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.
