Theory Department
Max Planck Institute of Microstructure Physics
1997    
1998    
1999    
2000    
2001    
2002    
2003    
2004    
2005    
2006    
2007    
2008    
2009    
2010    
2011    
2012    
2013    
2014    
2015    
2016    
2017    
2018    
2019    
2020    
2021    
Sandratskii, L. M.

Orbital magnetism and magnetic anisotropy in thin-film ferromagnets disturbed from the ground state
Physical Review B 88, (6),pp 064415/1-6 (2013)
We report first-principles study of the orbital magnetism and magnetic anisotropy energy (MAE) in ultrathin films of Fe, Co, and FePt disturbed from the ferromagnetic ground state. The deviation of ferromagnetic spin configurations from the easy axis leads to the noncollinearity of the spin and orbital moments. In Fe and Co, this noncollinearity correlates with the magnitude of MAE. In contrast, in FePt a complex interplay of competing processes leads to unusual phenomenon of the orthogonality of the inducing spin and induced orbital moments. Considering the influence of noncollinearity of spin moments we obtain opposite trends in the MAE variation for Fe and Co films. This finding correlates with the absence of universal temperature behavior of MAE in itinerant magnets and is shown to originate in the variation of the electronic structure with the change of spin configuration.

TH-2013-25