Micromagnetic simulation method with N1.5 scaling

A thin permalloy film with dimensions of 1 mu mX2 mu mX20 nm was simulated with a new three- dimensional method. The method is designed in such a way that the computing time scales roughly as N-1.5 in the number N of discretization elements used to describe the system. The Poisson equation is solved by a relaxation procedure and the energy is minimized with a damped molecular dynamics algorithm. (C) 1999 American Institute of Physics. [S0021-8979(99)40908-9].