“…However, once a certain threshold is overcome, the coercivity starts to decrease, in agreement with Jung et al [22] who found a constantH C for a range of small to mid n, and then a reducedH C for large n. To explain this effect, let us assume a perfect square hysteresis cycle with a coercive field given by the perpendicular anisotropy field given by (in Oe) H A ≡ 2K ⊥ /M s , where K ⊥ is the perpendicular anisotropy constant (in erg/cc), and M s is the saturation magnetization of the magnetic material (in emu/cc). Increasing n affects mostly the volume, and thus H A (and consequently H c ) remains constant.…”