title: Applying Capacitive Energy Storage for In Situ Manipulation of Magnetization in Ordered Mesoporous Perovskite-Type LSMO Thin Films.
abstract: Mesostructured nonsilicate materials, particularly mixed-metal oxides, are receiving much attention in recent years because of their potential for numerous applications. Via the polymer-templating method, perovskite-type lanthanum strontium manganese oxide (La1-xSrxMnO3, LSMO, with x ≈ 0.15 to 0.30) with a continuous 3D cubic network of 23 nm pores is prepared in thin-film form for the first time. Characterization results from grazing incidence X-ray scattering, X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and electron microscopy and tomography show that the dip-coated sol-gel-derived films are of high quality in terms of both composition and morphology and that they are stable to over 700 °C. Magnetic and magnetotransport measurements demonstrate that the material with the highest strontium concentration is ferromagnetic at room temperature and exhibits metallic resistivity behavior below 270 K. Besides, it behaves differently from epitaxial layers (e.g., enhanced low-field magnetoresistance effect). It is also shown that carriers (electrons and holes) can be induced into the polymer-templated mesostructured LSMO films via capacitive double-layer charging. This kind of electrostatic doping utilizing ionic liquid gating causes large relative changes in magnetic susceptibility at room temperature and is a viable technique to tune the magnetic phase diagram in situ.
authors.forename: Christian
authors.initials: C
authors.lastname: Reitz
authors.forename: Di
authors.initials: D
authors.lastname: Wang
authors.affiliation: Department of Chemistry, University of Marburg , Hans-Meerwein-Straße, 35032 Marburg, Germany.|Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, 35392 Giessen, Germany.
authors.forename: Daniela
authors.initials: D
authors.lastname: Stoeckel
authors.forename: Andre
authors.initials: A
authors.lastname: Beck
authors.affiliation: Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, 35392 Giessen, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Leichtweiss
authors.affiliation: Helmholtz Institute Ulm for Electrochemical Energy Storage, Helmholtzstraße 11, 89081 Ulm, Germany.
authors.forename: Horst
authors.initials: H
authors.lastname: Hahn
authors.forename: Torsten
authors.identifier: http://orcid.org/0000-0002-4336-263X
authors.initials: T
authors.lastname: Brezesinski
keywords: block copolymer templating; double-layer charging; electrolyte gating; lanthanum strontium manganese oxide; mesoporosity; perovskite; tuning of magnetism