Study of CoFe2O4/CoFe2 nanostructured powder

TL;DR

This study investigates the magnetic properties of CoFe2O4/CoFe2 nanocomposites, revealing exchange coupling effects, phase behavior at different synthesis conditions, and significant enhancements in coercivity and energy product after milling.

Contribution

It introduces a method to synthesize and modify CoFe2O4/CoFe2 nanocomposites, demonstrating how processing conditions influence magnetic phase behavior and properties.

Findings

Nanocomposites show single magnetic behavior indicating exchange coupling.

Higher synthesis temperatures lead to two-phase magnetic behavior.

High energy milling significantly increases coercivity and energy product.

Abstract

We report an experimental study of the CoFe2O4/CoFe2 nanocomposite, a nanostructured material formed by hard (CoFe2O4) and soft (CoFe2) magnetic materials. The precursor material, cobalt ferrite (CoFe2O4), was prepared using the conventional stoichiometric gel-combustion method. The nanocomposite material was obtained by reducing partially the precursor material using activated charcoal as reducing agent in air and argon atmospheres, at 800 and 900 C respectively. The magnetic hysteresis loops demonstrate that, in general, prepared nanocomposite samples display single magnetic behavior, indicating exchange coupling between the soft and hard magnetic phases. However, for nanocomposite samples prepared at higher temperatures, the hysteresis measurements show steps typical of two-phase magnetic behavior, suggesting the existence of two non-coupled magnetic phases. The studied nanocomposites presented coercivity (HC) of about 0.7 kOe, which is considerably lower than the expected value for cobalt ferrite. A huge increase in HC (>440%) and maximum energy product (about 240%) was obtained for the nanocomposite after high energy milling processing.