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Multicamadas de NiFe/FeMn com potencial de aplicação como sensores a altas frequências
(Universidade Federal de Santa Maria, 2016-02-12)
In this work we investigated the magnetization process and the magnetoimpedance in samples exhibiting exchange bias. Ni81Fe19=Fe50Mn50=T a bilayers and multilayers where
grown onto glass substrates. The exchange bias was ...
Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
(Universidade Federal de Santa Maria, 2018-07-20)
Devices based on effects that generate a dc voltage in ferromagnetic ressonance (FMR)
condition are of great interest for broadband communication applications, since they allow
the rectification of radio frequency signals ...
Estudo de exchange bias via magnetorresistência anisotrópica
(Universidade Federal de Santa Maria, 2013-08-15)
Anisotropic magnetoresistance (AMR) corresponds to the change of R in an ferromagnetic
material with the angle between electric current and magnetization. Sensors using this
effect are suited to detect both angular and ...
Magnetorresistência e correntes de spin em Multicamadas de Ni81Fe19/ZnO/Pd
(Universidade Federal de Santa Maria, 2017-03-02)
In this work, we analyzed samples of thin films Ni81Fe19 and Pd with ZnO spacer. Ni81Fe19
is a ferromagnet with a low saturation magnetic field. Pd is a normal metal with high spinorbit
coupling, much used in spin Hall ...
Dinâmica da magnetização em filmes finos de Co20Fe60B20
(Universidade Federal de Santa Maria, 2021-02-28)
In this work, it was realize a ferromagnetic resonance insvestigation in Co20Fe60B20 thin films with diferent thickness between 100 - 2000 nm. The hysteresis curves were obtained with a vibrating sample magnetometer. The ...
Caracterização de multicamadas de NiFe/FeMn para medidas de magnetoimpedância assimétrica abaixo de 2 GHz
(Universidade Federal de Santa Maria, 2018-11-13)
In this work the giant magnetoimpedance effect (GMI) was investigated in exchange biased
Ni81Fe19/Fe50Mn50 bilayers. The study samples were deposited on glass substrate
by magnetron sputtering. The exchange bias (EB) was ...
Transições de primeira ordem no modelo vidro de spin ising fermiônico em um campo transverso
(Universidade Federal de Santa Maria, 2006-10-31)
The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic ...
Modos quase-normais de buracos negros plano-simétricos anti-de sitter em d dimensões
(Universidade Federal de Santa Maria, 2007-08-22)
Quasinormal modes of plane-symmetric anti-de Sitter (AdS) black holes in d spacetime dimensions are investigated. Following the gauge invariant prescription developed by Kodama, Ishibashi and Seto (2000), fundamental ...
Filmes finos de óxidos de vanádio depositados por sputtering reativo
(Universidade Federal de Santa Maria, 2006-05-18)
We have produced thin film samples of vanadium oxide, with different stoichiometry, by reactive magnetron sputtering from a metallic vanadium target. The thickness of the samples were maintained under 100 nm and glass or ...
Efeitos de interações de terceiros vizinhos sobre a criticalidade do modelo de Ising quântico na rede quadrada frustrada
(Universidade Federal de Santa Maria, 2023-02-14)
In the present work, we investigate the phase transitions of the Ising model with interactions
between first (J1), second (J2) and third (J3) neighbours in the square lattice with transverse magnetic field. In this study, ...