Spin Valve
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Comparison of computed amplitudes of magnetoresistance in spin-valve structures with wafer probe measurements
A code has been developed based on the semi-classical theory of giant magnetoresistance of Camley and Barnas [l]. It computes the sheet conductance and magnetoresistance of spin-valve structures. The input parameters are phenomenological transport parameters (mean-free paths and reflection/transmission coefficients at interfaces). These parameters are fairly
Publicado em: 2011
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2. Acoplamentos magnÃticos em bicamadas e vÃlvulas de spin: dependÃncia com a temperatura
Nesta dissertaÃÃo desenvolvemos atividades de fabricaÃÃo de filmes compostos de multicamadas magnÃticas, caracterizaÃÃo de suas propriedades e interpretaÃÃo fenomenolÃgica dos resultados. Investigamos os efeitos de acoplamentos magnÃticos que ocorrem em bicamadas do tipo ferromagneto/antiferromagneto (FM/AF) e em estruturas do tipo vÃlvulas de sp
Publicado em: 2009
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3. Spin valve effect and hall resistance in a wide parabolic well
We report observation of the Hall slope change in wide Al cGa1-cAs parabolic wells in the presence of a quasi-parallel magnetic field. Above the critical magnetic field B > 4T, the Hall resistance becomes temperature dependent and can be described by equation Rxy/costheta ~ (B-B0)/en s, where n s is the electron density, B0=2-2.6 T and theta is the angle bet
Brazilian Journal of Physics. Publicado em: 2006-06
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4. "Spin and magnetic properties of the III-V group semiconductors" / "Propriedades magnéticas e de spin em semicondutores do grupo III-V"
We present the results of our investigations concerning MBE grown AlGaAs/GaAs parabolic quantum well (PQW) samples. We focused on the variation of the Landé g factor along the structure of the PQWs, which occur as a consquence of its dependence on the Al content on the alloy AlGaAs. The implications are studied by Hall and Shubnikov-de Haas measurements. Sh
Publicado em: 2006
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5. MagnetoresistÃncia em filmes e multicamadas magnÃticas
In this master dissertation, we have studied, at room temperature, magnetic and transport properties of metallic films and multilayer of different structures such as: single layer thin films, coupled trilayer, ferromagnetic/antiferromagnetic bilayer and spin valve. Phenomenological models, which take in account the most relevant magnetic free energy terms, w
Publicado em: 2005
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6. RessonÃncia ferromagnÃtica em vÃlvulas de spin e relaxaÃÃo em filmes de permalloy / RessonÃncia ferromagnÃtica em vÃlvulas de spin e relaxaÃÃo em filmes de permalloy
In this dissertation it has been investigated the dynamic properties of spin-valves and the relaxation mechanism in thin Permalloy films. All measurements reported here were obtained at room temperature, using a homemade ferromagnetic resonance (FMR) setup, working in the X-band regime of frequency. The spin-valve structures Si(001)/NiO(900Ã)/Py(100Ã)/Cu(t
Publicado em: 2003
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7. Plastid Alternative Oxidase (PTOX) Promotes Oxidative Stress When Overexpressed in Tobacco
Photoinhibition and production of reactive oxygen species were studied in tobacco plants overexpressing the plastid terminal oxidase (PTOX). In high light, these plants was more susceptible to photoinhibition than wild-type plants. Also oxygen-evolving activity of isolated thylakoid membranes from the PTOX-overexpressing plants was more strongly inhibited in
American Society for Biochemistry and Molecular Biology.
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8. Morphological evaluation of atrioventricular septal defects by magnetic resonance imaging.
Twelve patients aged between 2 weeks and 22 months (median 6 weeks) with atrioventricular septal defects were examined with a 1.5 T, whole body, magnetic resonance imaging system. Ten patients had a common atrioventricular orifice (complete defect) while two patients had separate right and left valve orifices (partial defect). Associated cardiac malformation
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9. Evolution of the ventricles.
We studied the evolution of ventricles by macroscopic examination of the hearts of marine cartilaginous and bony fish, and by angiocardiography and gross examination of the hearts of air-breathing freshwater fish, frogs, turtles, snakes, and crocodiles. A right-sided, thin-walled ventricular lumen is seen in the fish, frog, turtle, and snake. In fish, there