Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: FV Internal Symposium in honour of Nobelprice 2007 to Peter Grünberg and Albert Fert

MA 24.4: Hauptvortrag

Donnerstag, 28. Februar 2008, 11:00–11:30, EB 301

Status and Future of Magnetic Recording — •Dieter Weller — Seagate Technology, 47010 Kato Rd, Fremont, CA 94538

The areal density in magnetic recording continues to grow at 40% per year. This growth is fueled by advancements in recording heads and media as well as improvements in the systems architecture and channels electronics. Perpendicular magnetic recording (PMR) was introduced in 2005 at 130 Gbit/in² and is now deployed across all product lines at densities up to 250 Gbit/in². Laboratory demos show that 520 Gbit/in² in PMR and 602 Gbit/in² in Discrete Track Recording (DTR) [Western Digital and TDK in October, 2007] are possible. Component technologies are tunneling magneto-resistance (TMR) heads and granular CoCrPt based perpendicular media with soft underlayers. Discrete tracks help to reduce the adjacent-track erasure effect and allow for higher track density. It is expected that a combination of PMR and DTR will enable Tbit/in² densities by 2010. At that point major changes in the heads and media are needed to support further extensions. The two vital options are (1) to scale the media to smaller grain size but use harder magnetic materials, which require write assist to allow recording in Heat Assisted Magnetic Recording (HAMR) and (2) to lithographically make thermally stable islands and record one bit on each one of them in Bit Patterned Media (BPM).