Numerische Berechnung von Spin-Korrelationsfunktionen und Magnetisierungskurven von Ferromagnetica

The static correlation functions and the magnetization curves of finite (125–1000 spins) Ising- and Heisenberg-ferromagnets are calculated using a Monte-Carlomethod for all temperatures. We assumeS=∞, a simple cubic lattice and nearest neighbours interactions. Various theoretical assumptions concerning the correlation functions and the magnetization may be examined by means of the calculated results. Magnetization curves for superparamagnetic systems were computed also.