Fluctuation of Microscopic Patterns in Spin Systems at Near Critical Temperatures (I)

S. Ozawa¹, M. Itaba¹, T. Kobayashi² and T. Haseda²

¹Faculty of Engineering, Ibaraki University, Nakanarusawa, Hitachi 316, Japan
²Faculty of Engineering, Toin University of Yokohama, Kurogane, Midoriku, Yokohama 227, Japan

(Received February 6, 1992; Accepted May 7, 1992)

Keywords: Fluctuation, Ising model, Spin system, Critical phenomena, Monte Carlo method

Abstract. Abstract. Dynamics of microscopic spin patterns in 2-dimensional Ising system was studied by the Monte Carlo computer experiment. The origin of curious memory effect and hysteresis phenomena found previously in the studies of spontaneous magnetization of weak ferromagnetic materials and known as the Temperature Barkhausen Effect was discussed on the basis of the results of the computer experiment.