Coercivity and random interfacial exchange coupling in CoPt/Co films

Hard-soft bilayers are analogous to prototype exchange-biased ferromagnetic–antiferromagnetic systems as the minor loop of the soft layer is biased by the hard, and furthermore they offer bias layer tunability. In sputtered CoPt/Co hard-soft bilayers, we demonstrate that the exchange bias field show...

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Veröffentlicht in:Journal of applied physics 2016-03, Vol.119 (12)
Hauptverfasser: Alexandrakis, V., Kechrakos, D., Moutis, N., Niarchos, D., Hadjipanayis, G., Panagiotopoulos, I.
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Sprache:eng
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Zusammenfassung:Hard-soft bilayers are analogous to prototype exchange-biased ferromagnetic–antiferromagnetic systems as the minor loop of the soft layer is biased by the hard, and furthermore they offer bias layer tunability. In sputtered CoPt/Co hard-soft bilayers, we demonstrate that the exchange bias field shows a linear dependence on the hard layer magnetization, while the coercivity shows a quadratic dependence. Analysis of the minor hysteresis loop features supported by Monte-Carlo simulations provides clear evidence that the coercivity of the soft layer is mainly determined by the tunable randomness of the domain state of the hard layer.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4945027