BEGIN:VCALENDAR VERSION:2.0 PRODID:-//DTU.dk//NONSGML DTU.dk//EN CALSCALE:GREGORIAN BEGIN:VEVENT DTSTART:20251021T123000Z DTEND:20251021T131500Z SUMMARY:Modern Hard Disk Drives: Applied Science in a Box DESCRIPTION:

A DCAMM seminar will be presented by

\n

\n

\n

Dr. Julius HohlFeld
\nSenior Research Scientist at the Institute Jean Lamour,
\nUniversity of Lorraine
\nNancy, France 
\n

\n 

\n

\n

\nAbstract: 
\n
\nIn the first part of my talk, I will introduce some of the diverse challenges that need to be solved in order to make hard disk drives work. In contrast to common believe, most of these challenges are not about magnetics, but cover a wide range of topics such as aerodynamics, thermodynamics, chemistry/molecular dynamics, tribology, high-speed electronics, pattern recognition, thin film processing and material science. At the end of this first part, I will introduce the so-called trilemma that results from the need to satisfy conflicting requirements for the lifetime, the signal to noise ratio, and the write-ability of information simultaneously. This trilemma limits the ultimate storage density of perpendicular magnetic recording to about 1 Tbit/inch2.
\n
\nIn the second part, I will show that Heat Assisted Magnetic Recording solves the trilemma by removing the write-ability limitation. Then I will present the major HAMR specific challenges for the write heads and recording media and mention the general strategies that we used at Seagate to solve them. The talk ends with a movie of a working HAMR drive - declared a viable product in 2018 and available to the general public since July 2025.
\n
\nDanish pastry, coffee and tea will be served 15 minutes before the seminar starts.
\n
\nAll interested persons are invited

X-ALT-DESC;FMTTYPE=text/html:

A DCAMM seminar will be presented by

\n

\n

\n

Dr. Julius HohlFeld
\nSenior Research Scientist at the Institute Jean Lamour,
\nUniversity of Lorraine
\nNancy, France 
\n

\n 

\n

\n

\nAbstract: 
\n
\nIn the first part of my talk, I will introduce some of the diverse challenges that need to be solved in order to make hard disk drives work. In contrast to common believe, most of these challenges are not about magnetics, but cover a wide range of topics such as aerodynamics, thermodynamics, chemistry/molecular dynamics, tribology, high-speed electronics, pattern recognition, thin film processing and material science. At the end of this first part, I will introduce the so-called trilemma that results from the need to satisfy conflicting requirements for the lifetime, the signal to noise ratio, and the write-ability of information simultaneously. This trilemma limits the ultimate storage density of perpendicular magnetic recording to about 1 Tbit/inch2.
\n
\nIn the second part, I will show that Heat Assisted Magnetic Recording solves the trilemma by removing the write-ability limitation. Then I will present the major HAMR specific challenges for the write heads and recording media and mention the general strategies that we used at Seagate to solve them. The talk ends with a movie of a working HAMR drive - declared a viable product in 2018 and available to the general public since July 2025.
\n
\nDanish pastry, coffee and tea will be served 15 minutes before the seminar starts.
\n
\nAll interested persons are invited

URL:http://www.dcamm.dk/da/Kalender/2025/10/Seminar_No_792 DTSTAMP:20260921T174500Z UID:{70DB697D-1F51-4E8E-9226-B4ECAED87AA1}-20251021T123000Z-20251021T123000Z LOCATION: Building 5124, room 038, Aarhus University, Finlandsgade 20, 8200  Aarhus N, END:VEVENT END:VCALENDAR