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This work focuses on the structural and magnetic characterization of arrays of cobalt nanowires, with diameters in the range 100–400 nm and lengths of L⩽6 μm, produced by electrodeposition in polycarbonate membrane pores. Diffraction patterns of Co nanowires indicate that Co is stabilized in the hcp structure with a preferential (0001) texture oriented close to the perpendicular direction of the wires axes. Magnetic measurements at room temperature reveal that magnetization undergoes a change in the easy axis as the length of the wires increases. Clearly, the easy axis of the shortest wires is oriented along the axis of the wire. In the case of the longest wires, a crossover of the easy axis is observed, from the perpendicular to the parallel direction to the wire for the shortest. This magnetic behavior is explained through a simple magnetostatic model, which takes into account the dipolar interactions among wires, the demagnetizing field, and the magnetocrystalline anisotropy of Co.

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Abstract:The procedure used to obtain the expression of the dielectric tensor of cold plasma in a rotating electromagnetic field has been presented in our previous paper [1]. We used this procedure to derivate the dielectric tensor for hot plasma in a rotating electromagnetic field. By means of the expression of dielectric tensor which expresses the linear response of plasma, we derived, discussed and compared the dispersion relation for waves in hot plasma with the one obtained for cold plasma located in a rotating electromagnetic field. This dispersion relation, which is

In our paper, we derive the expression of the dielectric tensor for fully ionized hot plasma immersed in a rotating electromagnetic field. This tensor differs from the one obtained for a fully ionized cold plasma by the presence of a new factor due to the fact we took in a count of the thermal component.