Navegação Ciências Exatas e da Terra por Autor "Fraga, Gilberto Luiz Ferreira"

Resultados 1-5 de 5

    • Heusler compounds : a brief review and some theoretical studies 

      Rocha, Fabio Saraiva da; Fraga, Gilberto Luiz Ferreira; Brandao, Delmar Estevam; Silva, Celso Arami Marques da; Gomes, Affonso Augusto Guidão (2000) [Artigo de periódico]
      In this review paper we briefly recali some existing experimental and theoretical work on the magnetic properties, specific heat and transport properties of pure and pseudo ternary Heusler compounds. Previous existing ...

    • Impedance and initial magnetic permeability of gadolinium 

      Fraga, Gilberto Luiz Ferreira; Pureur Neto, Paulo; Cardoso, Lisandro Pavie (2010) [Artigo de periódico]
      In the present work we report on measurements of the complex impedance and the magnetoimpedance of a textured sample of gadolinium metal. The preferential c -axis orientation of the Gd hexagonal structure is perpendicular ...

    • Impedance and initial magnetic permeability of the Heusler compounds Pd/sub 2/MnSn and Pd/sub 2/MnSb near the Curie temperature 

      Fraga, Gilberto Luiz Ferreira; Borba, Luciano Apellaniz; Pureur Neto, Paulo (2006) [Artigo de periódico]
      In this paper we report measurements of the complex impedance of the Heusler compounds Pd2MnSn and Pd2MnSb near the Curie temperature. From the experimental data, the complex initial magnetic permeability is obtained as a ...

    • Non-ohmic behavior of metal-insulator granular thin films in low-field regime (eDV kBT) 

      Boff, Marco Aurelio Silveira; Canto, B.; Mesquita, Fabiano; Hinrichs, Ruth; Fraga, Gilberto Luiz Ferreira; Pereira, Luis Gustavo (2016) [Artigo de periódico]
      Non-ohmic behavior is not expected in metal–insulator granular systems in a low-field regime. There is no model to explain this behavior, even though it has been reported in several metalinsulator granular thin films ...

    • Turn on of new electronic paths in Fe-SiO2 granular thin film 

      Boff, Marco Aurelio Silveira; Hinrichs, Ruth; Canto, B.; Mesquita, Fabiano; Baptista, Daniel Lorscheitter; Fraga, Gilberto Luiz Ferreira (2014) [Artigo de periódico]
      The electrical properties of Fe-SiO2 have been studied in the low-field regime (eDV kBT), varying the injected current and the bias potential. Superparamagnetism and a resistance drop of 4400X (for a voltage variation of ...