ラマン分光分析を用いた磁気ヘッドスメアの環境ガス要因の分析

抄録

In recent years, the demand for hard disk drives (HDDs) has been growing in the midst of a huge amount of information handled with the development of AI and deep-learning. In particular, a demand for HDD for data centers is growing, and capacity of HDDs is required. Currently, the phenomenon of head smear is concerned for the heat assisted magnetic recording (HAMR), which is the proposed recording method. This problem is caused by the lubricant and diamond-like carbon (DLC) overcoat being heated to a high temperature, which reduces the reliability of the hard drive. In this study, we analyzed the materials of head smear in He or air environment using Raman spectroscopy and estimated the mechanism of the head smear generation from its spectra. As a result, it was found that the head smear was caused by not only with lubricants but also in DLC. It was found that head smear has hydrocarbon and lubricant structures. These are often in the air environment, the decomposition of DLC and lubricant is promoted by the influence of oxygen, it is expected to be those generated.