Study of the role of Ti doping on magnetic properties of some nanocomposite alloys of α-Fe/Nd2Fe14B type

Magnetic Properties of SmCo5 + 10 wt% Fe Exchange-Coupled Nanocomposites Produced from Recycled SmCo5

“…In this work, we explore the possibility of improving on the sustainability aspect by creating exchange-coupled nanocomposites from recycled SmCo 5 magnets [ 21 , 22 , 23 ] (90 wt%) and a cheap and available 3d metal (Fe, 10 wt%). While most of the recent work in this area is on Nd 2 Fe 14 B+Fe nanocomposites [ 24 , 25 , 26 , 27 , 28 ], the choice of recycled SmCo 5 was made due to the relative purity of these industrial magnets compared with other compositions [ 2 , 3 ]. These types of materials could minimize purchase and environmental costs due to critical elements, adding to the savings accrued by enhanced magnetic properties.…”

First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase

“…Besides, the magnetic field for the positive peak was close to their coercivity, which confirmed the homogeneous demagnetization behavior. 21 It should be noted that the magnitude of the positive δM peak of Nd 15 Fe 77 B 8 was larger than that of Nd 14.2 Fe 78.6 B 7.2 . The larger magnitude of the positive δM peak meant a stronger exchange-coupling interaction.…”

“…The magnetic states of the PSD were sensitive to grain size and the number of possible magnetic states grew rapidly with increasing grain size, which resulted in a large number of peaks merging into a multimodal ridge. 21 According to the H c of the peak center, the ridges of the two samples could be divided into three zones. The peak of Nd 15 Fe 77 B 8 in zone 1 corresponded to the MD with the peak center located at 2 kOe.…”

“…[18][19][20] Fortunately, a new and emerging method, the first-order-reversal-curve (FORC) diagram, can be applied to study the demagnetization process of hysteresis materials, which could provide full mapping of magnetic switching, magnetic interactions, and the magnetic domain nature in the magnetic system. [20][21][22][23][24] The precursors with precise composition were critical to the preparation of Nd 2 Fe 14 B-based nanostructures of the desired compositions. Besides, the scanning electron microscope (SEM) images (Fig.…”

Crystallization kinetics of Ti-doped Nd₂Fe₁₄B/α-Fe nanocomposite permanent magnets

“…这也是 实验结果与理论值相差甚远的原因之一. 为此人们 已经开展了多种尝试来优化Nd 2 Fe 14 B/a-Fe纳米 复合磁体的微观结构 [16−18] , 特别是通过在NdFeB 三元合金中添加合金元素来减小a-Fe晶粒的尺寸 [19,20] . 研究发现, 一些合金元素, 如Ti, Co, Zr, Pr 和 Sm 等, 可以减小 Nd 2 Fe 14 B/a-Fe磁体的晶粒尺寸, 优 化微结构 [21−24] .…”