Effect of rare earth content on microstructure and magnetic properties of SmCo and NdFeB thin films
Effect of rare earth content on microstructure and magnetic properties of SmCo and NdFeB thin films
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稀土含量对SmCo和NdFeB薄膜微观结构和磁性能的影响
DOI：
10.1063/1.1453940
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
L. Schultz
中科院分区：
文献类型：
--
作者：
V. Neu;U. Hannemann;S. Fähler;B. Holzapfel;L. Schultz
高各向异性稀土金属间化合物薄膜在磁性微型器件中的应用日益成为人们关注的焦点。我们通过脉冲激光沉积制备了硬磁SmCo和NdFeB薄膜，并研究了稀土含量对相形成、微观结构和磁性能的影响。通过 X 射线衍射观察到，稀土含量的相演化显示出两个体系的明显差异。对于 SmCo，在低 Sm 含量时发现无序 SmCo7 结构，并且在富含 Sm 的样品中观察到晶格常数的变化。同时，矫顽场得到改善，而贫 Sm 薄膜中的磁性面内织构则因 Sm 含量较高而消失。对于 NdFeB，由于均匀性范围较小，Nd 含量的增加会导致额外的 Nd 相。与体积相反，矫顽力降低，这可归因于晶粒尺寸和粗糙度的显着增加。
Thin films of highly anisotropic rare earth intermetallic compounds increasingly come into the focus of interest for application in magnetic miniature devices. We prepared hard magnetic SmCo and NdFeB films by pulsed laser deposition and investigated the influence of rare-earth content on phase formation, microstructure, and magnetic properties. The phase evolution with rare earth content, as observed by x-ray diffraction, shows a distinct difference for the two systems. For SmCo a disordered SmCo7 structure is found at low Sm content and a change in the lattice constants is observed for a Sm-rich sample. Simultaneously, the coercive field improves whereas the magnetic in-plane texture found for Sm-poor films vanishes for higher Sm content. For NdFeB the increase in Nd content leads to an additional Nd phase because of the small homogeneity range. Contrary to the bulk, coercivity is reduced, which can be attributed to a significant increase of grain size and roughness.