Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

TL;DR

This study synthesizes nanosized barium hexaferrite particles via microemulsion, analyzing their microstructure and magnetic properties, revealing mono-domain particles with significant magnetic characteristics at room temperature.

Contribution

It introduces a microemulsion method for producing nanosized barium hexaferrite with detailed magnetic and structural property analysis.

Findings

Particles are mono-domain with 280 nm size

Saturation magnetization of 48.86 emu/g at room temperature

Coercivity of 2.4 x 10^5 A/m at room temperature

Abstract

Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 105 A/m at room temperature. The anisotropy field Ha and magneto-crystalline anisotropy K1 were 1.4 x 106 A/m and 2.37 x 105 J/m3, respectively.