L. Torres et al., Micromagnetic analysis of recording processes in periodic antidot arrays: Interaction between adjacent bits, J APPL PHYS, 87(9), 2000, pp. 5645-5647
Lithographically defined nonmagnetic structures in thin magnetic films have
been proposed as future ultrahigh density storage systems. Previous invest
igations by our group have shown that these periodic antidot arrays present
adequate remanent states for storage. The optimization of material paramet
ers and geometrical dimensions led to maximum areal densities in the order
of 750 Gbits/in.(2) for materials with exchange lengths in the range of 3 n
m. In this work recording processes are computed. Single bit switching is a
nalyzed by micromagnetic simulations. It is observed how the dipolar and ex
change interactions between adjacent bits play a key role. If the applied f
ield is not carefully controlled or the magnetocrystalline anisotropy inter
action is not strong enough, the switching of one bit can produce undesired
switching of neighboring bits. (C) 2000 American Institute of Physics. [S0
021-8979(00)38508-5].