Monte carlo simulation of magnetization and coercivity of free magnetic clusters |
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Authors: | Huang Zhi-Gao Chen Zhi-Gao Jiang Li-Qin Ye Qing-Ying and Wu Qing-Yun |
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Institution: | Department of Physics, Fujian Normal University, Fuzhou 350007, China |
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Abstract: | Based on Monte Carlo method, the oscillatory behaviour of the
average magnetic moment as a function of the cluster sizes and the
temperature dependences of magnetic moment with different sizes have
been studied. It is found that the oscillations superimposed on the
decreasing moment are associated with not only the geometrical
structure effects but also the thermal fluctuation. The hystereses
and thermal coercivities for free clusters with zero and finite
uniaxial anisotropies have been calculated. The simulated thermal
dependence of the coercivity is consistent with the experimental
result, but does not fit the Tα law in the whole temperature
range. It is evident that an easy magnetization direction and an
anisotropy resulting from the spin configurations exist in the free
clusters with the pure exchange interaction, which is also proved by
the natural angle and energy distribution of clusters. A systematic
theoretical analysis is also made to establish the relationship
between natural angle and coercivity. |
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Keywords: | Monte Carlo cluster magnetization hysteresis |
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