Bulk SmCo3 nanocrystalline magnets with magnetic anisotropy

Bulk SmCo3 nanocrystalline magnets with magnetic anisotropy
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具有磁各向异性的块状 SmCo3 纳米晶磁体

DOI:
10.1016/j.jmmm.2020.166552
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发表时间:
2020-05
影响因子:
2.7
通讯作者:
Xiaohong Li
Xiaohong Li
中科院分区:
材料科学3区
文献类型:
--
作者:
Tiancong Li;Bo Jiang;Li Lou;Yingxin Hua;Jieqiong Gao;Jinyi Wang;Xiaohong Li

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在具有10-20 nm小晶粒尺寸的块状SmCo 3纳米晶材料中,实现强晶体织构是一个挑战,这对于它们作为高性能永磁体至关重要。在这里,我们制造了一个各向异性的块体SmCo 3纳米晶磁体与强(00 l)织构结合的小晶粒尺寸为10-20 nm的使用高压热压(HPTC)的方法从非晶前驱体。该磁体具有明显的磁各向异性,其Mr/Mr_0 = 1.53,最大磁能积为4.2MGOe(33.8kJ/m3),明显高于相同前驱体制备的各向同性磁体的Mr/Mr_0 = 1.01和1.9MGOe(15.1kJ/m3)。这些各向异性磁体显示出β=-0.31%/°C的矫顽力温度系数和α=-0.14%/°C的剩磁温度系数。变形温度和退火温度对各向异性SmCo 3纳米晶磁体的微观结构和磁性能有重要影响。这些研究结果使定向大块SmCo 3磁体的实际应用的制造迈出了重要的一步。
In bulk SmCo3nanocrystalline materials with small grain sizes of 10–20 nm, it is a challenge to realize a strong crystal texture that is crucial for them as high-performance permanent magnets. Here we fabricated an anisotropic bulk SmCo3nanocrystalline magnet with a strong (00l) texture combined with a small grain size of 10–20 nm using a high-pressure thermal compression (HPTC) approach from amorphous precursors. This magnet had an obvious magnetic anisotropy withMr///Mr⊥= 1.53 and a maximum energy product of 4.2 MGOe (33.8 kJ/m3) which were obviously higher than thoseMr///Mr⊥= 1.01 and 1.9 MGOe (15.1 kJ/m3) of the isotropic magnets prepared using the same precursors. These anisotropic magnets showed a coercivity temperature coefficient ofβ= –0.31 %/°C and a remanence temperature coefficient ofα= –0.14 %/°C. The deformation and annealing temperatures played important roles on the microstructures and magnetic properties of these anisotropic SmCo3nanocrystalline magnets. These findings make an important step toward the fabrication of oriented bulk SmCo3magnets for practical applications.
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