Magnetization reversal processes linked to interphase exchange and dipolar coupling in hard-soft nanocomposite magnets

We present simulation results on the behavior of simple nanocomposite hard-soft magnets. In particular, we have investigated the coercive force of single and coupled triads of hard-soft-hard grains having different bulk exchange constants, intergrain exchange coefficients, saturation magnetization, and local easy axis orientations. These systems are described by a micromagnetic model. taking into account anisotropy, Zeeman, exchange, and dipolar energies. Their dynamics were followed by a Monte Carlo-Metropolis algorithm. (C) 1997 American Institute of Physics.