title: Two-, three-, and four-component magnetic multilayer onion nanoparticles based on iron oxides and manganese oxides.
abstract: Magnetic multilayered, onion-like, heterostructured nanoparticles are interesting model systems for studying magnetic exchange coupling phenomena. In this work, we synthesized heterostructured magnetic nanoparticles composed of two, three, or four components using iron oxide seeds for the subsequent deposition of manganese oxide. The MnO layer was allowed either to passivate fully in air to form an outer layer of Mn(3)O(4) or to oxidize partially to form MnO|Mn(3)O(4) double layers. Through control of the degree of passivation of the seeds, particles with up to four different magnetic layers can be obtained (i.e., FeO|Fe(3)O(4)|MnO|Mn(3)O(4)). Magnetic characterization of the samples confirmed the presence of the different magnetic layers.
authors.affiliation: Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden. german@mmk.su.se
authors.forename: German
authors.initials: G
authors.lastname: Salazar-Alvarez
authors.forename: Hans
authors.initials: H
authors.lastname: Lidbaum
authors.forename: Alberto
authors.initials: A
authors.lastname: López-Ortega
authors.forename: Marta
authors.initials: M
authors.lastname: Estrader
authors.forename: Klaus
authors.initials: K
authors.lastname: Leifer
authors.forename: Jordi
authors.initials: J
authors.lastname: Sort
authors.forename: Santiago
authors.initials: S
authors.lastname: Suriñach
authors.forename: Maria Dolors
authors.initials: MD
authors.lastname: Baró
authors.forename: Josep
authors.initials: J
authors.lastname: Nogués