Title :
Temperature Dependence of Magnetic Properties in Epitaxial FePt/FeRh Bilayer
Author :
Nam, Nguyen T. ; Lu, W. ; Suzuki, T.
Author_Institution :
Inf. Storage Mater. Lab., Toyota Technol. Inst., Nagoya
fDate :
6/1/2009 12:00:00 AM
Abstract :
A systematic investigation of structural and magnetic properties of FePt/FeRh bilayers on dependence of temperature has been carried out. The transition temperature of single FeRh layer was higher than that of FePt/FeRh bilayer. A sharp decrease in coercivity is observed at transition temperature for FePt/FeRh bilayer. The thickness FePt and FeRh dependence of exchange bias field and unidirectional anisotropy constant are discussed. Of interest is that the exchange bias effect appears in FePt/FeRh bilayer and unidirectional anisotropy constant is very large up to 1 erg/cm 2, suggesting that this system can be applied to spin-valve sensors and heat assisted magnetic recording medium.
Keywords :
antiferromagnetic materials; coercive force; ferromagnetic materials; ferromagnetic-antiferromagnetic transitions; iron alloys; magnetic anisotropy; magnetic epitaxial layers; magnetic recording; platinum alloys; rhodium alloys; FePt-FeRh; antiferromagnetic-ferromagnetic transition temperature; coercivity; epitaxial bilayer; exchange bias field; heat assisted magnetic recording medium; spin-valve sensors; unidirectional anisotropy constant; Exchange bias; FePt/FeRh bilayer; FeRh thin films; first-order phase transition;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2018685
