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Structure and magnetism in the Zn–Mn–O system: A candidate for room temperature ferromagnetic semiconductor

AuthorsFernández Lozano, José Francisco ; Caballero Cuesta, Amador ; Villegas, Marina; Khatib, S. J. ; Bañares González, Miguel Ángel; García Fierro, José Luis ; Costa Krämer, José Luis ; López-Ponce, Enrique ; Martín-González, Marisol; Briones Fernández-Pola, Fernando ; Quesada, Adrián ; García, Miguel Ángel Pérez; Hernando, Antonio
KeywordsPowders-solid state reaction
X-ray methods
Magnetic properties
Room temperature ferromagnetic semiconductors
Issue Date2006
CitationJournal of the European Ceramic Society 26(14): 3017-3025 (2006)
AbstractThe reactivity of the Zn–Mn–O system, prepared by conventional ceramic routes using ZnO and MnO2 as starting materials are described and correlated with the magnetic response. X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy techniques have been used for the structural analysis. The ferromagnetic response is unambiguously determined to be due to the simultaneous presence of Mn+3 and Mn+4 ions at the Zn diffusion front into the manganese oxide grain. Thus, it is demonstrated that Mn does not incorporate into the ZnO lattice substitutionally, but it is the Zn that diffuses into the manganese oxide grains, acting as a retardant of the manganese reduction, Mn+4 → Mn+3. At the diffusion front, both ions coexist and their spins couple ferromagnetically through a double exchange mechanism. This mechanism explains the origin of the room temperature ferromagnetism recently discovered in Zn–Mn–O system as a promising material for spintronic devices.
Description9 páginas, 10 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1016/j.jeurceramsoc.2006.02.021
Appears in Collections:(ICV) Artículos
(ICP) Artículos
(IMN-CNM) Artículos
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