Anti-ferromagnetic coupling effects on energy barrier and reversal properties of recording media

Author

Wang, P. ; Shan, Z.S. ; Piramanayagam, S.N. ; Chong, T.C.

Author_Institution

Dept. of Media & Mater., Nat. Univ. of Singapore, Singapore

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1445

Lastpage

1448

Abstract

Analytical solutions for coercivity H_CM1, H_CM2, effective (Mrt)_eff, energy-barrier and effective thermal stability factor as a function of coupling constant J and other film parameters have been derived for two coupled ferromagnetic layers (FM-FM layer) with different magnetic properties for the first time. The condition for reduced effective (Mrt)_eff is analyzed. These results are valuable for laminated antiferromagnetically coupled media design. This may open up a channel to raise thermal stability significantly while maintaining lower noise for longitudinal recording media

Keywords

coercive force; exchange interactions (electron); magnetic multilayers; magnetic recording; magnetic switching; magnetisation reversal; thermal stability; antiferromagnetic coupling effects; coercivity; coupled ferromagnetic layers; coupling constant; effective thermal stability factor; energy barrier; laminated antiferromagnetically coupled media; longitudinal recording media; lower noise; magnetic recording media; magnetic switching; reversal properties; Antiferromagnetic materials; Coercive force; Couplings; Energy barrier; Magnetic analysis; Magnetic films; Magnetic properties; Stability analysis; Thermal factors; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950866

Filename

950866