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TEM image of FePt nanoparticles having diameters of (a) and (b) .
Hysteresis loops of FePt particles of different sizes.
Nucleation modes in spherical particles: (a) coherent rotation, (b) example of a low-lying asymmetric excited mode, (c) lowest-lying symmetric excited mode, and (d) typical situation in practice. Bright and dark regions denote magnetization components perpendicular magnetization components of opposite directions, and the small dot in (d) is a structural imperfection.
Simulated loops. The gray area is the magnetization of the shell of the particle. The small “jumps” in the loop mean that groups of cells switch in a coordinated manner. The jumps depend on the cell size and can be shown to smooth on ensemble averaging.
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