ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The behavior of the magnetization of a fine particle system is partly determined by the interaction effects between the grains. In a previous study by El-Hilo et al., the magnetic particles were considered to be randomly distributed. Many fine particle systems are expected to exhibit a microstructure that has been influenced by intergrain interactions. This effect on the microstructure will be important during the formation of the solid where the magnetic particles exhibit significant mobility. We have developed a 3D Monte Carlo model of a fluid dispersion which after reaching equilibrium is then allowed to "freeze'' to produce a fine particle system with microstructures which vary from clusters in the case of zero field to chains of particles in the saturated field case. This provides an excellent model system for the study of interaction effects. Our previous model is then used to study the resulting magnetic properties of the materials. These include the remanence curves in addition to the hysteresis loops. The local microstructure is shown to have a significant effect on the δI plots which are often used to characterize interaction effects. The simulation of the systems in a solid matrix exhibits an interaction dependent magnetic after effect. Because of the interaction fields, the magnetic configuration also changes with time following a change in temperature leading to a "waiting time'' dependence of magnetic properties, an effect also found in spin glasses. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.362142
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