Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe₁₂‐Based Permanent Magnets

Abstract

ThMn12‐type SmFe12‐based permanent magnets have exhibited great potential in advanced magnet motors because of their high temperature stability of magnetic properties. However, the applications could be seriously limited due to the trade‐off between phase stability and intrinsic magnetic properties. In this work, an effective solution is demonstrated by constructing the core–shell structure (Sm‐rich shell and Y‐rich core) via a spontaneous spinodal decomposition process. The anisotropy field for the (Sm0.75Y0.25)(Fe0.8Co0.2)11.25Ti0.75 alloy is mostly optimized to be 9.24 T at room temperature. Such an enhancement is ascribed to the pinning process of domain walls by the magnetic‐hardening Sm‐rich shell, which is directly observed by in situ Lorentz transmission electron microscopy and reconstructed by micromagnetic simulation. Moreover, the phase stability and saturation magnetization are simultaneously increased, which is attributed to the synergistic effect of Y, Co, and Ti substitutions. More importantly, the high μ0Ms value of 1.52 T is comparable to the reported (Sm,Zr)Fe12‐based bulk alloys that contain a larger amount of soft α‐Fe phases, indicating that this strategy is more promising toward bulk magnets. The present study provides a significant concept for the development of advanced permanent magnets and also has implications for understanding the structural origin of intrinsic magnetic configurations.

Perspective and Prospects for Ordered Functional Materials

“…[16] The core-shell nanostructure is another example of nanoscale ordering to enhance the exchange coupling between magnetic functional components. [46,47] As shown in Figure 4d, a coreshell ordered nanostructure with Nd 2 Fe 14 B cores and a-Fe shells were fabricated by self-assembly in alloy melt. [47] In such ordered structure, sufficient exchange coupling between the hardmagnetic Nd 2 Fe 14 B phase and the soft-magnetic a-Fe phase enables a good combination of high remanent magnetization (B r ) and high H c , see Figure 4d.…”

Constructing Superhydrophobicity by Self‐Assembly of SiO2@Polydopamine Core‐Shell Nanospheres with Robust Oil‐Water Separation Efficiency and Anti‐Corrosion Performance

“…To demonstrate the versatility and the rapid assembly process, Nd-Fe-B permanent magnets were chosen due to their susceptibility of harsh conditions and poor corrosion resistance. [53][54][55] After immersion, the Nd-Fe-B surface exhibited hierarchical scale roughness (Figure 5a) and the surface was rendered superhydrophobic with water contact angle of 169.5°, compared with 86.7° on bare Nd-Fe-B surface (Figure 5d). EDS mapping in Figure S14 (Supporting Information) presents that Nd-Fe-B surface was fully covered with FAS-SiO 2 @PDA coatings and a minor amount of Fe was detected from the underlying Nd-Fe-B.…”

18‐3: Research on Improving the Back Impact resistance of Flexible OLED Modules

“…Addressing these challenges requires a multidisciplinary approach, integrating insights from materials science, mechanical engineering, and device physics to develop robust solutions that can withstand the rigors of daily use without compromising the inherent benefits of OLED technology [11,12] . By optimizing material properties and device architectures, researchers aim to significantly improve the durability of flexible OLED displays, ensuring they meet the evolving demands of consumers and the electronics market [13,14] .…”