Magnetization performance of hard/soft Nd_9.6Fe_80.3Zr_3.7B_6.4/α-Fe magnetic nanocomposites produced by surfactant-assisted high-energy ball milling

Abstract

Neodymium iron boron (NdFeB) magnets are sintered anisotropic materials. They were commercially introduced in the early 1980s, and since have been used in different applications owing to their superior properties. Herein, we investigated the influence of 0.5 to 8 h of milling time on the morphological, structural, and magnetic performance of Nd9.6Fe80.3Zr3.7B6.4 powders produced using surfactant-assisted high-energy ball milling (SA-HEBM). The results revealed that the relationship between coercivity (H ci ) and milling time had a non-monotonous character reaching a maximum value of H ci = 8.92 kOe after 1 h of milling. The effect of the volume ratio of various magnetic phases (Nd2Fe14B and α-Fe) on microstructure and magnetic properties was also reported. The highest specific saturation magnetization (σ s = 120 emu g−1) was attained after 8 h of milling for powders with volume fraction: Nd2Fe14B–81 ± 2% and α-Fe–12 ± 2%. The expected value of Nd2Fe14B specific saturation magnetization was estimated (σ N = 108 ± 2.5 emu g−1) using the experimental value of σ s and magnetic phase volume fractions. The ratio of remanence to saturation magnetization of the Nd2Fe14B with milling time was also determined and analyzed.

Structural, Microstructural and Magnetic Properties of SmCo5/20wt%Fe Magnetic Nanocomposites Produced by Mechanical Milling in the Presence of CaO

“…Although the use of surfactants can produce oxidation [24], various oxides (iron oxide or samarium oxide) are absent due to the addition of CaO. This behavior can be explained by the very strong bonding between Ca and O.…”

Correlation between Composition and Magnetic Properties of SrFe₁₂O₁₉/Co Nanocomposite Synthesized by the High Energy Ball-Milling Process

“…So far, many methods have been used to synthesize exchange-spring NCs materials, such as the co-precipitation method [6], high energy ball milling (HEBM) process [4,9], sol-gel method [8]. The HEBM process is used to manufacture NCs ferrites because it has many advantages, such as high uniform mixing, simplicity, and high yield of hard and soft ferrite phases compared to other methods.…”