Abstract
There is a growing interest, inspired by advances in technology, in the low temperature physics of thin films. These quasi-2D systems show a wide range of ordering effects including formation of striped states, reorientation transitions, bubble formation in strong magnetic fields, etc. The origins of these phenomena are, in many cases, traced to competition between short ranged exchange ferromagnetic interactions, favoring a homogeneous ordered state, and the long ranged dipole-dipole interaction, which opposes such ordering on the scale of the whole sample. The present theoretical understanding of these phenomena is based on a combination of variational methods and a variety of approximations, e.g., mean-field and spin-wave theory. The comparison between the predictions of these approximate methods and the results of MonteCarlo simulations are often difficult because of the slow relaxation dynamics associated with the long-range nature of the dipole-dipole interactions. In this note we will review recent work where we prove existence of periodic structures in some lattice and continuum model systems with competing interactions. The continuum models have also been used to describe micromagnets, diblock polymers, etc.
Original language | English (US) |
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Pages (from-to) | 44-54 |
Number of pages | 11 |
Journal | AIP Conference Proceedings |
Volume | 1091 |
DOIs | |
State | Published - 2009 |
Event | 10th Granada Lectures on Modeling and Simulation of New Materials - Granada, Spain Duration: Sep 15 2008 → Sep 19 2009 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
Keywords
- Ising model
- Reflection positivity
- Striped order
- periodic ground state