6 documents found, page 1 of 1
High frequency dielectric characterization of graphene doped flexible ceramics ...
França Junior, S. A. N.; Souza, A. L. R.; Cruz, L. B.; Vaz, F.; Ferreira, Armando José Barros; Bohn, F.; Acchar, W.; Correa, M. A.This paper explores the tape casting technique to produce flexible heterostructured multilayers composed of graphene nanoplatelets doped Alumina and Ceria doped Nickel Oxide-Gadolinium. Given the excellent mechanical and electrical properties of graphene, multilayers were structured to explore the dielectric properties at a high-frequency regime. The stability of the suspensions, measured by rheological charact...
Assessing the relaxation mechanisms contributions on magnetoimpedance effect in...
Santos, J. G. S.; Silva, E. F.; Gamino, M.; Ferreira, Armando José Barros; Vaz, F.; Bohn, F.; Correa, M. A.Damping parameter plays a key role in the magnetization dynamics of ferri/ferromagnetic materials with potential technological applications. Experimentally the damping parameter can be estimated from the linewidth of the ferromagnetic resonance experiment, which is altered by distinct mechanisms associated with extrinsic contributions, such as spin pumping and two-magnon scattering mechanisms. Here we perform a...
Unraveling the role of magnetic anisotropy on the thermoelectric response: A th...
Correa, M. A.; Gamino, M.; De Melo, A. S.; Lopes, M. V. P.; Santos, J. G. S.; Souza, A. L. R.; França Junior, S. A. N.; Ferreira, A.Magnetic anisotropies have a key role in tailoring magnetic behavior in ferromagnetic (FM) systems for specific sensor applications. Furthermore, they are also essential elements for manipulating the thermoelectric response in anomalous Nernst effect (ANE) and longitudinal spin Seebeck effect (LSSE) systems at unsaturated field regimes. Here, we propose a theoretical approach and explore the role of magnetic an...
Co2FeAl Heusler alloy onto amorphous TiO2 layer: exploring the quasi-static and...
Correa, M. A.; Ferreira, Armando José Barros; Souza, A. L. R.; Andrade Neto, N. F.; Motta, F. V.; Bomio, M. R. D.; Bohn, F.; Vaz, F.We investigate an heterostructure consisting of Co2FeAl/TiO2 deposited onto Si(100) substrate by Magnetron Sputtering. Specifically, we explore the influence of the thickness of the amorphous TiO2 layer on the quasi-static and dynamic magnetic properties of the Co2FeAl layer. The structural properties of the heterostructure are studied through X-ray diffraction and UV-Vis spectroscopy. The magnetic behavior is ...
Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by th...
Ferreira, A.; Vaz, F.; Correa, M. A.; Bohn, F.; Lanceros-Méndez, S.The magnetization dynamics in ZnO:Ag/NiFe heterostructures has been investigated through magnetoimpedance measurements. By annealing the ZnO:Ag layer during the production process of the samples, structural and magnetic features of the whole heterostructure are modified, showing that the dynamical magnetic response of the heterostructure is strongly dependent on the annealing temperature. The magnetoimpedance r...
High-frequency magnetoimpedance effect in meander-line trilayered films
Melo, A. S. de; Bohn, F.; Ferreira, Armando José Barros; Vaz, F.; Correa, M. A.We report a systematic study of structural properties and quasi-static and dynamical magnetization behavior of trilayered systems produced in the meander-line geometry. Our samples consist of NiFe/Cr/NiFe layers produced by the magnetron sputtering technique. Here we grow samples with NiFe and Cr layers in a wide thickness range, keeping constant the total thickness of the trilayer. The structural properties an...