Preparation and Characterization of Nd₂Fe₁₄B/α-Fe Nanocomposite Magnetic Material by Reduction Diffusion Process

Abstract

Thermal decomposition process was applied to synthesize Fe₃O₄ and Nd₂Fe₁₄B nanoparticles which were prepared by reduction diffusion process for preparing exchange-coupled nanoparticles. The magnetic Nd₂Fe₁₄B nanoparticles used in this study as the starting materials were synthesized via metal oleate complex method. Also mechanical ball mill technique was applied to the mixture of magnetic Nd₂Fe₁₄B and α-Fe nanoparticles to build an exchange-coupled nanoparticle. The mixture of Nd₂Fe₁₄B/α-Fe of nanoparticle was confirmed by transmission electron microscopy (TEM). The crystal structure of nanoparticle was characterized by X-ray diffraction pattern (XRD). The magnetic properties were characterized with saturation magnetization from hysteresis loop by vibrating sample magnetometer (VSM). Thermogravimetry using a microbalance with magnetic field gradient positioned below the sample was used for the measurement of a thermomagnetic analysis (TMA) curve showing the downward magnetic force versus temperature.

Keywords:

• exchange-coupled nanoparticles
• Metal-oleate complex
• Nd₂Fe₁₄B/ α-Fe nanocomposite

Acknowledgments

This work was supported by Korean National Research Laboratory Program. H. G. Cha would like to thank the financial support by Brain Korea 21.