Lecture of IEEE-DL✣✣–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––✣✣
Date ＆ Time: Wed 13 December 2023, 13:00-14:00
Venue: Kyushu University（https://www.kyushu-u.ac.jp/ja/campus/ito/）
Building West 2, 3F, Room 325-236✣✣–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––✣✣

Magnetic data storage technology; from the invention of perpendicularmagnetic recording (PMR) to the social integration
Yoichiro Tanaka
Tohoku University, JapanThe digital world is producing nearly a hundred Zetta bytes of data per year and creating values for the quality ofsociety. A huge amount of data is being stored, processed, transmitted, and then shared via large scale networked
datacenters which consist of millions of data storage systems filled with perpendicular magnetic recording (PMR) harddisk drives. The PMR technology was invented by Shunichi Iwasaki in 1975 and the first commercial product waslaunched in 2005. Since then, the data storage has become the ever-growing foundation of the digital world and led
the data-driven innovations such as bigdata AI analytics, internet of things, medical science, and even a blackhole
visualization in astronomy.
This lecture will provide the essential magnetics to create innovative data storage technology of PMR and the originof the high-density recording performance which has led current recording density growth. The storage performancestands on the stacked system foundation and the building blocks are, from the base, physics of magnetics, 3D material
controls of sub-nanometer in size, magnetic and electronic device design, storage device integration, and storage
system architectures together with non-volatile memories to unleash the intrinsic performance. The development of
new storage devices and the system requires a multi-scale approach and a right guiding principle to establish expectedfunctions. As an extension of PMR research, the lecture will also show the prospect of future storage technology andthe system architecture from the multi-scale view of the storage system development. A new computational storage
system aiming at unifying computation power on data store and brain-inspired system considerations as well as theacademism-industry relations to realize those systems will also be introduced.

BioYoichiro Tanaka is a professor in Research Institute of Electrical Communication (RIEC)
at Tohoku University. He received the Bachelor, the Master degrees in Communications
Engineering and the Ph.D degree in Electronic Engineering from Tohoku University, where
he did his thesis research on perpendicular megnetic recording physics and the storage
system integrations. He had worked in Toshiba’s storage device business and in academia
over 30 years. He devoted to the proof and development of PMR and achieved therealization of the world’s first PMR HDD in 2005. His carrier includes the development ofa giant magnetoresistive head, the perpendicular glanular thin film media, and recently a
new computational storage systems with integrated bigdata analytics capability. He won theNikkei BP Technology Awards (1997, 2006), the Japan Magnetic Society Achievement
Award (2006) and Okochi Memorial Prize (2007). He is a senior member of IEEE and a member of Magnetic Society
Administrative Committee for a three-year term 2022-2044. He is also a fellow of the Magnetic Society of Japan(MSJ). He is currently serving as the Secretary General for Intermatinal Magnetics Conference (INTERMAG 2023
Sendai).
Contact: Yoichiro Tanaka, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira,Aoba-ku, Sendai, Japan 980-8577; e-mail: yoichiro.tanaka.e1@tohoku.ac.jp