Novel synthesizing method of BaFe12O19 micro rod and its superior coercivity with shape anisotropy

• BaFe12O19 micro rod shapes (BMRs) for high coercivity magnetic materials was successfully synthesized by self assembly method with sonication treatment.
• The optimized condition for the elaborate submicron rod BaFe12O19 structure with axial ratio of 5.1±1.3 was 1.7 MHz frequency with pH >12.2 DEA concentration.
• Magnetic measurements showed that the rod shape BaFe12O19 particles synthesized under optimal condition, exhibited a giant coercive field up to 7.5 kOe due to the larger axial ratio.

BaFe12O19 micro rod shapes (BMSs) for coercivity enhancement were synthesized by self-assembly method using diethyleneamine (DEA) with ultra-sonic treatment. The optimized condition for the elaborate submicron rod BaFe12O19 structure was 1.7 MHz frequency with pH >12.2 DEA concentration. The coercivity of BMSs with 150 nm width and 700 nm length showed 7.5 kOe (iHc). These results revealed that the high coercive BMSs were successfully synthesized to micro size by triggering shape anisotropy during sonication process.