Ferromagnetic resonance study of diluted Fe nanogranular films

Abstract

Ferromagnetic resonance ͑FMR͒ in diluted Fe nanogranular films with low volume fractions of Fe (v) has been studied. Films prepared by a co-sputtering technique are composed of amorphous Fe nanoparticles embedded in SiO 2 glass matrices. The resonance of the FMR uniform mode is found to be strongly affected by the v, the temperature, and the angle between the film plane and the applied magnetic field. The present study suggests that the values of these parameters should be carefully selected in order to realize left-handed materials using diluted ferromagnetic-metal nanogranular films.

Broadband Ferromagnetic Resonance Measurements in Ni/ZnO and Niγ-Fe2O3Nanocomposites

“…Second, a weakly resolved line is clearly visible on the low field side at a nominal frequency of 10 GHz. The origin of the weak signal has yet to be elucidated, but it should be remarked that a similar weak signal (at about 500 Oe) was observed in nanogranular films composed of ferromagnetic amorphous Fe nanoparticles embedded in SiO 2 glass matrices [36].…”

“…In Figure 4, we see with increasing frequency the shift of the uniform mode to a higher field. The uniform mode frequency [34][35][36][37][38] may be obtained in the form ω res = γ(H res + H int ), where γ is the effective gyromagnetic ratio, and H res and H int denote the resonance field at frequency, ω res /2π, and the internal field, respectively. The data in Figure 5 show how the resonance frequency evolves with H res .…”

Magneto-Optical Kerr Effects of Yttrium-Iron Garnet Thin Films Incorporating Gold Nanoparticles

“…Thin films consisting of metallic Au nanoparticles embedded in crystalline YIG matrices were prepared through the cosputtering method together with thermal annealing [15]. Au and YIG targets were simultaneously sputtered in an Ar gas atmosphere (20 m Torr) using an rf-sputtering apparatus; the mixture of Au and YIG was deposited onto quartz substrates.…”

Magnonics: Selective heat production in nanocomposites with different magnetic nanoparticles

“…22,23 Absorption of the microwave irradiation by ferromagnetic nanoparticles is therefore attractive due to the broad potential applications in different technologies. 3,15,16,18,[24][25][26][27][28][29][30][31][32][33][34][35][36][37] Some polymer films or nonpolar solutions are poor microwave absorbers; therefore, embedding ferromagnetic nanoparticles into the matrix appears attractive. 38 At FMR, the embedded fillers can produce heat while the matrix can be transparent within a particular FMR band.…”