Abstract
In bulk SmCo3 nanocrystalline materials with small grain sizes of 10–20 nm, it is a challenge to realize a strong crystal texture that is crucial for them as high-performance permanent magnets. Here we fabricated an anisotropic bulk SmCo3 nanocrystalline magnet with a strong (00l) texture combined with a small grain size of 10–20 nm using a high-pressure thermal compression (HPTC) approach from amorphous precursors. This magnet had an obvious magnetic anisotropy with Mr///Mr⊥ = 1.53 and a maximum energy product of 4.2 MGOe (33.8 kJ/m3) which were obviously higher than those Mr///Mr⊥ = 1.01 and 1.9 MGOe (15.1 kJ/m3) of the isotropic magnets prepared using the same precursors. These anisotropic magnets showed a coercivity temperature coefficient of β = –0.31 %/°C and a remanence temperature coefficient of α = –0.14 %/°C. The deformation and annealing temperatures played important roles on the microstructures and magnetic properties of these anisotropic SmCo3 nanocrystalline magnets. These findings make an important step toward the fabrication of oriented bulk SmCo3 magnets for practical applications.
Published Version
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