High (BH)max (Nd,Dy)-(Fe,Co)-B Hard Magnetic Powders Synthesized by Microwave Processing

Nd
₁₄
Dy
₁
Fe
₆₇
Co
₁₀
B
₈
magnetic nanoparticles were synthesized by microwave combustion followed by reduction diffusion (RD). Our nanoparticles exhibit coercivity of 9.2 kOe with good maximum energy product ((BH)
_max
) of up to 13 MGOe at room temperature. The temperature coefficients of remanence (α) and coercivity (β) of the particles were found to be -0.82% and -0.21% in the temperature range of 300 K to 400 K. Dy was found to be uniformly distributed in the nanoparticles.