报告题目：Recent Advancement and Future Trend of Magnetic Recording Systems
报 告 人：Dr Suguo HUO
报告时间：2016年12月12日上午9:30 – 11:30
报告地址：武汉光电国家实验室A202
邀 请 人：谢长生 教授

报告内容：
Magnetic storage is by far the most important member of the storage hierarchy in modern electronic devices. It has been studied and improved since 1890s and its wide application has dramatically changed human life.
The reader and writer elements of today’s perpendicular magnetic recording (PMR) HDDs have reached a physical limitation. Without future recording technologies, they cannot become smaller, nor can the tracks they read and write. Shingled write magnetic recording (SMR) is a new technology for improving recording density which differs from traditional approaches. It rearranges the way data is stored on a disk by overlapping tracks - similar to shingles on a roof - thereby increasing track density and improving recording density. Seagate is first to introduce this cutting edge technology - the world’s first SMR hard drive - in 2014, which improves areal densities by 25%, making SMR the most cost-effective technology existing today.
To further improve recording density in future, heat-assisted magnetic recording (HAMR) has been under development over the past few years. HAMR is reported to have the potential to push the so called super-paramagnetic limit back further, allow writing on a much smaller scale than before, thus increase areal densities by two orders of magnitude. The principle of the HAMR technique is to heat the recording medium temporarily during the writing process, resulting in a reduction of the anisotropy and consequently the coercivity. As a result, information can be inscribed in the medium at the elevated temperature. The heated region is cooled down rapidly afterwards and the coercivity will soon increase again, thus information recorded during the HAMR process remains thermally stable.
This talk will present the innovation behind SMR and the latest development of HAMR. Both of these two technologies will help to break barriers to new areal densities and be applied in future magnetic recording systems.

Dr Suguo HUO简介：
Dr Suguo HUO is a LCN (UCL&IC) Senior E/Ion Beam Manager (2009 -) in Seagate and a Visiting Professor in Hebei Normal University (2015 -). He has obtained his PhD degree from Sheffield Centre for Advanced Magnetic Materials and Devices, Department of Engineering Materials, University of Sheffield. He has worked as a Post-doctoral R.A in CRIST, Dept of SECEE, Plymouth University and a Post-doctoral Fellow in Micro & Nanostructural materials group, H.H.Wills Physics Laboratory, University of Bristol. He is also a recipient of Brounton Medal, “2000 suguo Huo”, from Sheffield University in millennium year and Seagate Key Employee (2003, 2005, 2006 & 2008 – only three times from 2000 – 2009 in Seagate). His research is magnetic materials for next generation magnetic recording.