Magnetic domain structure in nanocrystalline Ni-Zn-Co spinel ferrite thin films using off-axis electron holography

Abstract

Spin-sprayed Ni-Zn-Co ferrite films with high μ r ″ >100 in extremely wide frequency range 100 MHz-1 GHz J. Appl. Phys. 93, 7133 (2003) We report a study of the magnetic domain structure of nanocrystalline thin films of nickel-zinc ferrite. The ferrite films were synthesized using aqueous spin-spray coating at low temperature ($90 C) and showed high complex permeability in the GHz range. Electron microscopy and microanalysis revealed that the films consisted of columnar grains with uniform chemical composition. Off-axis electron holography combined with magnetic force microscopy indicated a multigrain domain structure with in-plane magnetization. The correlation between the magnetic domain morphology and crystal structure is briefly discussed. V C 2014 AIP Publishing LLC.