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Now showing items 21-24 of 24
Estrutura de platô na magnetização em modelos de spins frustrados
(Universidade Federal de São Carlos, 2012-10-26)
This thesis study the phase transition, forms classical and quantum models of spin frustration. The Heisenberg model of spin 1/2 with exchange anisotropy with competitive interactions between first (J1) and second (J2) ...
Propriedades magneto-óticas e de magneto-transporte de um diodo de tunelamento ressonante contendo Si δ - doping no poço quântico
(Universidade Federal de São Carlos, 2011-03-11)
In this work, we have studied the transport and optical properties of GaAs = AlGaAs resonant tunneling diodes with Si delta-doping at the center of the quantum well. We have studied magneto-transport and polarized resolved ...
Domínios ferroelétricos em cerâmicas e materiais nanoestruturados: investigação por microscopia de piezoresposta
(Universidade Federal de São Carlos, 2011-12-07)
In this work, ferroelectric domain structure was investigated by Piezoresponse Force Microscopy (PFM). To this, an Atomic Force Microscope (AFM) has been modified to use it as PFM at room temperature and at high temperatures. ...
Análise de transformações de fases nas ligas Ti-35Nb-7Zr e Ti-xNb-3Fe por espectroscopia mecânica
(Universidade Federal de São Carlos, 2013-11-14)
In recent decades the study of β-Titanium alloys are attracting the interest to the biomaterials science community in general, since have improved properties as compared with current commercial biomedical alloys which ...