Now showing items 1-18 of 18

    • 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 ...
    • Development of granular structure in Cu/sub 90/Co/sub 10/ ribbons through furnace and current annealing 

      Silva, F.C.S.; Knobel, Marcelo; Ferrari, Edson Fernando; Denardin, Juliano C.; Miranda, Marines Grande Malcum; Bracho Rodriguez, Gustavo Jesus; Antunes, Arlei Borba; Baibich, Mario Norberto (2000) [Journal article]
      On-line measurements of resistance and temperature in melt-spun Cu90Co10 ribbons are made using two different annealing techniques: conventional furnace annealing, and linearly varying current Joule heating. The aim of ...
    • Electrical Resistance and Crystallization Characteristics of Fe/Sub 80/B/Sub 20/a 

      Baibich, Mario Norberto; Muir, W.B.; Van Wyck, D.R. (1981) [Journal article]
      The electrical resistance of amorphous Fe80B20 has been measured as a function of time at various temperatures during an isothermal crystallization process. The results fit a universal curve when ∆R/∆R1 is plotted against ...
    • Giant magnetoresistance of (001)fe/(001)cr magnetic superlattices 

      Baibich, Mario Norberto; Broto, Jean Marc; Fert, Albert R.; Dau, F. Nguyen van; Petroff, Frédéric; Etienne, P.; Creuzet, G.; Friederich, A.; Chazelas, J. (1988) [Journal article]
      We have studied the magnetoresistance of (001)Fe/(001)Cr superlattices prepared by molecular-beam epitaxy. A huge magnetoresistance is found in superlattices with thin Cr layers: For example, with tCr=9 Å, at T =4.2 K, the ...
    • Hopping conductivity in one-dimensional Ca/sub 3/Co/sub 2/O/sub 6/ single crystals 

      Raquet, Bertrand; Baibich, Mario Norberto; Broto, Jean Marc; Rakoto, Harison; Lambert, Sébastien; Maignan, Antoine (2002) [Journal article]
      We studied the electronic conductivity and magnetic properties of quasi-one-dimensional Ca₃Co₂O₆ single crystals. The results evidence a variable range hopping conductivity with temperature-induced crossover between ...
    • Influence of sample width on the magnetoresistance and planar Hall effect of Co/Cu multilayers 

      Lima, Saulo Cordeiro; Baibich, Mario Norberto (2016) [Journal article]
      We have studied Co/Cu multilayers to understand the effect of the sample’s width on their magnetoresistance (MR). By keeping constant both the length and the thickness and exploring the widths within the range of usual ...
    • In situ electrical resistivity of thin-film beta-nial under ar irradiation at 77 k 

      Costa, Jose Antonio Trindade Borges da; Vasconcellos, Marcos Antonio Zen; Teixeira, Sergio Ribeiro; Scherer, Claudio; Baibich, Mario Norberto (1992) [Journal article]
      We report on the dose dependence of the in sítu electrical resistivity of a thin-film NiAl alloy under 120-keV-Ar-ion irradiation at 77 K. The results show two different behaviors. First, the values of resistivity increase, ...
    • Kinectics of ion-induced transformations in β-NiAl thin films as characterized by in situ electrical resistivity measurements 

      Miranda, Rosalvo Mario Nunes; Vasconcellos, Marcos Antonio Zen; Baibich, Mario Norberto; Costa, Jose Antonio Trindade Borges da (1998) [Journal article]
      In situ electrical resistivity of thin film B-NiAl at 77 K under 120 keV Ar1 irradiation has been measured as a function of the total dose for film thickness of 25, 37.5, 50, 62.5, and 75 nm. A qualitative change was ...
    • Kondo-like behavior and GMR effect in granular Cu90Co10 microwires 

      Zhukova, Valentina A.; Miňo, Jakub; Del Val, Juan José; Varga, Rastislav; Martinez Pino, Gerardo Guido; Baibich, Mario Norberto; Ipatov, Mihail; Zhukov, Arkady (2017) [Journal article]
      We observed a significant increase of the giant magnetoresistance (GMR) effect (up to 32% after the adequate annealing) and Kondo-like behavior in Cu90Co10 glass-coated microwires. Observed enhancement of the GMR effect ...
    • Low potential barrier height effects in magnetic tunneling junctions 

      Cruz de Gracia, Evgeni Svenk; Dorneles, Lucio Strazzabosco; Schelp, Luiz Fernando; Teixeira, Sergio Ribeiro; Baibich, Mario Norberto (2007) [Journal article]
      This paper reports on the study of deposited (Ni81Fe19/AlOx /Co) magnetic tunnel junctions by magnetron sputtering, with the insulating layer obtained by plasma oxidation of Al. Concentration of the tunnel current in small ...
    • Magnetization dynamics as derived from magneto impedance measurements 

      Carara, Marcos Andre; Baibich, Mario Norberto; Sommer, Rubem Luis (2000) [Journal article]
      In this work, the magnetization dynamics of soft magnetic materials is studied with the aid of transverse differential permeability μ(Iac , f ,Hdc) spectra. Contributions to the magnetization processes from domain wall ...
    • Magnetization process and magnetoimpedance in (110)[001]FeSi/Sub 3% 

      Carara, Marcos Andre; Gundel, Andre; Baibich, Mario Norberto; Sommer, Rubem Luis (1998) [Journal article]
      The present article investigates the relation between magnetoimpedance (MI) and the evolution of the magnetic domain structure along the magnetization curves of commercial FeSi3% sheets cut at different angles with respect ...
    • Oscillatory interlayer coupling and magnetoresistance in magnetic metallic multilayers 

      Baibich, Mario Norberto; Muniz, R.B. (1992) [Journal article]
      The oscillations of the interlayer exchange coupling and the giant magnetoresistance effect in magnetic metallic multilayers have been intensively investigated both experimentally and theoretically. The current status of ...
    • Phase separation in Cu/sub 90/Co/sub 10/ high-magnetoresistance materials 

      Miranda, Marines Grande Malcum; Estevez Rams, Ernesto; Martinez Pino, Gerardo Guido; Baibich, Mario Norberto (2003) [Journal article]
      The relation between giant magnetoresistance ~GMR! and phase separated nanostructures in Cu90Co10 is studied using magnetotransport measurements together with transmission electron microscopy and x-ray microanalysis. The ...
    • A simple formulation for magnetoresistance in metal-insulator granular films with increased current 

      Boff, Marco Aurelio Silveira; Canto, B.; Baibich, Mario Norberto; Pereira, Luis Gustavo (2013) [Journal article]
      We studied the tunnel magnetoresistance in metal/insulator granular films when the applied current is varied. The tunnel magnetoresistance shows a strong modification related to a non-Ohmic behaviour of theses materials. ...
    • Stress level in finemet materials studied by impedanciometry 

      Carara, Marcos Andre; Baibich, Mario Norberto; Sommer, Rubem Luis (2002) [Journal article]
      In this work, a study of the stress relief in Finemet ribbons, Fe73.5Cu1Nb3Si16.5B6, as a function of the annealing temperature is presented. The as melt-spun samples are amorphous and become partially crystallized after ...
    • Thermopower and resistivity in amorphous Cu(1-x) Zr(x) alloys 

      Baibich, Mario Norberto; Muir, W.B.; Altounian, Z.; Guo-Hua, Tu (1983) [Journal article]
      The thermopower and resistivity of a series of Cu1-xZrx alloys have been measured between 2 and 300 K for O. 3 < x <O. 7. The composition dependence of the results cannot be explained on the basis of the simple Ziman ...
    • Thermopower and resistivity in amorphous Mg/sub 1-x/Zn/sub x/ alloys 

      Baibich, Mario Norberto; Muir, W.B.; Altounian, Z.; Guo-Hua, Tu (1982) [Journal article]
      Thermopower and resistivity have been measured on a series of Mg1-xZnx amorphous alloys (0.2<X<0.35) over the temperature range 4-300 K. The thermopower data cannot be explained on the basis of the simple Ziman model. Using ...