Dynamics of domains in diluted antiferromagnets

✍ Scribed by U. Nowak; J. Esser; K.D. Usadel

• Book ID: 103896375
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 598 KB
• Volume: 232
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(96)00133-1

✦ Synopsis

We investigate the dynamics of two-dimensional site-diluted Ising antiferromagnets. In an external magnetic field these highly disordered magnetic systems have a domain structure which consists of fractal domains with sizes on a broad range of length scales. We focus on the dynamics of these systems during the relaxation from a long-range ordered initial state to the disordered fractal-domain state after applying an external magnetic field. The equilibrium state with applied field consists of fractal domains with a size distribution which follows a power law with an exponential cutoff. The dynamics of the system can be understood as a growth process of this fractal-domain state in such a way that the equilibrium distribution of domains develops during time. Following these ideas quantitatively we derive a simple description of the time dependence of the order parameter. The agreement with simulations is excellent.