High-frequency transport properties of spin-spray plated Ni–Zn ferrite thin films

Abstract

The frequency and temperature variation of magnetoimpedance in Ni–Zn ferrite thin films fabricated by spray plating method were studied. It is observed that the frequency induces a metal–insulator crossover behavior in impedance spectra. The frequency behavior of the electrical properties of the film can be modeled by an equivalent circuit composed of resistance and capacitance. The relaxation time and activation energy of the conductivity were calculated. The result suggests that the high-frequency conductivity of the spin-spray plating of a Ni–Zn ferrite film is predominantly associated with the dielectric, rather than by magnetization, dynamics. Mechanisms underlying high-frequency transport are discussed.

Growth behavior and RF/microwave properties of low temperature spin-sprayed NiZn ferrite

“…1 L oxidation solution containing 2 mM NaNO 2 and 17.5 mM CH 3 COONa varying pH value from 8 to 12 and 1 L precursor solution mixed of NiCl 2 , ZnCl 2 , FeCl 2 by varying pH value of 2-5 were sprayed at 90°C temperature spinning heated plate simultaneously [1][2][3] The growth rate was approximately 40 nm/min, see detailed description of the spin spray deposition process [3,6]. Microstructure and composition characterization of the NiZn ferrite films were studied by x-ray diffraction (XRD) with a Cu K a source (k = 1.541 Å ), scanning electron microscope (SEM) and atomic force microscope (AFM).…”

“…Soft magnetic material operated at high frequency range have attracted much attention in RF/microwave and telecommunication industries [1,2]. Ferrite materials with high permeability and high resistivity at high frequency are one of most widely used material in RF/microwave applications.…”

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

“…The single semicircle observed in the Nyquist plots suggests that complex impedance is caused by a single relaxation process associated with the intrinsic property of the grains in the material. 36,39 For ideal non-Debye-type relaxation, the peaks of both Z¢¢ and M¢¢ should occur at the same frequency for a particular temperature. 40 However, in the studied materials, Z¢¢ and M¢¢ show their peak value at different frequencies as shown in Fig.…”

Synthesis of nanocrystalline nickel–zinc ferrite (Ni0.8Zn0.2Fe2O4) thin films by chemical bath deposition method

“…The successful growth of magnetic Ni-Zn ferrite films is an important step towards their future incorporation as inductors and transformers into integrated circuits operating at high frequency. Several attempts have been made by researchers to deposit Ni-Zn ferrite films by a variety of techniques including alternative sputtering technology [15], spin-spray plating [16], sol-gel method [17,18], pulsed laser deposition [19][20][21], spray and spin deposition techniques [22][23][24][25]. However, most of them cannot be economically applied on a large scale because they require high vacuum system, complicated experimental steps, and high reaction temperatures.…”