How antiferromagnetic coupling can stabilize recorded information

Author

Richter, H.J. ; Girt, E.

Author_Institution

Seagate Recording Media, Fremont, CA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

1867

Lastpage

1872

Abstract

Antiferromagnetic coupling (AFC) can be used to stabilize recorded information because it: 1) reduces the demagnetizing fields at storage and 2) increases the energy barrier against magnetization reversal. It is shown that weak AFC is most advantageous and that both mechanisms work for superparamagnetic stabilization layers. It is also shown that the stabilization layer is recorded during the write process. The relaxation to the antiferromagnetic state is observed experimentally.

Keywords

RKKY interaction; antiferromagnetism; coercive force; demagnetisation; magnetic recording; magnetic switching; magnetisation reversal; superparamagnetism; thermal stability; CoCrPtB; CoCrPtB alloys; RKKY interaction; antiferromagnetic coupling; antiferromagnetic state relaxation; demagnetizing fields; longitudinal recording technology; magnetization reversal energy barrier; recorded information stabilization; superparamagnetic stabilization layers; switching field distribution; thermal stability; write process; Anisotropic magnetoresistance; Antiferromagnetic materials; Automatic frequency control; Energy barrier; Magnetic anisotropy; Magnetic recording; Magnetization reversal; Perpendicular magnetic anisotropy; Saturation magnetization; Semiconductor process modeling;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801785

Filename

1042031