Harris, A. BrooksRastelli, EnricoTassi, Armando2023-05-232023-05-231990-05-012015-07-07https://repository.upenn.edu/handle/20.500.14332/43003We consider a Heisenberg model with ferromagnetic nearest‐neighbor and competing further‐neighbor exchange interactions in a small applied magnetic field at low temperature T. As a function of the exchange constants, the modulation vector is shown to have devil’s staircase behavior. We consider the effects of nonzero temperature and quantum effects. We find a special modulation wave vector at which the incommensurability energy vanishes for the classical system at T=0.Reprinted with permission from Journal of Applied Physics. Copyright 1990, American Institute of Physics.PhysicsArticle