Magnetic Domain Structures and Magnetic Properties of Lightly Nd-Doped Sm?Co Magnets With High Squareness and High Heat Resistance
Magnetic Domain Structures and Magnetic Properties of Lightly Nd-Doped Sm?Co Magnets With High Squareness and High Heat Resistance
复制标题
高方形高耐热轻掺Nd Sm?Co磁体的磁畴结构与磁性能
DOI：
10.1109/tmag.2018.2868969
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发表时间：
2019
影响因子：
2.1
通讯作者：
Takezawa Masaaki
中科院分区：
文献类型：
--
作者：
Machida Hiroaki;Fujiwara Teruhiko;Fujimoto Chieko;Kanamori Yu;Tanaka Jun;Takezawa Masaaki
研究了Nd掺杂Sm（Fe，Cu，Zr，Co）7.5合金的磁畴结构与磁性能的关系。在制备过程中，采用了烧结和固溶处理之间的缓冷工艺，以促进显微组织的均匀化。所开发的磁体在25 °C下分别实现了33.8 MGOe的最大能量积[BH]m和11.2 kOe的矫顽力Hcb。此外，在150 °C下的B-H线是线性的，这意味着即使在150 °C下也不会发生不可逆退磁。与常规Sm-Co磁体一样，反磁化磁通密度的温度系数Br和内禀磁化率的温度系数Hcj分别为0.035%/K和0.24%/K。用克尔效应显微镜观察磁畴结构，施加0至-20 kOe的磁场，然后从晶界均匀地产生反向磁畴。用扫描透射电子显微镜观察被称为“细胞结构”的显微结构。Fe和Cu分别分离为2-17相和1-5相。此外，在没有产生杂质相的情况下，Nd在晶胞结构中表现出与Sm相同的成分行为。
The relationship between magnetic domain structures and magnetic properties of Nd-doped Sm(Fe, Cu, Zr, Co)7.5 was investigated. In the preparation process, slow cooling between sintering and solution treatment was employed to promote homogenization of microstructures. The developed magnet achieved a maximum energy product, [BH]m, of 33.8 MGOe and coercivity, Hcb, of 11.2 kOe at 25 °C, respectively. Moreover, B-H line at 150 °C was linear, which means that irreversible demagnetization does not occur even at 150 °C. Temperature coefficients of remanent magnetic flux density, Br, and intrinsic coercivity, Hcj, were 0.035%/K and 0.24%/K, respectively, as usual the conventional Sm-Co magnet. Magnetic domain structures were observed with a Kerr effect microscope with a magnetic field applied from 0 to -20 kOe, and then reverse magnetic domains were generated evenly from grain boundaries. Microstructures referred to as “cell structures” were observed with a scanning transmission electron microscope. Fe and Cu were separated to 2-17 and 1-5 phases, respectively. Moreover, without producing impurity phases, Nd showed the same composition behavior with Sm in a cell structure.