Colossal Magnetoresistance
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Preparation and characterization of La,Pr)CaMnO manganites / Preparação e caracterização de manganitas (La,Pr)CaMnO
Amostras policristalinas de La(5/8-y)Pr(y)Ca(3/8)MnO(3); 0 y 0.625; foram produzidas pelo método da mistura estequiométrica de óxidos e tratadas termicamente ao ar a 1400 oC. As amostras foram caracterizadas através de medidas de difração de raios-X, resistividade elétrica rho(T), susceptibilidade magnética chi(T) e magnetorresistividade rho(T, H = 5
Publicado em: 2005
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2. Estrutura local em manganitas por espectroscopia de absorção de raios-X
Transition metal oxides with perovskite structure ABO3, exhibit large diversity of interesting physical properties and have recently been the subject of a great number of studies. The manganites, AMnO3, in particular, may exhibit colossal magneto-resistance, a phenomenon strongly related to the formal valency of the Mn ions and to structural local order arou
Publicado em: 2004
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3. Efeitos de tensão em filmes finos de manganitas estudados por espectroscopia de absorção de raios-X com luz linearmente polarizada
Among the materials exhibiting the Colossal Magnetoresistance e effect, mixed manganite thin films have received special attention due to their potential applications for new generation magneto-eletronic devices. In these systems, the external biaxial strain could be used to tune the magnetism and transport properties if it were possible to settle the exact
Publicado em: 2003
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4. Propriedades magneticas de manganitas, fitas amorfas e filmes finos com anisotropia unidirecional
In this work we will present a study of the magnetic properties of three systems: manganites, amorphous ribbons and bilayers with exchange bias. Whole the magnetization measurements were made in a SQUID magnetometer developed during the period of this thesis. We studied several films and buck manganitas samples. All samples present the effect of the colossal
Publicado em: 2002