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Small-angle polarized neutron studies of perpendicular magnetic recording media
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View: Figures


Image of FIG. 1.
FIG. 1.

The radial average of the isotropic nuclear-magnetic cross term for the sample in the remanent state following a saturation field of 3 T applied perpendicular to the film surface. The curves are based the scattering model described in the text and represented schematically in Fig. 2. The curves correspond to average magnetic diameters of 4.9 nm (red), 6.6 nm (black), and 8.2 nm (blue). is the ratio of the magnetic to nuclear diameter for each grain size. For all curves the average separation of the grains is 9.1 nm.

Image of FIG. 2.
FIG. 2.

A schematic of the analytic model used to fit the data, represented as a pair of grains of average separation and size. The fits produce a magnetic diameter which is 80% that of the corresponding grain size.

Image of FIG. 3.
FIG. 3.

The real space plots derived from TEM images that correspond to the scattering curves in Fig. 4 (see text). The extent of the magnetic region (red) can take different ratios to that of the grain (blue), but the ratio is assumed to be the same for grains of all sizes. The grain boundaries are shown in green.

Image of FIG. 4.
FIG. 4.

The same data as in Fig. 1, showing fits using the numerical model based on TEM measurements of the granular structure shown in Fig. 3. The curves correspond to different ratios of the magnetic to nuclear diameter for each grain.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Small-angle polarized neutron studies of perpendicular magnetic recording media