Navegação Ciências Exatas e da Terra por Autor "Guimaraes, Renato Bastos"

Resultados 1-5 de 5

    • Dimensional crossover in magnetic warwickites 

      Guimaraes, Renato Bastos; Fernandes, Joao Carlos; Continentino, Mucio Amado; Borges, Hortencio A.; Moura, Cassio Stein; Cunha, Joao Batista Marimon da; Santos, Carlos Alberto dos (1997) [Artigo de periódico]
      We present an investigation of the magnetic properties of a series of warwickites with different transition metals. These materials are characterized by one-dimensional structures called ribbons where the transition metals ...

    • Implanted boron depth profiles in the az111 photoresist 

      Guimaraes, Renato Bastos; Amaral, Livio; Behar, Moni; Fichtner, Paulo Fernando Papaleo; Zawislak, Fernando Claudio (1988) [Artigo de periódico]
      The isotope 1OB has been implanted into the photoresist AZll1 in the 30–150 keV energy range. The corresponding depth profiles have been analyzed using the 1OB(n,a) 7 Li reaction. At 60 keV, the profile changes from a ...

    • Magnetic interactions in the ludwigite Ni/sub 2/FeO/sub 2/BO/sub 3/ 

      Fernandes, Joao Carlos; Guimaraes, Renato Bastos; Continentino, Mucio Amado; Borges, Hortencio A.; Sulpice, A.; Tholence, Jean-Louis; Siqueira, Jesumar Lopes; Zawislak, Luci Irene; Cunha, Joao Batista Marimon da; Santos, Carlos Alberto dos (1998) [Artigo de periódico]
      We present an investigation of the magnetic properties of the ludwigite Ni2FeO2BO3. This material is an oxyborate that presents in its crystalline structure subunits in the form of walls where the transition metal ions are ...

    • Range and thermal behavior studies of Au and Bi implanted into photoresist films 

      Behar, Moni; Grande, Pedro Luis; Amaral, Livio; Kaschny, Jorge Ricardo de Araujo; Zawislak, Fernando Claudio; Guimaraes, Renato Bastos; Biersack, J.P.; Fink, Dietmar (1990) [Artigo de periódico]
      The Rutherford backscattering technique has been used to determine range parameters of Au and Bi íons implanted into AZ1350 photoresist films at energies from 20 to 300 keV. The experimental results are 20 to 25% higher ...

    • Range measurements and thermal stability study of az111 photoresist implanted with bi ions 

      Guimaraes, Renato Bastos; Amaral, Livio; Behar, Moni; Zawislak, Fernando Claudio; Fink, Dietmar (1988) [Artigo de periódico]
      The Rutherford backscattering technique has been used to determine the range parameters of Bi ions implanted into AZ111 photoresist film at energies from 10 to 400 keY. An overaU good agreement is found between the ...