Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
89 (2001), S. 3403-3407
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The hysteresis of composite systems consisting of nanosized ferromagnetic particles embedded in a nonmagnetic metal matrix is studied using the Monte Carlo method. In the model, the nanosized particles are assumed to be single domain and to possess random uniaxial anisotropy. The particles are well dispersed so that the interactions between them are weak and can be neglected. These particles may be superparamagnetic (unblocked) or not (blocked) depending on the temperature T, energy barrier ΔE, and measurement time τm. It is found that the hysteresis loop, which is obtained even in the absence of interparticle interactions, is mainly caused by the blocked particles as a result of the irreversible transitions between states of minimum energy. The remanence and coercivity of such systems decrease as T increases and disappear at high T. The results are in agreement with recent experimental observations. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1348326
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