High-Temperature Magnetic Properties of Anisotropic SmCo 7 /Fe(Co) Bulk Nanocomposite Magnets

High-temperature magnetic properties of the anisotropic bulk SmCo 7 /Fe(Co) nanocomposite magnets prepared by multistep deformation have been investigated and compared with the corresponding isotropic nanocomposites. The anisotropic SmCo 7 /Fe(Co) nanocomposites with a Fe(Co) fraction of 28% exhibit much higher energy products than the corresponding isotropic nanocomposites at both room and high temperatures. These magnets show a small remanence ( $\alpha = -0.022$ %/K) and a coercivity ( $\beta = -0.25$ %/K) temperature coefficient which can be comparable to those of the conventional SmCo 5 and Sm 2 Co 17 high-temperature magnets. The magnetic properties of these nanocomposites at high temperatures are sensitive to the weight fractions of the Fe(Co) phase. This paper demonstrates that the anisotropic bulk SmCo 7 /Fe(Co) nanocomposites have better high-temperature magnetic properties than the corresponding isotropic ones.