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

Volume

45

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

2531

Lastpage

2533

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2018685

Filename

4957764