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For collections of noninteracting nanoparticles, we study the reduced static remanent magnetization, m R , produced by the removal of a saturating magnetic field. We show that, except for special cases such as easy uniaxial anisotropy, m R depends on both the ramp-down rate of the field and the energy dissipation rate of the spin dynamics. Using the Landau-Lifshitz equation, we illustrate...