Temporal and Temperature Variations of DC Magnetic Aftereffect Mesurements of Fe3O4 Powders
H. Seyoum, Lawrence H. Bennett, Edward Della Torre
The temperature variation of the magnetic relaxation process obtained from DC magnetization measurements are investigated in fine Fe3O4 powder in the temperature range 5 K < T < 300 K. The maximum decay rate, S= d(M)/d[ln(t)], shows two distinct relaxation processes. The two processes remarkably display same pronounced peaks at 10, 35, 60 and 85 K below Verwey transition (TV) and different behavior above TV. At the same time, high field irreversibility in M (T) curves in zero-field cooled and field cooled (ZFC-FC) processes and considerable increase in coercivity have also been observed below TV. This is related to the freezing of disordered spins in a reorganization of domain structure.
Journal of Applied Physics
DC magnetic aftereffect measurement, magnetic relaxation, temperature variations, temporal variations
, Bennett, L.
and Della Torre, E.
Temporal and Temperature Variations of DC Magnetic Aftereffect Mesurements of Fe<sub>3</sub>O<sub>4</sub> Powders, Journal of Applied Physics
(Accessed June 9, 2023)