Chin. Phys. Lett.  2000, Vol. 17 Issue (5): 367-369    DOI:
Original Articles |
Transition from Superparamagnetism to Ferromagnetic Single-Domain in a Heisenberg Model for Nano-cluster Magnetic System
SHAO Yuan-Zhi;HE Zhen-Hui
Department of Physics, Zhongshan University, Guangzhou 510275
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SHAO Yuan-Zhi, HE Zhen-Hui 2000 Chin. Phys. Lett. 17 367-369
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Abstract By considering a magnetic system of an ensemble of nanometer clusters without any external magnetic field, the Monte Carlo simulation of the Heisenberg model is used to investigate the transition from a superparamagnetism to a ferromagnetic single-domain state, which is caused by the growth of the clusters. We studied the variation of the dynamic growth exponent P and the transition critical size of the cluster Nc against the reduced temperature t and the uniaxial anisotropy constant A. We found that the growth exponent maximized at a certain temperature, other than being taken as a universal constant as some researchers suggested previously.
Keywords: 75.50.Kj      75.40.Mg      75.10.J     
Published: 01 May 2000
PACS:  75.50.Kj (Amorphous and quasicrystalline magnetic materials)  
  75.40.Mg (Numerical simulation studies)  
  75.10.J  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2000/V17/I5/0367
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