Abbreviated Journal Title
Phys. Rev. E
GLASS-TRANSITION; SPIN-GLASS; MAGNETIC VISCOSITY; TIME-DEPENDENCE; PARTICLES; SUSCEPTIBILITY; RELAXATION; FILMS; DECAY; Physics, Fluids & Plasmas; Physics, Mathematical
Time decays of low-dimensional magnetic dipoles with anisotropic energy barriers were studied theoretically. We found that the dynamic behaviors are interaction specific. For a chain with ferromagnetic coupling, a single mode dominates and the decay is essentially exponential. For antiferromagnetic coupling, the dynamics can be characterized by two distinct groups of time scales. The spectrum results in a plateau in the decay of remanent magnetization. This novel behavior differs from the prediction of the mean-field theory. For a two-dimensional rectangular lattice, a transition between the bimodal decay and a quasilogarithmic decay occurs when the ratio of length to width varies.
Physical Review E
Sun, J. M. and Luo, Weili, "Dynamics of low-dimensional dipolar systems" (1997). Faculty Bibliography 1990s. 2106.