title: Strain and Ferroelectric-Field Effects Co-mediated Magnetism in (011)-CoFe2O4/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 Multiferroic Heterostructures.
abstract: Electric-field mediated magnetism was investigated in CoFe2O4 (CFO, deposited by reactive cosputtering under different oxygen flow rates) films fabricated on (011)-Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (PMN-PT) substrates. Ascribed to the volatile strain effect of PMN-PT, the magnetization of the CFO films decreases along the [01-1] direction whereas it increases along the [100] direction under the electric field, which is attributed to the octahedron distortion in the spinel ferrite. Moreover, a nonvolatile mediation was obtained in the CFO film with low oxygen flow rate (4 sccm), deriving from the ferroelectric-field effect, in which the magnetization is different after removing the positive and negative fields. The cooperation of the two effects produces four different magnetization states in the CFO film with low oxygen flow rate (4 sccm), compared to the only two different states in the CFO film with high oxygen flow rate (10 sccm). It is suggested that the ferroelectric-field effect is related to the oxygen vacancies in CFO films.
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Chao
authors.initials: C
authors.lastname: Jin
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Dongxing
authors.initials: D
authors.lastname: Zheng
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Junlu
authors.initials: J
authors.lastname: Gong
authors.affiliation: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955, Kingdom of Saudi Arabia.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University , Tianjin 300354, P.R. China.
authors.forename: Haili
authors.initials: H
authors.lastname: Bai
keywords: CoFe2O4 films; ferroelectric-field effect; multiferroic heterostructures; oxygen vacancy; strain