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IEEE Engineering Milestone For Perpendicular Magnetic Recording

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I am the President of Coughlin Associates and a storage analyst and consultant. I have over 40 years in the data storage industry with multiple engineering and management positions. I have many publications and six patents to my credit. I am also the author of Digital Storage in Consumer Electronics: The Essential Guide, the second edition was published by Springer. Coughlin Associates provides market and technology analysis (including reports on several digital storage technologies and applicat

On October 9, 2023 I attended the IEEE Engineering Milestone for Perpendicular Magnetic Recording in Sendai Japan as the President-Elect for the IEEE . Work on PMR began at Tohoku University in Professor Emeritus, Dr. Shunichi Iwasaki’s laboratory in 1977. Today all of the hard disk drives used to store most of the world’s data are using PMR.I met Dr. Iwasaki in 1978 at the University of Minnesota at Dr.

PMR as implemented in HDDs has a magnetic layer with the preferred magnetic recording orientation out of to the plane of the media. A special write structure is used to provide magnetic write fields perpendicular to the plane of the media and this perpendicular field is increased by a soft magnetic layer beneath the PMR recording layer, which enhances the perpendicular field from the write head.

By the late 1990’s and early 2000’s the areal density of HDDs was increasing over 100% each year using longitudinal recording. It was only in the early 2000’s that longitudinal magnetic recording areal density gains became difficult to achieve because of the thermal instability of very small magnetic recording regions using this technology. It was then that the 20+ years of research on PMR began to bear fruit.

Source: News Formal (newsformal.com)

 

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