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De Oliveira L.A.S.,University of Campinas | Sinnecker J.P.,Brazilian Center for Research in Physics (CBPF) | Grossinger R.,Vienna University of Technology | Penton-Madrigal A.,University of Habana | Estevez-Rams E.,Institute Ciencia Y Tecnologia Of Materiales Imre
Journal of Magnetism and Magnetic Materials | Year: 2011

We investigate the influence of Cu substitution, on the coercivity and magnetic viscosity, in the ternary system GdCo5-xCux (x=0, 0.5, 1, 1.5, 2 and 2.5) with different field sweep rates. All samples have been studied in the as cast state and crystallize in a single phase CaCu5 structure. With Cu addition, the coercivity was 10 times enhanced for x =1.5. The behavior of the coercivity Hc against field sweep rate, dH/dt, shows that the GdCo5-xCux system exhibits only a small magnetic viscosity effect, a desirable property for magnetic dynamic applications under high magnetic field. © 2011 Elsevier B.V. Source

Penton-Madrigal A.,University of Habana | De Oliveira L.A.S.,University of Campinas | Sinnecker J.P.,Brazilian Center for Research in Physics (CBPF) | Souza D.M.,Brazilian Center for Research in Physics (CBPF) | And 4 more authors.
Physica B: Condensed Matter | Year: 2013

Magnetic measurements, X-ray diffraction and scanning electron microscopy (SEM) experiments were carried out in the as-cast Gd(Co1-x Cux)5 samples with different Co/Cu content. Already in the as cast state, this system shows high coercive field for x=0.3 and a magnetization driven by nucleation of reversal domain. SEM micrograph and microanalysis show possible spinodal decomposition in the as-cast state, hence regions with different Co/Cu-content are observed, while the Gd-content almost does not change. High resolution X-ray diffraction patterns show a main CaCu5-type structure with traces of a secondary phase and distorted peak profiles as function of the Cu content. The evolution of the microstructure is discussed in relation with the Cu incorporation into the CaCu 5-type structure. The Cu addition avoids the formation of the 2:7 phase within the 1:5 matrix, favoring the formation of a more homogeneous Gd(Co,Cu)5 phase. The relation between the observed microstructure and the magnetic behavior is also discussed. © 2013 Elsevier B.V. All rights reserved. Source

Blanco A.,Institute Ciencia Y Tecnologia Of Materiales Imre | Duran A.,Institute Ciencia Y Tecnologia Of Materiales Imre | Jimenez-Jorquera C.,Institute Microelectronica Of Barcelona Imb Cnm | Arias-De Fuentes O.,Institute Ciencia Y Tecnologia Of Materiales Imre
Journal of Physics: Conference Series | Year: 2013

FET based microsensors have reached increasing importance in biomedical and environmental applications, due to their advantages over conventional sensors. These advantages are related with their small size, robustness, low cost, integrability, fast response time, and the small sample volumes required for their use. In this work, it is presented the design and implementation of a portable instrumentation system based on the CY8C29466 (PSoC) microcontroller for the measurement of ISFETs and CHEMFETs type microsensors in liquid samples. The system shows the measurement's data on a display, also allowing storage of data for further analysis by coupling the system to a PC serial port. Source

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