Title: Parameter scaling for thermal effects in micromagnetics

Abstract: Numerical solutions of the micromagnetic Landau-Lifshitz-Gilbert 
equations provide valuable information at low temperatures (T), but 
produce egregious errors at higher T. For example, Curie temperatures are 
often overestimated by an order of magnitude.  In this talk, we show that 
these errors result from the use of block or coarse-grained variables, 
without a concomitant renormalization of the system parameters to account 
for the block size. Renormalization solves the problem of the Curie-point 
anomaly, and improves the accuracy of more complicated micromagnetic 
simulations, even at low T.  

In this talk we will compare results of simulations with and without 
renormalization corrections. We will also discuss various approaches to 
integrating the renormalized LLG equations with thermal noise.  Finally if 
there is time, we will compare the results of physically measurable 
quantities such as the activation lifetime with and without 
renormalization corrections.