MULTILEVEL AND THREEDIMENSIONAL NANOMAGNETIC RECORDING - Bio-Inspired and Nanoscale Integrated Computing - page 187

Real head

Recording layer

S real
δ

Central plane of the
recording layer

S image

'Image' head

SUL

Note: Spacing loss due to the SUL is
S image −

S real = .

δ

(a)

Real head

SUL boundary

Recording
layer

H

H >

Image head

SUL

SUL

(b)

Disk substrate

Pattern

Rotation
direction

(c)

Figure 6.8. (a) A diagram of an image model to illustrate the spacing loss due to
the offset in the separation between the real and image heads with respect to
the central plane of the recording layer. (b) A schematic illustrating the ''move''
of the image closer to the recording layer if a convex SUL boundary is used.
(c) Patterned SUL with rectangular islands.