Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

Wang, Wei-Hsiang; Liu, Chak-Ming; Chuang, Tsu‐Yi; Wei, Der-Hsin; Lin, Wen-Chin; Jiang, Pei

doi:10.1016/j.surfin.2021.101582

Cited by 2 publications

(2 citation statements)

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“…(The measurement of a minor hysteresis loop at the first step exhibits no exchange bias (see the Supporting Information), indicating that there is no observable coupling between the two FM sources. , ) This two-step reversal is absent from loop C, which implies modification of the film properties induced by plasma pretreatment on area A. It is known from our previous studies that plasma pretreatment triggers faster surface oxidation of the CoPd film, and oxidation leads to a reduction in the coercive field H c . Therefore, the first and second steps of the reversal in area A are attributed to the top partially oxidized layer and the bottom CoPd layer, respectively, as illustrated in Figure b.…”

Section: Experimental Results and Discussionmentioning

confidence: 88%

“…It is known from our previous studies that plasma pretreatment triggers faster surface oxidation of the CoPd film, and oxidation leads to a reduction in the coercive field H c . 43 Therefore, the first and second steps of the reversal in area A are attributed to the top partially oxidized layer and the bottom CoPd layer, respectively, as illustrated in Figure 2b. As plasma treatment and the follow-up oxidation can induce segregation and migration of some Co atoms in the film to form Co oxides on the surface, a thin layer of Pd-rich phase is established above the bottom CoPd layer underneath the oxides.…”

Section: Resultsmentioning

confidence: 94%

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

Wang

Pan

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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Array-patterned CoPd-based heterostructures are created through e-beam lithography and plasma pretreatment that induces oxidation with depth gradient in the CoPd alloy films, breaking the central symmetry of the structure. Effects on the magnetic properties of the follow-up hydrogenation of the thin film are observed via magneto-optic Kerr effect microscopy. The system exhibits a strong vertical and lateral antiferromagnetic coupling in the perpendicular component between the areas with and without plasma pretreatment, and asymmetric domain-wall propagation in the plasma-pretreated areas during magnetization reversal. These phenomena exhibit evident magnetic chirality and can be interpreted with the Ruderman–Kittel–Kasuya–Yosida coupling and the Dzyaloshinskii–Moriya interaction (DMI). The sample processing demonstrated in this study allows easy incorporation of lithography techniques that can define areas with or without DMI to create intricate magnetic patterns on the sample, which provides an avenue toward more sophisticated control of canted spin textures in future spintronic devices.

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Section: Experimental Results and Discussionmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 94%