Effect of Cu Substitution on the Magnetic Properties of SmCo5 Film with Perpendicular Magnetic Anisotropy
Effect of Cu Substitution on the Magnetic Properties of SmCo5 Film with Perpendicular Magnetic Anisotropy
复制标题
Cu取代对垂直磁各向异性SmCo5薄膜磁性能的影响
DOI：
10.1007/s11664-012-2119-1
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发表时间：
2012-08-01
影响因子：
2.1
通讯作者：
Miao, Xiangshui
中科院分区：
文献类型：
--
作者：
Cheng, Weiming;Dai, Yifan;Miao, Xiangshui
具有垂直磁各向异性的SmCo5薄膜由于其巨大的磁晶各向异性而成为一种很有前景的超高密度磁记录介质。本文通过模拟和实验研究了Cu替代Co对SmCo5薄膜磁性能和微观结构的影响。基于第一性原理理论的模拟结果表明，Cu替代SmCo5中的Co可以降低总交换相关常数，提高SmCo5薄膜的矫顽力。采用射频磁控溅射技术在石英玻璃基板上制备了不同Cu掺杂的Sm(Co,Cu)5/Cu/TiW薄膜样品，研究了Sm(Co,Cu)5薄膜矫顽力对Cu掺杂和退火条件的依赖性。实验结果表明，Cu掺杂可以减小SmCo5薄膜的晶粒尺寸，提高其矫顽力。通过优化溅射和退火条件，Sm(Co0.72Cu0.28)5 薄膜获得了 3796 Oe 的垂直矫顽力。
SmCo5 film with perpendicular magnetic anisotropy is a promising candidate ultrahigh-density magnetic recording medium due to its huge magnetocrystalline anisotropy. This paper investigates the effect of Cu substitution for Co on the magnetic properties and microstructure of SmCo5 film by simulations and experiments. The simulation results based on first-principles theory show that Cu substitution for Co in SmCo5 can reduce the total exchange- correlation constant and increase the coercivity of SmCo5 film. Sm(Co,Cu)5/Cu/TiW film samples with different Cu doping were fabricated on quartz glass substrates by radiofrequency (RF) magnetron sputtering, and the dependence of the coercivity of the Sm(Co,Cu)5 film on the Cu doping and annealing conditions was studied. The experimental results demonstrate that Cu doping can decrease the grain size and increase the coercivity of SmCo5 film. By optimizing the sputtering and annealing conditions, perpendicular coercivity of 3796 Oe was obtained in Sm(Co0.72Cu0.28)5 film.