Synthesis of magnetically exchange coupled SrFe12O19/FeCo core/shell particles through microwave-polyol process

• Core/shell SrFe12O19/FeCo particles are synthesized with microwave-polyol process.
• The exchange coupling is confirmed by magnetic hysteresis loop and Henkel plot.
• Microwave heating leads to less SrFe12O19 loss than electric plate heating.
• Microwave-polyol synthesis process can better tailor particle magnetic properties.

Core/shell structured SrFe12O19/FeCo particles were synthesized through a microwave-polyol process. The magnetic exchange coupling between SrFe12O19 and FeCo was investigated by magnetic hysteresis loop and Henkel plot. Compared with electric plate heating, which is reported to result in SrFe12O19 loss during the reaction, microwave heating requires shorter reaction time and leads to less SrFe12O19 loss. The mass loss of SrFe12O19 during the FeCo coating process was investigated by washing as-synthesized SrFe12O19/FeCo particles with diluted acid. The results show that there is a negligible loss of SrFe12O19 during the FeCo coating process. This paper provides an easy way to precisely tailor the magnetic properties of magnetically exchange coupled SrFe12O19/FeCo core/shell particles.