期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 264, 期 1, 页码 14-29出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(03)00131-8
关键词
memory effects; magnetic; ultra-thin film; time dependence; dynamics
Monte Carlo studies of a uniaxial spin system on a square lattice with both ferromagnetic exchange interactions and dipolar interactions reveal three distinct dynamical regimes at low temperatures. In the first regime the magnetization decays through nucleation and growth of spin islands, in the second regime, despite the magnetization being effectively zero, there is a persistent memory effect most clearly revealed by the asymmetry between the numbers of up and down islands. The third regime is characterized by slow crystallization of the equilibrium smectic phase from the quenched polycrystalline state. (C) 2003 Elsevier Science B.V. All rights reserved.
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