Hysteresis loops of Co–Pt perpendicular magnetic multilayers

We develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automaton model captures cooperative behaviour in the nucleation of magnetic domains. We show how this simple model turns broad hysteresis loops i...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2004-08, Vol.16 (32), p.5897-5906
Main Authors: Mobley, D L, Pike, C R, Davies, J E, Cox, D L, Singh, R R P
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Magnetic properties and materials
Magnetic recording materials
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Physics
Studies of specific magnetic materials
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Summary:We develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automaton model captures cooperative behaviour in the nucleation of magnetic domains. We show how this simple model turns broad hysteresis loops into loops with sharp drops like those observed in these samples, and explains their unusual features. We also present, and experimentally verify, predictions of this model, such as the temperature dependence of the hysteresis loop shape, and the existence and time dependence of drops in first-order reversal curves. We suggest how insights from this model may apply more generally.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/16/32/022