Schematic of the cross-sectional sample structure (top), and top-view SEM images of the sample surfaces (bottom).
Field-dependent magnetization normalized by the saturation magnetization ( ) for the three samples as measured with VSM, with field applied perpendicular (dashed lines), and parallel (solid lines) to the sample surface. Solid symbols correspond to the integrated in-plane magnetization profiles as measured with PNR.
Measured PNR spectra (symbols) at 0.82 T for the A = 3.2 (top), A = 1.6 (middle), and A = 0.7 (bottom) samples. Solid and dashed lines are fits to the data. Note the different vertical scales for the three panels. Error bars correspond to , and are smaller than the point size for much of the data shown.
Nuclear (solid, left axis) and magnetic (dashed, right axis) depth profiles for the (a) A = 3.2, (b) A = 1.6, and (c) A = 0.7 samples.
Nuclear (solid, left axis) and magnetic (dashed, right axis) depth profiles, and corresponding cross-sectional TEM images for (a) A = 3.2, (b)A = 1.6, and (c) A = 0.7 samples. The scale of the TEM images matches that of the depth PNR profiles. For each sample, the surface Co/Pt multilayer is delineated by a vertical bar.
Aspect ratio dependencies of (a) CoPt surface coverage, (b) relative pore circumference, (c) total surface near-saturation magnetization, and (d) normalized surface near-saturation magnetization. Solid lines are guides to the eye. Error bars correspond to .
(a) Field-dependence of the normalized surface Co/Pt magnetization as determined from PNR (open symbols). (b) Comparison of surface and sub-surface Co/Pt magnetizations for the A = 0.7 sample. Error bars correspond to . Lines are guides to the eye.
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