Publications in Scientific Journals:
A. Donges, S. Khmelevskyi, A. Deak, R. Abrudan, D. Schmitz, I. Radu, F. Radu, L. Szunyogh, U. Nowak:
"Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo5: Multiscale modeling and element-specific measurements";
Physical Review B,
We use a multiscale approach linking ab initio calculations for the parametrization of an atomistic spin model
with spin dynamics simulations based on the stochastic Landau-Lifshitz-Gilbert equation to investigate the
thermal magnetic properties of the ferrimagnetic rare-earth transition-metal intermetallic DyCo5. Our theoretical
findings are compared to elemental resolved measurements on DyCo5 thin films using the x-ray magnetic circular
dichroism technique. With our model, we are able to accurately compute the complex temperature dependence
of the magnetization. The simulations yield a Curie temperature of TC = 1030 K and a compensation point
of Tcomp = 164 K, which is in a good agreement with our experimental result of Tcomp = 120 K. The spin
reorientation transition is a consequence of competing elemental magnetocrystalline anisotropies in connection
with different degrees of thermal demagnetization in the Dy and Co sublattices. Experimentally, we find this spin
reorientation in a region from TSR1,2 = 320 to 360 K, whereas in our simulations the Co anisotropy appears to
be underestimated, shifting the spin reorientation to higher temperatures.
Created from the Publication Database of the Vienna University of Technology.