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    
Mohan, C.-V., Kronmüller, H.

Critical phenomena in amorphous thin- and ultrathin-film multilayers
Journal of Magnetism and Magnetic Materials 182, (3),pp 287-296 (1998)
In order to investigate the magnetic phase transition that occurs at the Curie temperature in magnetic thin- and ultrathin-film multilayers, we have carried out extensive magnetization measurements in the temperature range embracing the critical region on amorphous (Tb0.27Dy0.73)0.32Fe0.68 thin- and ultrathin-film multilayers separated by magnetic (Cr) or non-magnetic (Nb) interlayers. These data are analyzed by using the conventional methods like the modified Arrott plots, Kouvel-Fisher method, scaling-equation-of-state analysis and the magnetization isotherm at the Curie point and the critical exponents β, γ and δ which describe the phase transition based on the power laws of the spontaneous magnetization, the initial susceptibility and the critical magnetization isotherm, respectively, have been deduced. Depending on the type of the sample, we could see two types of transitions, either characterized by three-dimensional Heisenberg-like critical exponents or two-dimensional Ising-like. The reasons for this are discussed in detail.

ki-1998-c05