Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 04, 2024 - March 05, 2024
In recent years, hard disk drives (HDDs) have been mainly used in cloud data centers. As the annual amount of data generated has increased significantly, it has become essential to increase the capacity of HDDs constantly. Therefore, heat-assisted magnetic recording (HAMR) is expected to be a next-generation recording method. Currently, FePt media is used for HAMR, and there are two concerns. One is that the FePt media makes it difficult to achieve high BPI because it is difficult to achieve both the small grain and the high degree of order. The second is reliability problems because the FePt media has a high curie temperature of approximately 400°C. Specifically, there have been reports of a deterioration in the shape of the near field transducer (NFT), an occurrence of head contamination, and a deterioration of the head DLC (diamond-like carbon). On the other hand, analytical studies have shown that the NFT temperature during writing is below 300°C, so the mechanism of the above phenomenon is not clear. In this paper, to elucidate the heat transfer mechanism between the head and the media, we compared the thermal analysis results of the head-media model using the heat transfer coefficients from published papers with the data from published papers. As a result, it was concluded that the heat mainly transferred from the head to the media and that the head temperature was higher than the media temperature.
