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为了改善记录介质的磁性能,研究了溅射Cr和CrTi底层对Co68Cr17Pt15性能的影响。发现在玻璃盘基和CoCrPt磁性层之间引入100nm厚的Cr底层,可使介质矫顽力从56kA·m-1增加到127kA·m-1,同时剩磁比和矫顽力矩形比分别增加66%和74%。同时还发现Cr底层厚度对介质磁性能有较大影响。考虑到减小Cr底层和磁性层的晶格匹配,在Cr底层里添加Ti元素,当Ti原子分数达到1.5%时,即使在室温下溅射,薄膜也有好的面内磁滞回线,此时矫顽力可达到160kA·m-1。X射线衍射表明在介质中引入Cr和CrTi底层,由于薄膜能更好的沿着垂直于易磁化轴方向生长而使介质性能提高。
In order to improve the magnetic properties of the recording medium, the effects of sputtered Cr and CrTi undercoats on the performance of Co68Cr17Pt15 were investigated. It is found that the introduction of a 100 nm thick Cr underlayer between the glass disk substrate and the CoCrPt magnetic layer can increase the coercive force of the medium from 56 kA · m-1 to 127 kA · m-1, and increase the remanence ratio and the square coercivity respectively 66% and 74%. At the same time, it is also found that the thickness of the Cr underlayer has a great influence on the magnetic properties of the medium. In view of reducing the lattice matching between the Cr bottom layer and the magnetic layer, Ti element is added to the Cr bottom layer. When the Ti atomic fraction reaches 1.5%, the film has good in-plane hysteresis loop even at room temperature, When the coercive force can reach 160kA · m-1. X-ray diffraction shows the introduction of Cr and CrTi underlayers in the medium, which improves the properties of the medium due to better growth of the film along a direction perpendicular to the axis of easy magnetization.