Study of CoFe₂O₄/NiFe₂O₄ nanocomposite ferrite film

Abstract

Electroless nanostructured films of hard ferrite (CoFe 2 O 4 ), soft ferrite (NiFe 2 O 4 ) and composite ferrite CoFe 2 O 4 /NiFe 2 O 4 (hard/soft ferrite) were deposited on soda lime glass. The structures and magnetic properties of samples were characterised by X-ray powder diffraction, field emission scanning electron microscopy and superconducting quantum interference device (SQUID, MPMSXL). The results of magnetic properties revealed that the saturation magnetisation (M s ), remanent magnetisation (M r ), coercivity (H c ) and M r /M s ratio of composite ferrite film (CoFe 2 O 4 /NiFe 2 O 4 ) were higher than those of a single hard ferrite film (CoFe 2 O 4 ) and soft ferrite film (NiFe 2 O 4 ). The enhancement in magnetic properties of composite ferrite film (CoFe 2 O 4 /NiFe 2 O 4 ) may be attributed to the exchange coupling interaction between hard magnetic and soft magnetic materials. The mean crystallite size of soft ferrite (NiFe 2 O 4 ), hard ferrite (CoFe 2 O 4 ) and composite ferrite films (CoFe 2 O 4 /NiFe 2 O 4 ) was found to be in the range of 20-40 nm. The exchange-spring interaction mechanism was discussed.

Microstructure and high frequency electromagnetic parameters of the soft/soft (CoFe2O4)x : (Ni0.4Cu0.2Zn0.4Fe2O4)y nanocomposites

“…So an exchange-coupled magnet nanocomposite (NC) is the combination of high saturation magnetization of the so with high coercivity of the hard phase. 32 The exchange-coupling interaction between the hard and so magnetic phases will bring about additional exibility and an opportunity to tailor the overall properties of the materials 33 and give rise to unique physical characteristics as well as superior properties, making these NCs exceptional compared to their individual component counterparts for biomedicine, spintronics, optoelectronics, and nanoelectronics applications. 34 The BH max , which is associated with remnant magnetization, M s , and H c of the material, shows the energy density storage capacity of magnetic material.…”