Search Results - "de Aguiar, F.M"

Photo-induced polymerization of polyaniline by de Barros, R.A., de Azevedo, W.M., de Aguiar, F.M.

“…A straightforward route to prepare polyaniline is presented in which photons and metallic ions replace conventional oxidants to promote polymerization of…”
Get full text

Spin-wave instabilities, auto-oscillations, and chaos in yttrium-iron-garnet by Rezende, S.M., de Aguiar, F.M.

“…A review is presented of recent experimental results in yttrium-iron-garnet subject to three different spin-wave pumping mechanisms: parallel pumping,…”
Get full text

Resonant freak microwaves by de Aguiar, F.M.

“…The Helmholtz equation describing transverse magnetic modes in a closed flat microwave resonator with 60 randomly distributed discs is numerically solved. At…”
Get full text

Intersections of energy surfaces in quantized Sinai billiards by de Aguiar, F.M.

“…Degeneracies in the spectra of quantized Sinai billiards are numerically investigated. Two effects recently predicted are observed, namely, (i) a geometric…”
Get full text

Spin-wave excitation by direct current in obliquely magnetized nanostructures by Rodríguez-Suárez, R.L., Azevedo, A., de Aguiar, F.M., Rezende, S.M.

“…The magnetization dynamics of magnetic nanostructures magnetized at an arbitrary out-of-plane angle is investigated with the spin-wave formalism. The magnetic…”
Get full text

GMI measurements in ribbons of Co 70.4Fe 4.6Si 15B 10 in a wide range of frequencies by de Araújo, A.E.P, Machado, F.L.A, de Aguiar, F.M, Rezende, S.M

“…This paper reports room-temperature giant magnetoimpedance (GMI) data, measured in samples made of pieces of ribbons of amorphous Co 70.4Fe 4.6Si 15B 10 in the…”
Get full text

Spin wave instability in simultaneous orthogonal and parallel pumping by Araújo, W., de Aguiar, F.M., Azevedo, A., Rezende, S.M.

“…The theory of parallel-pumping spin wave instability in ferrimagnetic insulators in the presence of a low-power perpendicular RF magnetic field at half the…”
Get full text

GMI measurements in ribbons of Co70.4Fe4.6Si15B10 in a wide range of frequencies by de Araújo, A.E.P, Machado, F.L.A, de Aguiar, F.M, Rezende, S.M

Get full text

Experimental test of macroscopic models for exchange anisotropy in FM/AF bilayers by Rezende, S.M, Azevedo, A, de Aguiar, F.M, Lucena, M.A, Fermin, J.R, Parkin, S.S.P

“…Ferromagnetic resonance measurements in two series of ferromagnetic (FM)/antiferromagnetic (AF) bilayer samples of NiFe( t)/NiO and CoFe( t)/IrMn have been…”
Get full text

Exchange anisotropy in NiFe films on (1 0 0) NiO single-crystal substrate by Rezende, S.M, Lucena, M.A, Azevedo, A, Oliveira, A.B, de Aguiar, F.M, Egelhoff, W.F

“…The exchange anisotropy in a Ni 81Fe 19 film sputtered on a (1 0 0) NiO single-crystal substrate is investigated with MOKE magnetometry, ferromagnetic…”
Get full text

Spin-wave alternating periodic–chaotic dynamics by de Aguiar, F.M, Rosenblatt, S, Rezende, S.M, Azevedo, A

“…A description is given of pulsed ferromagnetic subsidiary resonance experiments in a YIG sphere at room temperature. Beyond the Suhl instability threshold,…”
Get full text

Temperature dependence of the interfilm magnetic interaction in Fe/Cr/Fe trilayers by Chesman, C, Almeida, N.S, Azevedo, A, de Aguiar, F.M, Rezende, S.M

“…The behavior of the interfilm magnetic interaction in Fe(40 Å)/Cr( t Cr)/Fe(40 Å) trilayers ( t Cr=11, 13 and 15 Å), grown on MgO(1 0 0), is investigated…”
Get full text

Effect of Al overlayers on the magnetic properties of Fe thin films by Fermin, J.R., Azevedo, A., de Aguiar, F.M., Machado, F.L.A., Rezende, S.M.

“…In this work, we report on the effect of Al overlayers on the magnetic properties of Fe thin films. In-plane ferromagnetic resonance has been used to measure…”
Get full text

Test of the domain wall model on ferromagnetic resonance in NiFe/NiO exchange biased films by Lucena, M.A, Azevedo, A, Oliveira, A.B, de Aguiar, F.M, Rezende, S.M

“…Ferromagnetic resonance (FMR) is used to investigate NiFe/NiO samples exhibiting the exchange anisotropy effect characteristic of (FM)/(AF) bilayers. The data…”
Get full text

Brillouin light scattering by current driven magnons in Fe/Cr/Fe by Rezende, S.M, de Aguiar, F.M, Lucena, M.A, Azevedo, A

“…The technique of Brillouin light scattering has been used to observe the excitation of spin waves by a microwave current injected through point contacts in…”
Get full text

Biquadratic coupling dependence on spacer layer thickness for Fe/Cr/Fe by Azevedo, A., Chesman, C., Lucena, M., de Aguiar, F.M., Rezende, S.M., Parkin, S.S.P.

“…We report on exchange coupling properties in sputtered Fe(40 Å)/Cr( t)/Fe(40 Å) trilayers. By fitting Brillouin light scattering, ferromagnetic resonance and…”
Get full text

Spin-wave experiments: Simultaneous pumping revisited by de Aguiar, F.M., Rezende, S.M., Azevedo, A.

“…Confirming theoretical predictions more than 30 years old, we show that the parametric instability threshold of microwave parallel-pumped spin waves in YIG…”
Get full text

Chaotic dynamics of two coupled classical spins by Rezende, S.M., de Aguiar, F.M.

“…We show that a very simple system consisting of two interacting classical spins driven by a microwave field displays a very rich nonlinear dynamics similar to…”
Get full text

Detailed investigation of the GMI in a commercial soft-ferromagnetic amorphous alloy by Neto, João Cozac, Machado, F.L.A, de Biasi, R.S, de Araujo, A.E.P, de Aguiar, F.M

“…An investigation of the giant magnetoimpedance effect (GMI) in pieces of a commercial alloy METGLAS 2705 M is presented. The GMI measurements were carried out…”
Get full text

Brillouin light scattering in CMR manganite films by Machado, F.L.A, Lucena, M.A, de Araújo, A.E.P, Azevedo, A, de Aguiar, F.M, Rezende, S.M, Nigam, A.K

“…Thin films of La 0.7A 0.3MnO 3 (A=Ce, Ca, and Sr) and La 0.55Ho 0.15Sr 0.3MnO 3 manganites have been investigated by Brillouin light scattering at room…”
Get full text