Interface Double-Exchange Ferromagnetism in the Mn-Zn-O System: New Class of Biphase Magnetism

In this Letter, we experimentally show that the room temperature ferromagnetism in the Mn-Zn-O system recently observed is associated with the coexistence of Mn3+ and Mn4+ via a double-exchange mechanism. The presence of the ZnO around MnO2 modifies the kinetics of MnO2→Mn2O3 reduction and favors th...

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Detalles Bibliográficos
Autores: Pérez García, Miguel Ángel, Ruiz-González, María Luisa, Quesada, Adrián, Costa Krämer, José Luis, Fernández Lozano, José Francisco, Khatib, S. J., Wennberg, A., Caballero Cuesta, Amador, Martín-González, Marisol, Villegas, Marina, Briones Fernández-Pola, Fernando, González-Calbet, José M., Hernando, Antonio
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/20601
Acceso en línea:http://hdl.handle.net/10261/20601
Access Level:acceso abierto
Palabra clave:Ferromagnetism
Thin film
Biphase Magnetism
Descripción
Sumario:In this Letter, we experimentally show that the room temperature ferromagnetism in the Mn-Zn-O system recently observed is associated with the coexistence of Mn3+ and Mn4+ via a double-exchange mechanism. The presence of the ZnO around MnO2 modifies the kinetics of MnO2→Mn2O3 reduction and favors the coexistence of both Mn oxidation states. The ferromagnetic phase is associated with the interface formed at the Zn diffusion front into Mn oxide, corroborated by preparing thin film multilayers that exhibit saturation magnetization 2 orders of magnitude higher than bulk samples.

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