Remanent magnetization in spin-glasses

摘要: A spin-glass model consisting of a kinetic Ising with random nearest-neighbor interactions is studied by Monte Carlo methods. As in real experiments the system cooled, and magnetic field applied then switched off. Below freezing temperature ${T}_{f}$ both an irreversible reversible susceptibility are observed. remanent magnetization $M$ occurs which decays very slowly time $t$ power law $M\ensuremath{\sim}{t}^{\ensuremath{-}a}$ to equilibrium value $M=0$. For different cooling procedures magnetizations discussed as function previously field. characteristic difference between cooled (TRM) isothermal (IRM) observed dependence exponent $a$. Many predictions resemble experimental results. In second part exactly solvable incorporating symmetric distribution frustration introduced. Since range infinite there exist no local clusters this model. phase transition cusp susceptibility, magnetization, ferromagnet---spin-glass found.