HRTEM study of microstructure-coercivity relationship in perpendicular Co25Pd75 thin films

Komninou, Ph.; Oikonomou, Ilias M.; Clark, Billy D.; Abugri, Joseph B.; Tippey, Kristin; Visscher, P. B.; Gupta, Subhadra

doi:10.1016/j.jmmm.2021.167816

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Strong PMOKE signals shown in Figure h indicate prominent perpendicular magnetization after hydrogen exposure and evacuation. It has been found in our previous study that the magnetic anisotropy is dominated by PMA for CoPd films with thicknesses of ≲10 nm, which can be attributed to the tetragonal L 1 0 ordering in the CoPd alloy − even on the short-range scale, , and to the interfacial anisotropy or strain. − Oxidation diminishes PMA, but hydrogenation afterward can enhance PMA with proper hydrogen concentrations. ,− The perpendicular magnetization under in-plane fields after hydrogenation can be attributed to the PMA and the long-range coupling induced by hydrogenation that modulates the electronic structure and orbital moments of the alloy atoms. Indirect exchange coupling of Co magnetic moments is established via the conduction electrons of Pd between Co atoms, and the uptake of hydrogen changes the electronic structure of Pd and accordingly the interaction.…”

Section: Experimental Results and Discussionmentioning

confidence: 89%

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: 89%

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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show abstract

“…By addition and subtraction of the MOKE images from the opposite directions of oblique incidence, a pure polar image and a pure longitudinal image can be obtained, respectively. 39 The hysteresis loops in the top figures which can be attributed to the tetragonal L1 0 ordering in the CoPd alloy [51][52][53] even on the short-range scale, 53,54 and to the interfacial anisotropy or strain. [55][56][57][58][59][60] Oxidation diminishes PMA, 36 but hydrogenation afterward can enhance PMA with proper hydrogen concentrations.…”

Section: Antiferromagnetic Coupling Observed In the Polar Moke Hyster...mentioning

confidence: 99%

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

Wang,

Pan,

Liu

et al. 2022

Preprint

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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 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 phenomenon 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

show abstract

HRTEM study of microstructure-coercivity relationship in perpendicular Co25Pd75 thin films

Cited by 2 publications

References 15 publications

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

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

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

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