Milestone-Proposal talk:Perpendicular Magnetic Recording

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Original Citation Title and Text -- Administrator4 (talk) 15:41, 29 July 2022 (UTC)

Perpendicular magnetic recording, 1977

In 1977, perpendicular magnetic recording was invented by Professor Shun-ichi Iwasaki of Tohoku University. The development of perpendicular recording media and the single-pole head made the most of magnetic physics to demonstrate the significant high-density recording performance. Since the first commercialization of perpendicular magnetic recording hard disk drives in 2005, the data storage technology utilizing perpendicular magnetic recording has established the foundation of “big data” information society.

Strongly support this proposal. -- Masahiro Yamaguchi (talk) 16:14, 20 June 2022 (UTC)

Magnetic recording has been a key technology to store digital data on individual computers and cloud data storage centers, leading the promotion of information-oriented society around the globe. This would not have happened without the proposed Perpendicular Magnetic Recording technology,

The original idea of perpendicular magnetic recording technology is to align magnetic moment ‘perpendicularly’ to a thin disk medium surface, while the moment traditionally aligned in the ‘longitudinal’ direction along the medium surface. This is an excellent idea of Professor Shun-ichi Iwasaki of Tohoku University. in 1977. The simultaneous invention of perpendicular recording media and single-pole heads led to the success of significant high-density recording performance, The dramatic transition from ‘longitudinal’ to ‘perpendicular’ recording" took place during 2005 and 2008, as described in Fig. 6 in the proposal document. This is clear evidence of the excellence of the original idea.

What I would like to emphasize further is a social impact of the proposed technology. It enabled massive ‘information’ storage, sharing ‘cultural properties’ online and more, rather than just recording many digital ‘bits.’ This is a distinctive advantage over the conventional ‘longitudinal’ recording technology.

A significant spillover effect of perpendicular magnetic recording technology is to have produced excellent global leaders and innovative knowledge. I am very happy that the IEEE International Magnetics Conference (Intermag), the flagship conference of the Magnetics Society has been a glorious stage on this topic during 1980s and 2000s.

Another spillover is to have stimulated a new research field called ‘spintronics,’ born from the research on the physics of high-density magnetic recording. Spintronics is currently leading to the creation of new value such as quantum computing.

For these reasons, I highly recommend Perpendicular Magnetic Recording as an IEEE Milistone.

Masahiro Yamaguchi President IEEE Magnetics Society

Strong support for this proposal -- Atsufumi (talk) 21:18, 20 June 2022 (UTC)

I have been known Prof. Shun-ichi Iwasaki's work on the perpendicular magnetic recording for over 20 years. As highlighted in this proposal, it is one of the major scientific and technological development in magnetism in the last decades, which has been implemented in all the hard disk drives commercially available nowadays. This unambiguously meets the criteria of the IEEE Milestones.

The perpendicular magnetic recording has been almost exclusively developed by Prof. Iwasaki as a collection of his broad research interests. It allows us to continue the monotonic increase in the areal recording density of hard disk drives, which stores over 90% of data human beings create. Hence it is the key technology for Big Data and cloud services we rely on.

Prof. Iwasaki has also been keen to foster younger researchers and disseminate his research. He supervised many students, including Profs. Muraoka and Takana, who succeeded his laboratory to continue to develop new technologies in magnetic recording. He has been very active in giving presentations at IEEE conferences and beyond.

Based on his achievements, the IEEE Magnetics Society selected Prof. Iwasaki as the very first interviewee of their oral history activities. His interview video has recently been posted on their Youtube page. His achievements were also recognised by a series of awards and prizes, including the IEEE Cledo Brunetti Award (1989), IEEE Magnetics Society Achievement Award (2002), Japan Prize (2010) and Benjamin Franklin Medal (2014).

Therefore I would very strongly support this proposal as the capacity of the President-Elect of the IEEE Magnetics Society.

Strong Support -- R.goldfarb (talk) 15:21, 18 October 2022 (UTC)

Magnetic recording in hard disk drives used to be longitudinal, with magnetization in the plane of the recording medium. Prof. Iwasaki’s insight was that higher recording densities could be obtained with magnetization perpendicular to the plane of the medium. His first paper on perpendicular magnetic recording was published in IEEE Transactions on Magnetics in 1977. Prof. Iwasaki developed the physics and engineering of the recording process, including a single-pole recording head, Co-Cr sputtered recording media with high coercivity and perpendicular magnetic anisotropy, and a magnetic underlayer for flux closure. Perpendicular recording was commercialized 2005 and, within a few years, replaced longitudinal recording.

Prof. Iwasaki’s seminal work was the most significant technological breakthrough in data storage in the 20th century, leading directly to the high storage densities that underpin our modern economy.

==Ron Goldfarb, Secretary-Treasurer, IEEE Magnetics Society; former editor-in-chief, IEEE Transactions on Magnetics; former chief editor, IEEE Magnetics Letters.

Strong support -- MURAOKA (talk) 03:16, 27 October 2022 (UTC)

Perpendicular magnetic recording, PMR, accomplished innovation to realize vast storage capacity for the “big-data” era. Thanks to PMR, whole magnetic storage devices, such as hard disk drives and tape storage devices, are able to largely increase its storage capacities. The contribution of PMR is applauded by the recent IEEE Oral Histories,, and many awards and honors.

PMR achieved the innovation of magnetic storage technologies by turning the recorded magnetization “perpendicular” to the recording medium surface. The essential breakthroughs consist of high-resolution media that have perpendicular magnetic anisotropy to stably maintain the recorded perpendicular magnetization, and the perpendicular recording heads that provide strong perpendicular magnetic field. The novel recording devices attained outstanding increase of recording density of PMR. They were both pioneering achievement.

Social impact of the innovation was significant for current and future Internet society. The Internet totally relies on data-driven technology, therefore, the large amount of information, or the “big data”, established with PMR data storage is indispensable. Magnetic data storage technology is capable to cope with the “data explosion” in the today’s Information Technology by PMR. The first paper on PMR was published in the IEEE Transactions on Magnetics in 1977, and the innovation was commercialized in 2005. It took somewhat long time 28 years after the first paper. It would be worthwhile to point out that our society needs PMR to meet the recent and future demand of the Internet society, which requires extremely large amount of information.

As described above, I am confident that PMR well deserves an IEEE Milestone.

Celia Shahnaz advocate approval -- Celia (talk) 14:08, 22 March 2023 (UTC)


Change in Citation by Proposer, Name Removed (by Proposer) -- Yoichiro Tanaka (talk) 17:11, 27 March 2023 (UTC)

The citation has been changed as follows. The name has been removed from the citation.

In 1977, Tohoku University team developed a magnetic recording system with a pole head writing on a Cobalt-alloy thin film perpendicular medium having a soft magnetic underlayer. This medium and configuration enabled data recording densities beyond those possible with longitudinal recording. With its first commercialization in hard disk drives in 2005, data storage technology utilizing perpendicular magnetic recording was an important enabler of the “big data” information revolution.

Re: Change in Citation by Proposer, Name Removed (by Proposer) -- Bberg (talk) 22:14, 29 March 2023 (UTC)

You should insert "a" before Tohoku, and make the date "1977-2005"

Change in citation wording and make the date "1977-2005" (by proposer) -- Yoichiro Tanaka (talk) 22:12, 4 April 2023 (UTC)

The citation includes "a" before Tohoku, and make the date "1977-2005"