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Domínguez-Adame Acosta, Francisco ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; De Diego, N. ; LLopis, J. ; Moser, P. | Editions Physique | 1989-06Positron annihilation (PA) is a sensitive technique for detection of vacancy-type defects in crystals, that has been widely used in recent years to study defects in semiconductors (1). On the other side, CL and other luminescence techniques have[...]texto impreso
Carmona Tejero, Noemi ; Bouzas, V. ; Jiménez, F. ; Plaza, M. ; Pérez García, Lucas ; García, M. A. ; Villegas, M. A. ; LLopis, J. | Elsevier Science S A | 2010-03-04Optical absorption and magnetic properties of silica sol-gel monoliths doped with cobalt starting from different precursors and water/1-propanol molar ratios are investigated. Structural characterization of the sol-gel by X-ray absorption near-e[...]texto impreso
Carmona Tejero, Noemi ; LLopis, J. ; Ruiz González, M. Luisa ; Gonzalez-Calbet, José M. | American Physical Society | 2010-08-11We present here direct experimental evidence of the magnetic polarization of Zn atoms in ZnO nanoparticles capped with different materials by means of x-ray magnetic circular dichroism (XMCD). Our results demonstrate that the magnetism in this m[...]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
Serrano, A., A. ; Plaza, M. ; Pérez García, Lucas ; Venta, J. de la ; LLopis, J. ; García, M. A. | American Physical Society | 2009-04We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO? and Co?O? powders despite the antiferromagnetic and diamagnetic characters of both oxides, respectively. The ferromagnetic behavior is found in the early stages o[...]texto impreso
Urchulutegui, M. ; Piqueras de Noriega, Javier ; LLopis, J. | American Institute of Physics | 1989-04-01The capability of scanning electron?acoustic microscopy in the characterization of MgO crystals has been studied. The conditions for the observation of different surface and subsurface features in as?grown and deformed crystals are described and[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier ; De Diego, N. ; LLopis, J. | American Institute of Physics | 1988-04-15Cathodoluminescencescanning electron microscopy and positron annihilation techniques have been used to investigate the distribution of defects in GaP wafers. The results show the existence of a gradient of the concentration of vacancy?type defec[...]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[...]
