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DYNAMICAL MAGNETIC PROPERTIES OF IRON - NITRIDE MAGNETIC FLUIDS
H.Mamiya,I.Nakatani 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Ac susceptibility of iron-nitride magnetic fluids with various particle number densities was measured. The relaxation time increases rapidly as the temperature decreases or the inter-particle interaction increases. The analysis of the data suggests that the activation energy is proportional to (k_BT/Jtyp)^α with α ~-0.24 in the lower temperature range in which the thermal energy is comparable to the magnetic dipole interaction.