title: Structural and Magnetic Properties of LaCoO3/SrTiO3 Multilayers.
abstract: Structural and magnetic properties of the LaCoO3/SrTiO3 (LCO/STO) multilayers (MLs) with a fixed STO layer of 4 nm but varied LCO layer thicknesses have been systematically studied. The MLs grown on Sr0.7La0.3Al0.65Ta0.35O3 (LSAT) and SrTiO3 (STO) exhibit the in-plane lattice constant of the substrates, but those on LaAlO3 (LAO) show the in-plane lattice constant between those of the first two kinds of MLs. Compared with the LCO single layer (SL), the magnetic order of the MLs is significantly enhanced, as demonstrated by a very slow decrease, which is fast for the SL, of the Curie temperature and the saturation magnetization as the LCO layer thickness decreases. For example, clear ferromagnetic order is observed in the ML with the LCO layer of ∼1.5 nm, whereas it vanishes below ∼6 nm for the LCO SL. This result is consistent with the observation that the dark stripes, which are believed to be closely related to the magnetic order, remain clear in the MLs while they are vague in the corresponding LCO SL. The present work suggests a novel route to tune the magnetism of perovskite oxide films.
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Hongrui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Huaiwen
authors.initials: H
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Lan
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Deshun
authors.initials: D
authors.lastname: Hong
authors.affiliation: College of Physics Science and Technology, Hebei University , Baoding 071002, Hebei Province, People's Republic of China.
authors.forename: Shufang
authors.initials: S
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Xi
authors.initials: X
authors.lastname: Shen
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Tahira
authors.initials: T
authors.lastname: Khan
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Richeng
authors.initials: R
authors.lastname: Yu
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Jirong
authors.initials: J
authors.lastname: Sun
authors.affiliation: Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
authors.forename: Baogen
authors.initials: B
authors.lastname: Shen
keywords: HAADF image; ferromagnetic order; interlayer coupling; magnetic dead layer; multilayers; perovskite oxides