Finite-Temperature Magnetization Dynamics in Nanoscale Magnets Greg Brown, Mark A. Novotny, and Per Arne Rikvold Thermal excitations are an important part of magnetization dynamics even in magnets whose dimensions are smaller than one exchange length, for which the paradigm of coherent rotation is usually applied. Thermoinduced magnetization in antiferromagnetic nanoparticles, which involves the q=0 spin-wave mode of the interpenetrating sublattices, is a new an interesting example of this. For slightly larger magnets, thermal effects are important in the magnetization reversal process as regions of locally reversed magnetization are nucleated. The time scales associated with nucleation of these regions, their subsequent growth, and externally applied fields leads to a rich set of observed behaviors in single-domain magnets.