STUDY OF HYSTERESIS PHENOMENA IN ISING-LIKE PSEUDOSPIN SYSTEMS WITH RANDOM LOCAL REVERSAL FIELDS AND RANDOM SPIN-SPIN INTERACTIONS

被引:5
作者
BERTOTTI, G [1 ]
PASQUALE, M [1 ]
机构
[1] GNSM,CISM,INFM,I-10125 TURIN,ITALY
关键词
D O I
10.1063/1.348149
中图分类号
O59 [应用物理学];
学科分类号
摘要
We study the hysteresis properties of a generalization of the Sherrington-Kirkpatrick spin-glass model, including, in addition to the random spin-spin coupling constants {J(ij)}, a random distribution {h(i)c} of local spin coercive fields, hindering spin flipping. The system evolution is driven by the time-dependent external field H(t). We investigate numerically the behavior as a function of H of the average magnetization per spin, m(H), and of the spin internal field distribution P(h;H). A rich variety of m(H) hysteresis loops is obtained, whose properties are controlled by the parameters of the {J(ij)} and {h(i)c} distribution. It is found that the contributions of {J(ij)} and {h(i)c} to the coercive field of these loops simply add to each other. An approximate Fokker-Planck equation for P(h;H) is derived, which permits one to understand the main features of P(h;H). In particular, it leads to a natural interpretation of the fact, put in evidence by computer simulations, that P(h;H) is, for small h, a linear function of h, whose slope is independent of H and of the {h(i)c} distribution.
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页码:5066 / 5068
页数:3
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