Abstract
Low-temperature magnetic relaxation phenomena have been studied in two samples consisting of nanocrystalline γ-Fe2O3 and polymer in either water (as ferrofluid) or in potassium silicate (as glass). The relaxation of the magnetization follows a logarithmic law and the magnetic viscosity, S, tends to be independent of temperature below 2.1 K for the glass sample, giving evidence of macroscopic quantum tunneling of the magnetization.
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