有序异构功能材料

张海天, 张湘义

Heterostructured Functional Materials with Ordered Structures

ZHANG Hai-Tian, ZHANG Xiangyi

图4 纳米尺度晶粒尺寸序构导致的定向磁化反转及其对NdFeB/α-Fe纳米复合磁体磁性增强的影响[12]

Fig.4 Effect of nano-scale ordered structure with grain-size gradient on the magnetization reversal and enhanced properties of NdFeB/α-Fe nanocomposite magnets[12] (a) TEM images along the grain-size gradient from the free side (FS) to the cooling side (CS) of melt-spun ribbons (b) micromagnetic simulations of the directional magnetization reversal in the dual-gradients ordered structure (GHN-2) (H—applied reverse field) (c) a rare combination of high coercivity and large remanence resulted from the directional magnetization reversal in the ordered nanocomposite magnets (Inset shows the schematics of ordered gradient nanostructures. HS—homogeneous structure, MS—spin melting, ANN—thermal annealed, HPTD—high pressure thermal deformation, GHN-1—single-gradient structure)