Recording disk with antiferromagnetically coupled multilayer...

Details Recording disk with antiferromagnetically coupled multilayer... Recording disk with antiferromagnetically coupled multilayer...

2011-01-25

2011-01-25

Renner, Craig A. (Department: 2627)

Dynamic magnetic information storage or retrieval

Record medium

Disk

Reexamination Certificate

active

07876529

ABSTRACT:
An apparatus having a write head for writing data on to a recording medium comprises a recording disk medium and one or more ferromagnetic islands. The recording disk medium has a data layer in discrete tracks with trenches between the discrete tracks, and a soft underlayer beneath the data layer and the trenches. The one or more ferromagnetic islands are disposed in the trenches between the discrete tracks in the recording disk medium and over the soft underlayer. The one or more ferromagnetic islands comprise a first layer having a first magnetization direction and a second layer having a second magnetization direction that is different than the first magnetization direction.

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