Formation of Noncoil-Like Inductance in Nanocomposites (Fe_0.45Co_0.45Zr_0.10)_x(Al₂O₃)_1-xManufactured by Ion-Beam Sputtering of Complex Targets in Ar+O₂Atmosphere

Abstract

This paper investigates the inductive contribution to AC conductance in the granular nanocomposites (Fe0.45Co0.45Zr0.10)x(Al2O3)1−x. The initial nanocomposites studied were manufactured in Ar+O2 atmosphere by ion-beam sputtering of the target containing Fe0.45Co0.45Zr0.10 and alumina stripes and then subjected to the annealing procedure in air over the temperature range 373 K < Ta < 873 K. These samples, before and after annealing, were studied using the temperature 77 K < Tp < 300 K and frequency 50 Hz < f < 1 MHz dependences of a real part of the admittance σ(T, f ). Analysis of the observed σ(f, T p ) dependences for x < 0.5 demonstrated that in the studied samples the equivalent circuits with the capacitive and noncoil-like inductive contributions can be accomplished. Just in this case, the capacitive properties of RLC circuit with the phase angle −90• ≤ θ L < 0• are exhibited at low frequencies and the inductive properties with 0• become apparent at high frequencies. A value of the critical frequency f R , where θ H changes sign, depends on the metallic phase concentration x, measuring temperature T p , and annealing temperature T a .

Mechanisms of Carrier Transport in Cux(SiO2)1-xNanocomposites Manufactured by Ion-Beam Sputtering with Ar Ions

“…Such behavior is observed in many metalinsulator composites where metallic granules in the dielectric matrix are nanosized and show hopping mechanism of carrier transport due to jumps of electrons between the neighboring metallic nanoparticles (see [3,10,16,17]). …”

“…As it was shown earlier in our works [3,11] Therefore, the goal of this work was to elucidate the inuence of metal-to-dielectric component ration in the composite lms, consisting of Cu-based nanoparticles embedded into the dielectric (silica) matrix, on their structure and mechanisms of carrier transport based on the temperature/frequency dependences of impedance.…”

Tailored Magnetic and Electric States in 3d-Metal-Insulator Films: Characterization and Applications

“…Compara- The value of eective inductive contribution to the impedance estimated basing on the correspondent equivalent circuit was found to be as high as 20 µH/µm 3 at 1 MHz that is much higher than in the case of known diodes, pnp junctions, metal semiconductor interfaces (see references in [33]). …”

Measurement of Complex Permittivity of Oil-Based Ferrofluid in Magnetic Field

“…Since the ferrofluids belong to the complex systems, a continuous distribution of relaxation times can be expected. The analysis of low frequency relaxation process was done by fitting the complex permittivity data with the Cole-Cole model [2,7,8]. The parameters in Eq.…”