Tunable asymmetric magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films

We investigate the magnetization dynamics through the magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films. We observe that the magnetoimpedance response is dependent on the thickness of the non-magnetic Cu spacer material, a fact associated to the kind of the magnetic interaction between the ferromagnetic layers. Thus, we present an experimental study on asymmetric magnetoimpedance in ferromagnetic films with biphase magnetic behavior and explore the possibility of tuning the linear region of the magnetoimpedance curves around zero magnetic field by varying the thickness of the non-magnetic spacer material, and probe current frequency. We discuss the experimental magnetoimpedance results in terms of the different mechanisms governing the magnetization dynamics at distinct frequency ranges, quasi-static magnetic properties, thickness of the non-magnetic spacer material, and the kind of the magnetic interaction between the ferromagnetic layers. The results place ferromagnetic films with biphase magnetic behavior exhibiting asymmetric magnetoimpedance effect as a very attractive candidate for application as probe element in the development of auto-biased linear magnetic field sensors.Comment: 5 figure

Soil attributes and biomass yield from Pinus caribaea var. hondurensis.

Biomass yield from Pinus caribaea var. hondurensis is conditional on soil attributes. With the silvicultural practice currently being used in Brazil, Pinus stands might produce lower yields due to nutrient shift from harvest and due to changes in the edaphic environment from mechanization. Therefore, this study aims to evaluate chemical and physical soil attributes and determine which are correlated with higher biomass yields. Four commercial stands were selected, with differing growth patterns, each having four trees selected from the dominant layer, in addition to soil samples for chemical and physical analyses. Soil attributes and biomass yield data were submitted to analysis of variance (ANOVA), means were compared by the Tukey test, and the Pearson correlation coeffi cient was determined. Chemical attributes directly or indirectly associated with the sum of bases and physical attributes associated with water availability were found to be related to biomass yield

Produção de propágulos da goiabeira em jardins clonais irrigados e adensados.

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Pisces, Gymnotiformes, Hypopomidae, <i>Brachyhypopomus draco</i> (Giora, Malabarba and Crampton, 2008): New species record at Lagoa doPeixe National Park, state of Rio Grande do Sul, Brazil

The present paper describes a new occurrence of the species Brachyhypopomus draco in a wetland area of theLagoa do Peixe National Park, state of Rio Grande do Sul, Brazil

Impactos socioeconômicos de cultivares de feijão caupi na Região Meio-Norte do Brasil.

Caracterizacão das cultivares geradas; BR 17-Gurgueia; BR 14-Mulato; Cultivar Monteiro; Impactos socioeconômicos; Desafios.bitstream/item/36496/1/Doc52.pd

Recomendação de genótipos de feijão para o município de Alenquer, Pará.

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Avaliação de linhagens de feijão (Phaseolus vulgaris L.) do grupo roxo/rosinha no Município de Alenquer, Pará.

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