Cylindrical particles with inhomogeneous magnetization profiles: (a) hard-soft composite, (b) graded interface, and (c) semihard magnet. Dark and bright regions correspond to high and low anisotropies, respectively.
Spatial extension of nucleation mode, illustrating the transition from coherent rotation to localized nucleation. The limit of Stoner–Wohlfarth reversal (coherent rotation) corresponds to Fig. 1(c) but is also realized in very small particles irrespective of anisotropy profile.
Nucleation field for several concentration profiles . The three profiles have a common average anisotropy but different nucleation fields. The cases shown in this figure correspond to Fig. 1.
Easy-axis magnetism in exchange-coupled easy-plane magnets (HMSS magnets). Two nanoscale easy-plane magnets with are exchange coupled at an angle of 90° (left), which yields an easy axis magnet with .
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