Münster 1999 – wissenschaftliches Programm
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AM: Magnetismus
AM 10: Postersitzung
AM 10.4: Poster
Dienstag, 23. März 1999, 16:15–20:00, F\"urstenberghaus
Time decay of the remanent magnetization in spin glass models at T = 0 — •S. Kobe and J. Kłos — Institut f"ur Theoretische Physik, Technische Universit"at Dresden, D-01062 Dresden
Using the zero-temperature Metropolis-Glauber dynamics the time decay of the remanent magnetization in the ± J Edward-Anderson-Ising spin glass model with a uniform random distribution of ferromagnetic and antiferromagnetic interactions has been investigated. Starting from the saturation the magnetization M reveals a slow decrease with time which can be approximated by a function showing a so-called stretched exponential behaviour: M( t ) = A0+A1exp[−(t/A2)A3]. Moreover, its relaxation towards equilibrium does not lead it into one of the ground states and therefore the system is trapped in a metastable state or in metastable states remaining magnetized for a very long time. Such behaviour is discussed in terms of a random walk the system performs on its available phase space.