Navegação por Assunto "Magnetização"
Resultados 21-40 de 73
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Estudo de propriedades magnéticas de filmes finos de cobalto sobre Si(111)
(2003) [Dissertação]O crescimento de lmes nos ferromagnéticos sobre uma superfícies vicinal induz uma anisotropia uniaxial que atua juntamente com a anisotropia magnetocrislanina. Neste estudo, lmes nos de Co foram depositados sobre Si(111) ... -
Estudo de sistemas magnéticos policristalinos através da equação de Landau–Lifshitz–Gilbert
(2014) [Trabalho de conclusão de graduação]A equação da dinâmica da magnetização, proposta por Landau e Lifshitz, é amplamente utilizada e é a base de muitos estudos de simulações de sistemas magnéticos. Neste trabalho, apresentamos uma revisão teórica dos conceitos ... -
Estudo do efeito de transferência de spin
(2011) [Dissertação]A ideia de transferência de spin, como forma de controle da magnetização, foi introduzida independentemente por Slonczewski e por Berger em 1996. Desde então, esse efeito tem sido alvo de inúmeras pesquisas, em especial ... -
Exact results for the thermal and magnetic properties of strong coupling ladder compounds
(2003) [Artigo de periódico]We investigate the thermal and magnetic properties of the integrable su (4) ladder model by means of the quantum transfer matrix method. The magnetic susceptibility, specific heat, magnetic entropy, and high field magnetization ... -
Exchange bias through a Cu interlayer in an IrMn/Co system
(2007) [Artigo de periódico]Ferromagnetic resonance FMR and magnetization MAG measurements were used to study the exchange interaction between the antiferromagnetic and ferromagnetic layers in an IrMn/Cu/Co system as a function of the Cu spacer ... -
Fases orientacionais em sistemas com interações competitivas pelo método do aglomerado variacional
(2015) [Tese]Nesta tese estudamos um modelo de spins do tipo Ising, modelo J1 J2, com interações competitivas J1 ferromagnéticas entre primeiros vizinhos na rede quadrada e J2 antiferromagnética entre segundos vizinhos. O diagrama ... -
Fenomenologia crítica e correntes AC nos sistemas magnéticos reentrantes σ-Fe-C, σ-Fe-V e Au-Fe
(2011) [Tese]Este trabalho consiste de um estudo da fenomenologia crítica nas vizinhanças da temperatura de Curie (TC) das ligas binárias reentrantes s-Fe1-xCrx, onde x = 0,46 e 0,49; s-Fe0,52V0,48 e Au1-yFey, onde y = 0,135; 0,15; ... -
Fenomenologia crítica em sistemas magnéticos reentrantes
(2010) [Tese]Neste trabalho apresentamos um estudo experimental sobre a fenomologia critica nas proximidades da temperatura de Curie, Tc, de sistemas magnéticos reentrantes. Tais sistemas se caracterizam pela ocorrência de uma fase ... -
Ferromagnetic resonance in ag coupled ni films
(1993) [Artigo de periódico]We present an X-band ferromagnetic resonance (FMR) study of polycrystalline single Ni films and of two Ni layers separated by an Ag layer at room temperature. Films were deposited by sputtering on glass using Ag over- and ... -
Frequency-dependent exchange bias in NiFe/NiO films
(2003) [Artigo de periódico]Ferromagnetic (FM) resonance and magnetization curve measurements were performed at room temperature for a polycrystalline Ni81Fe19 coupled to NiO. It was observed that the shape of the angular variation of the resonance ... -
High field paramagnetic effect in YBCO single crystals with different oxygen contents
(2014) [Trabalho completo publicado em evento] -
Impact of magnetization easy-axis distributions on the ferromagnet-antiferromagnet exchange-coupling estimation
(2008) [Artigo de periódico]It is frequently reported that different measurement techniques may yield distinct values for the exchange anisotropy, being the difference of up to one order of magnitude on comparing magnetization loop with ac susceptibility ... -
Inductive Observation of Transitions from [100] Magnetic Domains to [010] and [001] in Silicon-Iron
(1985) [Artigo de periódico]Transitions of the magnetization from the [100] to [010] and [001] directions were observed by inductive methods. Enhancement of the signals was obtained by a crossed excitation-signal windings arrangement. The results are ... -
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 ... -
Influence of segmentation of ring-shaped NdFeB magnets with parallel magnetization on cylindrical actuators
(2014) [Artigo de periódico]This work analyses the effects of segmentation followed by parallel magnetization of ring-shaped NdFeB permanent magnets used in slotless cylindrical linear actuators. The main purpose of the work is to evaluate the effects ... -
Inhomogeneous structure and magnetic properties of granular Co/sub 10/Cu/sub 90/ alloys
(2001) [Artigo de periódico]Granular Co₁₀Cu₉₀ alloys displaying giant magnetoresistance have been obtained by melt spinning followed by an appropriate heat treatment in the range 0–700 °C. Their structural and magnetic properties have been studied ... -
In situ magnetization measurements of Cu/Co multilayers during the process of electrodeposition
(2001) [Artigo de periódico]The electrocrystallization of Cu–Co multilayers has been investigated by means of in situ magnetization measurements, during the electrodeposition, using an electrochemical alternating gradient magnetometer. The hysteresis ... -
Interconnection between zero resistance and magnetic irreversibility temperatures in the hole doped Y0.9Ca0.1Ba2Cu3O7-δ single crystal
(2014) [Trabalho completo publicado em evento] -
Inverse spin-valve-type magnetoresistance in spin engineered multilayered structures
(1994) [Artigo de periódico]The resistivity of magnetic multilayers is generally smaller when the magnetizations of successive layers are parallel, which is the so-called giant magnetoresistance or spin-valve effect. We have been able to reverse this ... -
Irreversibility limits of the Abrikosov and Josephson flux dynamics in homogeneous and granular high-T/sub c/ superconductors
(2001) [Artigo de periódico]The magnetic irreversibility of a high-quality YBa₂Cu₃O₇₋₈ single crystal and of the granular superconductors YBa₁.₅Sr₀.₅Cu₃O₇₋₈ and YBa₁.₇₅Sr₀.₂₅Cu₃O₇₋₈ single crystals and the polycrystalline YBa₁.₇₅Sr₀.₂₅Cu₃O₇₋₈ sample ...