) BiFeO3 thin film, which further leads to an in-plane magnetization reversal in the overlaying CoFe nanodot. The non-volatility of such perpendicular voltage controlled magnetization reversal can be achieved by etching the continuous BiFeO3 film into isolated nanoislands with the same in-plane sizes as the CoFe nanodot. The findings would provide general guidelines for future experimental and engineering efforts on developing the electric-field controlled spintronic devices with BiFeO3-based multiferroic heterostructures.
authors.affiliation: State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: J J
authors.initials: JJ
authors.lastname: Wang
authors.affiliation: 1] State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China [2] Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Hu
authors.affiliation: State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: Ren-Ci
authors.initials: RC
authors.lastname: Peng
authors.affiliation: State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.affiliation: State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.affiliation: 1] State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China [2] Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA.
authors.forename: L Q
authors.initials: LQ
authors.lastname: Chen
authors.affiliation: State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
authors.forename: C W
authors.initials: CW
authors.lastname: Nan