学术活动发布与订制系统

报告题目1：Recent Advances in Nanotribology of Head-Disk Interface in Hard Disk Drives

报告摘要：To achieve magnetic recording densities greater than 10 Tb/in², the HDI spacing must be less than 1–2 nm. Various technologies such as heat-assisted magnetic recording (HAMR) have been studied and developed to achieve such ultra-high magnetic recording densities. To ensure the practical applicability of HAMR, it is important to understand the reliability under laser heating conditions of perfluoropolyether (PFPE) boundary lubricant films and diamond-like carbon (DLC) thin films used on the head slider surface.

In this talk, the basic study related to PFPE boundary lubricant depletion characteristics due to rapid laser heating in HAMR is reviewed, based on our recent research. Furthermore, it is more important to understand the temperature dependence of the friction properties of PFPE boundary lubricant films on magnetic disks under laser heating conditions. We examine the temperature dependence of the friction characteristics of laser-heated magnetic disks coated with lubricant films by using a pin-on-disk tester. In addition, we investigate the effect of lubricant materials using four types of PFPE boundary lubricant materials as well as the effect of ultraviolet (UV) treatment on the friction coefficient characteristics of the lubricant films and discuss the fundamental characteristics for HAMR in hard disk drives,

报告人：Norio Tagawa

报告人简介：

Norio Tagawa received his BE and ME degrees in mechanical engineering from Tohoku University, Sendai, Japan. In 1986, he earned PhD degree in mechanical engineering from the University of Tokyo, Tokyo, Japan. From 1975 to 1997, he was with NEC Corporation. He joined the Department of Mechanical Engineering at Kansai University, Osaka, Japan, where he was a Trustee and Dean of the Faculty of Engineering Science of Kansai University and is currently a professor. He also has been a Vice President of the Japanese Society of Tribologists from May/2011 to May/2013. His current research includes nano-mechatronics and nano-tribology related to information storage devices as well as MEMS/NEMS.

报告题目2：Smear growth of hydrocarbon outgas at laser heating

报告摘要：Organic outgas is well known to cause smears on magnetic head sliders. For example, siloxane outgas is vaporized from certain components in hard disk drives (HDDs), that adsorbs on the magnetic disk surfaces, and SiO2 that is denatured from siloxane by flash temperature at a slider and disk contact gets accumulated on the slider surface. On the other hand, heat assisted magnetic recording (HAMR) is being developed to improve areal density. In HAMR, a laser light heats the magnetic disk surface to 400–500 K. Organic hydrocarbon adsorbed on a disk surface easily gets desorbed from the disk surface owing to thermal evaporation and dissociation by laser heating. In this study, we have studied smear growth from silane outgas on laser heating. We observe that the sailane adsorbed on the disk surface grew on the glass surface above the disk surface at the laser heating spot.

报告人：Hiroshi Tani

报告人简介：

1986: Master's degree in Physics Department of Science in Graduate school of Hiroshima University

1986: Hitachi Ltd. Co. Odawara works, design and development of magnetic disks

2003: Doctor’s degree in mechanical engineering in the University of Tokyo

2008: Move to the mechanical engineering dept. in Kansai University from HGST

2011: Professor in Kansai University

Research area: Molecularly lubrication of magnetic disk, Nanocarbon matetial (CNT, carbon nanofiber, graphene), Triboelectric generators, Tribochemistry