1992    
1993    
1994    
1995    
1996    
1997    
1998    
1999    
2000    
2001    
2002    
2003    
2004    
2005    
2006    
2007    
2008    
2009    
2010    
2011    
2012    
2013    
2014    
2015    
2016    
Yildiz, F., Przybylski, M., Kirschner, J.

Volume contribution to perpendicular anisotropy in Fe0.5Co0.5 alloy films on Pd(001), Ir(001), and Rh(001)
Journal of Applied Physics 105, (7),pp 07E129/1-3 (2009)
In tetragonally distorted Fe0.5Co0.5 alloy films grown epitaxially on Pd(001), Ir(001), and Rh(001) substrates the crystal field locates the electronic states near the Fermi level (EF) with one being below EF and the other above EF with an energy separation smaller than in bulk nondistorted material. This results in a strong uniaxial anisotropy and an easy magnetization axis perpendicular to the film plane up to the thickness up to which the films remain tetragonally distorted. The strongest perpendicular anisotropy is achieved when the Fe0.5Co0.5 films are grown on Rh(001) (c/a=1.24); it systematically decreases for Ir(001) (c/a=1.18) and Pd(001) (c/a=1.13) substrates. The phenomenon can be understood as a result of an increasing uniaxial anisotropy with an increasing c/a ratio up to the maximum at c/a=1.24 for which the maximum uniaxial magnetic anisotropy has been theoretically predicted.