Magnetization reversal and nanostructure refinement in magnetically annealed Nd2Fe14B∕α-Fe-type nanocomposites
Magnetization reversal and nanostructure refinement in magnetically annealed Nd2Fe14B∕α-Fe-type nanocomposites
复制标题
DOI：
10.1063/1.1853693
复制
发表时间：
2005-05
影响因子：
3.2
通讯作者：
B. Cui;Chengtao Yu;Ke Han;J. Liu;H. Garmestani;M. Pechan;H. Schneider-Muntau
中科院分区：
文献类型：
--
作者：
B. Cui;Chengtao Yu;Ke Han;J. Liu;H. Garmestani;M. Pechan;H. Schneider-Muntau
在1.2T的面内或面外电场中退火后，Nd2.4Pr5.6Dy1Fe84Mo1B6纳米复合材料的纳米结构细化、磁性各向异性和硬磁性能增强。磁退火增强了α-Fe的面外（110）晶粒织构和面内2:14:1的单轴磁各向异性。磁性退火还可以引入更精细、角度更小、分布更均匀的软硬纳米颗粒。磁场相关转矩测量表明，这些纳米复合材料具有复杂的磁化反转机制。与未经磁场退火的样品相比，经磁场退火的样品的硬磁性能有明显改善。特别是能积（BH）max提高了26.6%（从94 kj / m3提高到119kj / m3）。磁性能的提高是晶体织构增强、纳米结构细化和面内单轴磁各向异性增强的结果。
Nanostructure refinement, magnetic anisotropy and hard magnetic property enhancement have been observed in melt-spun Nd2.4Pr5.6Dy1Fe84Mo1B6 nanocomposites annealed in an in-plane or out-of-plane field of 1.2T. The magnetic annealing results in an enhancement of an out-of-plane (110) crystal texture of α-Fe and an in-plane uniaxial magnetic anisotropy of the 2:14:1 phase. Magnetic annealing also introduces finer, less angular and more homogeneously distributed soft and hard nanograins. Field dependent torque measurement indicates a complex magnetization reversal mechanism in these nanocomposites. Compared with the sample annealed without a field, there is a noticeable improvement in the hard magnetic properties for the magnetically annealed samples. Especially, the energy product (BH)max was enhanced by 26.6% (from 94to119kJ∕m3). The improvement in the magnetic properties is a result of the enhanced crystallographic texture, nanostructure refinement, and in-plane uniaxial magnetic anisotropy enhancement.