Direct observation of field and temperature induced domain replication in dipolar coupled perpendicular anisotropy films
Résumé
Dipolar interactions in a soft/Pd/hard ͓CoNi/ Pd͔ 30 / Pd/ ͓Co/ Pd͔ 20 multilayer system, where a thick Pd layer between two ferromagnetic units prevents direct exchange coupling, are directly revealed by combining mag-netometry and state-of-the-art layer resolving soft x-ray imaging techniques with sub-100-nm spatial resolution. The domains forming in the soft layer during external magnetic field reversal are found to match the domains previously trapped in the hard layer. The low Curie temperature of the soft layer allows varying its intrinsic parameters via temperature and thus studying the competition with dipolar fields due to the domains in the hard layer. Micromagnetic simulations elucidate the role of ͓CoNi/Pd͔ magnetization, exchange, and anisotropy in the duplication process. Finally, thermally driven domain replication in remanence during temperature cycling is demonstrated.
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