Browsing Exact and Earth Sciences by Author "Gomes, Affonso Augusto Guidão"
Now showing items 1-4 of 4
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Barkhausen noise in the reentrant system Ni(1-X) Mn(x) : a study of the power spectra
Sommer, Rubem Luis; Schmidt, Joao Edgar; Gomes, Affonso Augusto Guidão (1993) [Journal article]In this article, the power spectra of the Barkhausen noise of Ni1-x Mnx is presented. The measurements were made in the ferromagnetic phase at several temperatures and manganese concentrations in order to map the effects ... -
Co/ag multilayer film : role of annealing on the magnetic properties
Schelp, Luiz Fernando; Tosin, Giancarlo; Carara, Marcos Andre; Baibich, Mario Norberto; Gomes, Affonso Augusto Guidão; Schmidt, Joao Edgar (1992) [Journal article]Co( 15 A)/Ag(60 A) multilayers produced by electron beam deposition on a 50 A chromium buffer layer over a Si( 111) wafer have been studied by magnetoresistance, saturation magnetization, coercivity, and anisotropy. Annealing ... -
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) [Journal article]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 ... -
Laves-phase pseudobinaries a(fe1-xbx)2 (a=zr,hf;b=al,si): some structural and magnetic properties
Silva, Celso Arami Marques da; Schmidt, Joao Edgar; Livi, Flavio Pohlmann; Gomes, Affonso Augusto Guidão (1991) [Journal article]The lattice parameters and the saturation magnetization are measured for the series of intermetallic compounds A(Fe,B)2 A = Zr, Hf and B = Si and Al, with concentrations less than 15%. The magnetization measurements and ...