Projective Dynamics Analysis of Magnetization Reversal.pdfVIP

Projective Dynamics Analysis of 3 Magnetization Reversal 0 0 2 n u Gregory Brown a,∗, M. A. Novotny b , Per Arne Rikvold c J 6 a Center for Computational Sciences, Oak Ridge National Lab, ] h Oak Ridge, TN 37831-6114, USA c School of Computational Science and Information Technology, e m Florida State University, Tallahassee, FL 32306-4120, USA - b Department of Physics and Astronomy and t a ERC Center for Computational Sciences, t s Mississippi State University, MS 39762, USA . t a c Department of Physics, CSIT, and MARTECH, m Florida State University, Tallahassee, FL 32303-4350, USA - d n o c [ Abstract 1 v The computational Projective Dynamics method is used to analyze simulations of 8 magnetization reversal in nanoscale magnetic pillars. It is shown that this method 6 can be used to determine the magnetizations corresponding to the metastable min- 1 6 imum and saddle point in the free energy, and the free-energy barrier associated 0 with those points. For the nanopillars studied here, entropy is found to provide 3 a significant contribution to the free-energy barrier which determines the reversal 0 / time scale. t a m Key words: Magnetization Reversal, Projective Dynamics, Micromagnetics - d n o c : Understanding magnetization reversal is important for technological applica- v i tions where the magnetic orientation of nanoscale regions must be quickly X