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Quesada, A. ; García, M. A. ; Andrés, M. ; Hernando Grande, Antonio ; Fernandez, J. F. ; Caballero, A. C. ; Martín González, M. S. ; Briones, F. | American Institute of Physics | 2006-12The origin of ferromagnetism in diluted magnetic semiconductors is still an open question, yielding a great deal of research across the world. This work focuses on the Co-Zn-O system. Room-temperature ferromagnetism is observed after a partial r[...]texto impreso
García, M. A.. ; Ruiz González, M. L. ; Quesada, A. ; González Calbet, J. M. ; Hernando Grande, Antonio | American Physical Society | 2005-06-03In this Letter, we experimentally show that the room temperature ferromagnetism in the Mn-Zn-O system recently observed is associated with the coexistence of Mn^(3+) and Mn^(4+) via a double-exchange mechanism. The presence of the ZnO around MnO[...]texto impreso
Garcia, M.A. ; Fernandez Pinel, E. ; Quesada, A. ; De la Venta, M. L. ; Crespo del Arco, Patricia ; LLopis, J. ; Hernando Grande, Antonio | Amer Chemical Soc | 2007-06We experimentally show that it is possible to induce room-temperature ferromagnetic-like behavior in ZnO nanoparticles without doping with magnetic impurities but simply inducing an alteration of their electronic configuration. Capping ZnO nanop[...]texto impreso
Garcia March, M. A. ; Jimenez Villacorta, F. ; Quesada, A. ; De la Venta, J. ; Carmona Tejero, Noemi ; Lorite, I. ; LLopis, J. ; Fernandez, J. F. | American Institute of Physics | 2010-01-15We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co_3O_4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic str[...]
