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首页> 外文期刊>Nanotechnology >The microstructure, high performance magnetic hardness and magnetic after-effect of an α -FeCo/Pr_2Fe_(14)B nanocomposite magnet with low Pr concentration
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The microstructure, high performance magnetic hardness and magnetic after-effect of an α -FeCo/Pr_2Fe_(14)B nanocomposite magnet with low Pr concentration

机译：低Pr浓度的α-FeCo / Pr_2Fe_（14）B纳米复合磁体的微观结构，高性能磁硬度和磁后效应

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摘要

In this paper, a systematic investigation of the microstructure, high performance magnetic hardness as well as novel magnetic memory effect of the Pr_4Fe_(76)Co_(10)B_6Nb_3Cu_1 nanocomposite magnet fabricated by conventional melt-spinning followed by annealing at temperatures ranging from 600 to 700 ℃ in Ar gas for nanocrystallization are presented and discussed. Transmission electron microscopy (TEM) observation confirms an ultrafine structure of bcc-Fe(Co) as a magnetically soft phase and Pr_2Fe_(14)B as a hard magnetic phase with a spring-exchange coupling in order to form the nanocomposite state. Electron diffraction analysis also indicates that the Co atoms together with Fe atoms form the Fe_(70)Co_(30) phase with a very high magnetic moment (2.5 μB), leading to a high saturation magnetization of the system. High magnetic hardness is obtained in the optimally heat-treated specimen with coercivity H_c = 3.8 kOe, remanence B_r = 12.0 kG, M_r/M_s = 0.81 and maximum energy product (B H)_(max) = 17.8 MG Oe, which is about a 25% improvement in comparison with recent results for similar compositions. High remanence and reduced remanence are the key factors in obtaining the high performance with low rare-earth concentration (only 4 at.%). High-resolution TEM analysis shows that there is a small amount of residual amorphous phase in the grain boundary, which plays a role of interphase to improve the exchange coupling. Otherwise, in terms of magnetic after-effect measurement, a magnetic memory effect was observed for the first time in an exchange-coupled hard magnet.
机译：本文对常规熔体纺丝并在600至200°C的温度范围内退火制备的Pr_4Fe_（76）Co_（10）B_6Nb_3Cu_1纳米复合磁体的微观结构，高性能磁硬度以及新的磁记忆效应进行了系统研究。介绍并讨论了在氩气中700℃进行纳米晶化的过程。透射电子显微镜（TEM）观察证实，通过形成弹簧复合物，bcc-Fe（Co）的超细结构为软磁性相，Pr_2Fe_（14）B为硬磁性相，具有弹簧交换耦合，从而形成了纳米复合态。电子衍射分析还表明，Co原子与Fe原子一起以极高的磁矩（2.5μB）形成Fe_（70）Co_（30）相，从而导致系统的高饱和磁化强度。在经过最佳热处理的样品中，矫顽力H_c = 3.8 kOe，剩磁B_r = 12.0 kG，M_r / M_s = 0.81，最大能量乘积（BH）_（max）= 17.8 MG Oe，具有较高的磁硬度。与类似组合物的最新结果相比，提高了25％。高剩磁和降低的剩磁是在低稀土浓度（仅4 at。％）下获得高性能的关键因素。高分辨率TEM分析表明，在晶界中有少量残留的非晶相，其起相间作用以改善交换耦合。否则，就磁后效应测量而言，在交换耦合硬磁体中首次观察到磁记忆效应。

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