Navegação Ciências Exatas e da Terra por Autor "Baibich, Mario Norberto"
Resultados 1-20 de 20
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Co/ag multilayer film : role of annealing on the magnetic properties
(1992) [Artigo de periódico]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 ... -
Uma descoberta que mudou a forma de pensar ou como a ciência muda a humanidade
(2014) [Artigo de periódico]A partir da observação das mudanças introduzidas pela descoberta científica (no caso, a magnetorresistência gigante, de que participamos), tentamos retraçar os desenvolvimentos tecnológicos dos últimos anos. Mesmo sem ... -
Descrição da magnetoresistência faz 15 anos
(2003) [Artigo de periódico] -
Development of granular structure in Cu/sub 90/Co/sub 10/ ribbons through furnace and current annealing
(2000) [Artigo de periódico]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
(1981) [Artigo de periódico]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
(1988) [Artigo de periódico]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
(2002) [Artigo de periódico]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
(2016) [Artigo de periódico]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
(1992) [Artigo de periódico]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
(1998) [Artigo de periódico]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
(2017) [Artigo de periódico]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
(2007) [Artigo de periódico]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
(2000) [Artigo de periódico]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%
(1998) [Artigo de periódico]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
(1992) [Artigo de periódico]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
(2003) [Artigo de periódico]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
(2013) [Artigo de periódico]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
(2002) [Artigo de periódico]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
(1983) [Artigo de periódico]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
(1982) [Artigo de periódico]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 ...
