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R. Dittrich, T. Schrefl, D. Süss, W. Scholz, H. Forster, J. Fidler:
"Thermally induced magnetization reversal in antiferromagnetically coupled media";
Journal of Applied Physics, 93 (2003), No. 10; 7405 - 7407.

Thermally induced magnetization reversal in antiferromagnetically coupled media

Rok Dittrich, Thomas Schrefl, Dieter Suess, Werner Scholz, Hermann Forster, and Josef Fidler
Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria

The calculation of energy barriers between stable equilibrium states in strongly interacting systems requires the calculation of saddle points in high dimensional energy landscapes. We combine the nudged elastic band method with finite element micromagnetics to calculate optimal paths, giving a global view of thermal switching in antiferromagnetically coupled media. Energy barriers and transition rates can be estimated from the saddle points and the energy minima along this path. We investigate the dependence of the energy barrier on the strength of the antiferromagnetic coupling and study the reversal in the data bit transition region. Below 1.1 mJ/m2 a two step reversal occurs passing a metastable state. Above 1.1 mJ/m2 this metastable state disappears and the energy barrier is constant for a coupling strength greater than 1.5 mJ/m2. ©2003 American Institute of Physics.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970150

http://link.aip.org/link/?JAP/93/7405&agg=silverplatter