The role of dipolar interactions in AFC-media

We have experimentally studied the role of dipolar interactions in antiferromagnetically coupled (AFC) recording media. In addition to the antiferromagnetic interlayer exchange coupling, recorded transitions lead to dipolar interactions between the two magnetic layers, which also favor an antiparall...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2004-07, Vol.40 (4), p.2437-2439
Main Authors: Berger, A., Moser, A., Margulies, D.T.
Format: Article
Language:English
Subjects:
Antiferromagnetic materials
Automatic frequency control
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Couplings
Disk recording
Exact sciences and technology
Magnetic fields
Magnetic properties and materials
Magnetic recording
Magnetic separation
Magnetism
Magnetization
Magnetostatics
Physics
Soft magnetic materials
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Summary:We have experimentally studied the role of dipolar interactions in antiferromagnetically coupled (AFC) recording media. In addition to the antiferromagnetic interlayer exchange coupling, recorded transitions lead to dipolar interactions between the two magnetic layers, which also favor an antiparallel alignment of the magnetization for longitudinal recording media. For low recording densities, we find a strong increase of the bias field that is acting upon the lower layer with increasing transition density. At an intermediate density, this bias field exhibits a maximum, gaining about 300 Oe over the DC case and slowly decreases upon further increase of the recording density. Our experimental results are in good agreement with model calculations that take both, the dipolar inter- as well as intralayer contributions into account.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.829805