Written bits

Fig. 4. Written bits in the longitudinal recording mode (LMR). Shortest recorded wavelength is /2.

Figure 16.10 shows readout images of written bits in 26 consecutive layers. The bit and layer intervals were 2 fim and 5 /xm, respectively. The data were read out with a reflection confocal microscope (RCM). The details of the readout system are discussed in the Section 4. With the RCM, the written data are clearly read without crosstalk. 

Fig. 4.30. Magnetoresistive (MR) read-back signals from written bit transitions in a array of 4 nm diameter Fe4sPt52 nanocrystals. The line scans reveal magnetization reversal transitions at linear densities of (a) 500, (b) 1040, (c) 2140, and (d) 5000 flux changes mm. ...

Fig. 3.86). The beam, which is focused by an objective, generates a nonuniform charge distribution corresponding to an array pattern. After diffusion and recombination of the free charges, the position-dependent internal space-charge field results in a modulation of the refractive index [247]. The written bits are read by fluorescence. 

Figure 16.18 shows the spatial-frequency band of a written bit and the transfer-function band of the reading system. " This figure shows a vertical cut of the 3D band of the transfer function (ife-vector) space that includes the axial frequency (1/ ). 1/r is the transaxial spatial frequency of the polar coordinate r - + y where x and y are the two-dimensional coordinates of... 

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