Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 47, Issue 10, Pages 2482-2485Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2011.2158522
Keywords
Activation energy; demagnetization effect; itinerant electron metamagnetic (IEM) transition; nucleation and growth
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Influence of demagnetization effect on the kinetics of the itinerant electron metamagnetic (IEM) transition in magnetic refrigerant has been investigated by both the static and time-dependent magnetization measurements. From the magnetization measurement by changing the field direction against the longitudinal direction of specimen, the critical magnetic field mu H-0(C) for the IEM transition becomes larger in the setup with a higher demagnetization coefficient. The time dependence of magnetization under constant magnetic field indicates that the progress of both the onset and offset of the IEM transition is completed in the condition with smaller demagnetization effect, meanwhile the arrest of progress is elicited by the larger demagnetization effect. In addition, the Johnson-Mehl-Avrami analysis leads to a 2-D-like growth of the ferromagnetic phase in the paramagnetic matrix. These results reveal that the nucleation and growth process of the IEM transition is affected by the demagnetization effect.
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