SEM [(a), (b), and (d)] bottom (after 200 nm milling) and (c) cross-sectional images of Co [(a), (b), and (c)] NW and (d) NT arrays in NpATs with(a) and [(b), (c), and (d)] and .
FORCs (insets) and FORC diagrams of Co NW and NT ordered hexagonal arrays with different diameters and lattice parameter of , when applying the magnetic field parallel to the wire/tube long axis.
Magnetic interactions, extracted from the FORC diagrams in Fig. 2 , as a function of the wire/tube diameter. Inset shows the cross-section of the FORC diagram along the Hu axis for NW and NT arrays with .
Coercive field along the parallel direction, extracted from the maximum value of the FORC diagrams ( ) in Fig. 2 , and from the major magnetic hysteresis loops ( ), as a function of the NWs/NTs diameter.
Magnetic hysteresis loops of ordered Co NW (left) and NT (right) arrays with and , measured at different angles of H, in steps. Inset shows the angular dependence of squareness (dots—experimental data and line—theoretical calculations).
Angular dependence of the coercive field measured experimentally (dots) and calculated analytically (C mode: black solid; T mode: green dashed; and V mode: orange dotted) for Co NW and NT arrays in NpATs with different outer diameters.
Interaction field values ( ) extracted from the FORC diagrams and respective estimated ( , k) values for Ni NW and NT arrays with different diameters.
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