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.
SHAO Yuan-Zhi;HE Zhen-Hui. Transition from Superparamagnetism to Ferromagnetic Single-Domain in a Heisenberg Model for Nano-cluster Magnetic System[J]. 中国物理快报, 2000, 17(5): 367-369.
SHAO Yuan-Zhi, HE Zhen-Hui. Transition from Superparamagnetism to Ferromagnetic Single-Domain in a Heisenberg Model for Nano-cluster Magnetic System. Chin. Phys. Lett., 2000, 17(5): 367-369.
2000, Vol. 17 
