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Array-patterned CoPd-based heterostructures are created through e-beamlithography and plasma pretreatment that induces oxidation with depth gradientin the CoPd alloy films, breaking the central symmetry of the structure.Effects on the magnetic properties of the follow-up hydrogenation of the thinfilm are observed via magneto-optic Kerr effect microscopy. The system exhibitsstrong vertical and lateral antiferromagnetic coupling in the perpendicularcomponent between the areas with and without plasma pretreatment, andasymmetric domain-wall propagation in the plasma-pretreated areas duringmagnetization reversal. These phenomenon exhibit evident magnetic chirality andcan be interpreted with the Ruderman-Kittel-Kasuya-Yosida coupling and theDzyaloshinskii-Moriya interaction (DMI). The sample processing demonstrated inthis study allows easy incorporation of lithography techniques that can defineareas with or without DMI to create intricate magnetic patterns on the sample,which provides an avenue towards more sophisticate control of canted spintextures in future spintronic devices.

Chirality-Induced Noncollinear Magnetization and Asymmetric Domain-Wall Propagation in Hydrogenated CoPd Thin Films