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Autor Crespo del Arco, Patricia |
Documentos disponibles escritos por este autor (39)
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Crespo del Arco, Patricia ; Marín, P. ; Hernando Grande, Antonio | American Institute of Physics | 2000-05-01We present experimental results on the hysteresis and relaxation of Fe/Ba hexaferrite composite samples prepared by ball milling starting from precursor Fe and Ba hexaferrite particles. Our results show that, for maximum applied fields of up to [...]texto impreso
Prados, C. ; Crespo del Arco, Patricia ; González, J. M. ; Hernando Grande, Antonio ; Marcos, J. F. ; Gancedo, R. ; Grobert, N. ; Terrones, M. ; Walton, R. M. ; Kroto, H. W. | American Physical Society | 2002-03-15The phase distribution of high aspect ratio, Fe-filled carbon nanotubes prepared by pyrolyzing a mixture of powered ferrocene and C_(60) has been determined by means of Mössbauer spectroscopy. Our results for that characterization are closely re[...]texto impreso
Litran, R. ; Sampedro, B. ; Rojas,, T. C. ; Multigner, M. ; Sánchez López, J. C. ; Crespo del Arco, Patricia ; López Cartes, C. ; García, M. A. ; Hernando Grande, Antonio ; Fernández, A. | American Physical Society | 2006-02Palladium nanoparticles capped with different protective systems in a size range between 1.2 and 2.4 nm have been obtained by varying the preparation chemical method. Magnetization curves for all the samples show hysteresis loops, evidencing a f[...]texto impreso
Rivero, G. ; Crespo del Arco, Patricia ; Pulido, E ; Garcia-Escorial, A. ; Hernando Grande, Antonio ; Vázquez, M. ; Vallet, M. ; Gonzalez-Calbet, J. | American Institute of Physics | 1991-04-15The specific magnetic moment, coercive force, anisotropy field, and saturation magnetostriction constant have been measured in Co(1-x)P(x) amorphous ribbons with 0.04 less-than-or-equal-to x less-than-or-equal-to 0.27. Differential scanning calo[...]texto impreso
Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Yavari, R ; Drbohlav, O. ; Garcia Escorial, A. ; Barandiaran, J. M. ; Orue, I. | American Physical Society | 1993-09-01A ferromagnetic and supersaturated fcc Fe_51Cu_49 solid solution has been obtained by mechanical alloying. After subsequent thermal treatments the fcc phase undergoes a spinodal decomposition which finally, at 780 K, yields a mixture of fcc and [...]texto impreso
Garcia, N. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Bovier, C. ; Serughetti, J. ; Bovier, C. ; Duval, E. | American Physical Society | 1993-01-01We have studied the magnetic properties of Cu-doped porous silica gels and found that the system seems to be ferromagnetic up to room temperature. This result is fascinating because the amount of Cu ranges from 0.15% to 3% in weight of the total[...]texto impreso
De la Venta, J. ; Fernandez Pinel, E. ; García, M. A. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Rodríguez de la Fuente, Óscar ; De Julián Fernández, C ; Fernández, A ; Penadés, S. | World Scientific Publ Co Pte Ltd | 2007-03-10We review here our recent results of experimental observation of room temperature magnetism in gold nanoparticles (NPs) and thin. films. Capping gold surfaces with certain organic molecules leads to the appearance of magnetism at room temperatur[...]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
Guerrero, E. ; Munoz-Marquez, M. A. ; Fernández, A. ; Crespo del Arco, Patricia ; Hernando, A. ; Lucena, R. ; Conesa, J. C. | American Institute of Physics | 2010-03-15In the last years, the number of studies performed by wholly independent research groups that confirm the permanent magnetism, first observed in our research lab, for thiol-capped Au nanoparticles (NPs) has rapidly increased. Throughout the year[...]texto impreso
Harris, V. G. ; Das,, B.N. ; Woicik, J. C. ; Crespo del Arco, Patricia ; Hemando, A. ; Garcia Escorial, A. | Editions Physique | 1997-04A least-square fitting analysis of EXAFS data collected from partially-crystallized Fe_80B_20 thin films (t=15 nm), using data collected from pure phase standards of the crystallization products, was found effective in determining the relative a[...]texto impreso
Hernando Grande, Antonio ; Crespo del Arco, Patricia ; Escorial Garcia, A. ; Barandiaran, J. M. | American Physical Society | 1993-05-31In conclusion we have proven that the fact that both fcc FeCu and bcc Fe magnetization agree at 300 K is simply an accident and our data at low temperature show clearly that the Fe contribution after precipitation from the metastable phase has a[...]texto impreso
Hernando Grande, Antonio ; Crespo del Arco, Patricia ; García, M. A. | Hindawi Publishing Corporation | 2005-12In this paper, we reviewed some relevant aspects of the magnetic properties of metallic nanoparticles with small size ( below 4 nm), covering the size effects in nanoparticles of magnetic materials, as well as the appearance of magnetism at the[...]texto impreso
Kirkland, J. P. ; Woicik, J. C. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Garcia Escorial, A. | American Physical Society | 1996-08-01Extended x-ray-absorption fine-structure (EXAFS) measurements were used to obtain element- specific, structural, and chemical information of the local environments around Cu and Fe atoms in high-energy ballmilled Cu_Fe_(12-X) samples (x=0.50 and[...]texto impreso
Hernando Grande, Antonio ; Crespo del Arco, Patricia ; Garcia, M.A. | American Physical Society | 2006-02-10The origin of orbital magnetism recently observed in different nanostructured films and particles is discussed as a consequence of spin-orbit coupling. It is shown that contact potentials induced at the thin film surface by broken symmetries, as[...]texto impreso
Presa Muñoz del Toro, Patricia de la ; Luengo, Y. ; Velasco, V. ; Morales, P. M. ; Iglesias, M. ; Veintemillas-Verdaguer, S. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio | Amer Chemical Soc | 2015-05-21The influence of magnetic interactions in assemblies formed by either aggregated or disaggregated uniform gamma-Fe_2O_3 particles are investigated as a function of particle size, concentration, and applied field. Hyperthermia and magnetization m[...]