Publications in Scientific Journals:
R. Moreno, R. Evans, S. Khmelevskyi, M.C. Muñoz, R.W. Chantrell, O. Chubykalo-Fesenko:
"Temperature-dependent exchange stiffness and domain wall width in Co";
Physical Review B,
Themicromagnetic exchange stiffness is a critical parameter in numerical modeling ofmagnetization dynamics
and reversal processes, yet the current literature reports a wide range of values even for such simple and widely
used material as cobalt. Using the ab initio estimated Heisenberg parameters we calculate the low temperature
micromagnetic exchange stiffness for hexagonal-close-packed (hcp) and face-centered-cubic cobalt. For hcp Co
they are slightly different in the directions parallel and perpendicular to the c axis. We establish the exchange
stiffness scaling relation with magnetization A(m) ∼ m1.8 valid for a wide range of temperatures. For hcp Co
we find an anisotropic domain wall width in the range 24-29 nm which increases with temperature. The results
form a critical input for large-scale temperature-dependent micromagnetics simulations and demonstrate the
importance of correct parametrization for accurate simulation of magnetization dynamics.
Created from the Publication Database of the Vienna University of Technology.