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) |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
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. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4945027 |