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Polar Magneto-Optic Kerr Effect System - Polar Kerr

The Polar Magneto-Optic Kerr effect system characterizes the magnetic properties of the perpendicular magnetic recording (PMR) layer immediately after deposition, an important factor in the yield of disk drive media. The full disk, non-contact measurement technique and automated handling make the Polar Kerr system essential for production use and yield improvement. By quickly and accurately measuring the magnetic parameters crucial to PMR media production, the Polar Kerr system improves the ability to control the complex deposition process.


  • Polar Kerr effect-based non-destructive, non-contact measurement of the magnetic properties of PMR media
  • Rapid process feedback enhances control of the deposition process, measuring Hc, Hn, S, S* and other key magnetic properties of the recording layer
  • High-throughput production tool with automated cassette handling and simultaneous mapping of both sides of the PMR media
  • User-programmable applied field extrema and sweep rate for dynamic coercivity measurements

Gray-scale map of recording layer Hc

Production screen mapping results in graphical and tabular formats.

Recoil loop measurements and other complex measurements may be programmed using macro language.