Coercivity Mechanism of (Nd(0.8)Ce(0.2))(2.4)Fe(12)Co₂B Ribbons with Ferromagnetic Grain Boundary Phase.
Coercivity Mechanism of (Nd(0.8)Ce(0.2))(2.4)Fe(12)Co₂B Ribbons with Ferromagnetic Grain Boundary Phase.
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铁磁晶界相(Nd0.8Ce0.2)2.4Fe12Co2B带材的矫顽力机理
DOI：
10.3390/ma10091062
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发表时间：
2017-09-11
期刊：
影响因子：
--
通讯作者：
Ren K
中科院分区：
文献类型：
--
作者：
Li H;Liang Y;Tan X;Xu H;Hu P;Ren K
由于关键稀土金属的价格波动（即，Nd和Dy）。在这项工作中，我们研究了快淬（Nd 0. 8 Ce 0. 2）2. 4Fe 12 Co2 B薄带和退火样品在773 K下15 min，1特斯拉（T）磁场的微观结构和磁性能，以更好地理解的矫顽力机制。我们发现硬磁晶粒周围的薄而连续的层沿着晶界（GB）与高浓度的铁磁元素（Fe + Co >74原子%）。δM图中明显的正峰和Lorentz磁显微镜观察到的相互作用畴结构表明，硬磁晶粒之间通过铁磁GB相存在较强的交换耦合作用。在1 T的外加磁场中的退火通过增强交换耦合相互作用来增加剩磁，导致最大产物能量（（BH）max）比熔纺薄带高16%。在300-500 K温度范围内，研究了矫顽力随温度的变化关系，提出了室温下快淬（Nd_（0.8）Ce_（0.2））_（2.4）Fe_（12）Co_（2B）铁磁GB相薄带的矫顽力是强畴壁钉扎和形核共同作用的结果。同样的机制在退火的带中起作用。
Understanding the coercivity mechanism has had a substantial impact on developing economically more attractive RE-based (RE = rare earth) permanent materials because of price volatility of key RE metals (i.e., Nd and Dy) in recent years. In this work, we investigated the microstructure and magnetic properties of melt-spun (Nd0.8Ce0.2)2.4Fe12Co2B ribbons and annealed samples at 773 K for 15 min with 1 Tesla (T) magnetic field to better understand the coercivity mechanism. We found hard magnetic grains were surrounded by thin and continuous layers along the grain boundaries (GBs) with a high concentration of ferromagnetic elements (Fe + Co >74 at%). The obvious positive peak in the δM plot and the interaction domain structure observed by Lorentz magnetic microscopy indicate that there is strong exchange coupling interaction through the ferromagnetic GB phase between hard magnetic grains. The annealing in an applied magnetic field of 1 T increases the remanence by enhancing the exchange coupling interaction, leading to a maximum product energy ((BH)max) which is 16% higher than that of melt-spun ribbons. We also studied the temperature dependence of the coercivity in a temperature range of 300–500 K, and proposed that the coercivity of melt-spun (Nd0.8Ce0.2)2.4Fe12Co2B ribbons with ferromagnetic GB phase at room temperature was from the combination of strong domain-wall pinning and nucleation. The same mechanism works in the annealed ribbons.
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影响因子：
2.7
作者：
Li, Zhi;Liu, Weiqiang;Huang, Xiulian
通讯作者：
Huang, Xiulian
影响因子：
9.4
作者：
Cui, BZ;Han, K;Liu, JP
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Liu, JP
影响因子：
3.2
作者：
LIVINGSTON, JD
通讯作者：
LIVINGSTON, JD
影响因子：
3.2
作者：
CROAT, JJ;HERBST, JF;PINKERTON, FE
通讯作者：
PINKERTON, FE
影响因子：
29.4
作者：
Pathak, Arjun K.;Khan, Mahmud;Pecharsky, Vitalij K.
通讯作者：
Pecharsky, Vitalij K.