Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers

Junho Park; Taehyun Kim; Gyu Won Kim; Vladimir Bessonov; Andrey Telegin; Ilia G. Iliushin; Anastasiia A. Pervishko; Dmitry Yudin; Aleksei Yu Samardak; Alexey V. Ognev; Alexander S. Samardak; Jiung Cho; Young Keun Kim

doi:10.1016/j.actamat.2022.118383

Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers

Junho Park, Taehyun Kim, Gyu Won Kim, Vladimir Bessonov, Andrey Telegin, Ilia G. Iliushin, Anastasiia A. Pervishko, Dmitry Yudin, Aleksei Yu Samardak, Alexey V. Ognev, Alexander S. Samardak, Jiung Cho, Young Keun Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The Dzyaloshinskii–Moriya interaction (DMI) is an antisymmetric exchange in magnetic structures with broken inversion symmetry. In magnetic heterostructures, the bulk DMI may coexist with the conventional interfacial DMI contributing to the chiral magnetic behavior of the system. Here, we report the enhancement of DMI in Pt/Co heterostructures wherein Pt-Co alloy intralayers with compositional gradients are sandwiched between Pt and Co. Due to the composition gradient-induced bulk magnetic asymmetry and the face-centered cubic (fcc) (111) multilayer crystal structure, the DMI shows a complex behavior attributed to both the interfacial (i-DMI) and bulk-like (b-DMI) contributions. While the b-DMI is defined by the presence of composition differences and structure symmetry, the i-DMI hosts the interfacial contributions in the multilayer structure. Our approach allows the creation of graded magnetic thin films, where the structural inversion symmetry is broken solely due to the predefined compositional gradient of an intralayer, thereby giving rise to an ‘all-interface-bulk’ DMI with the controllable spatial distribution.

Original language	English
Article number	118383
Journal	Acta Materialia
Volume	241
DOIs	https://doi.org/10.1016/j.actamat.2022.118383
Publication status	Published - 2022 Dec

Keywords

Dzyaloshinskii-Moriya interaction
Interface
Microstructure
Pt-Co alloy layer

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2022.118383

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Park, J., Kim, T., Kim, G. W., Bessonov, V., Telegin, A., Iliushin, I. G., Pervishko, A. A., Yudin, D., Samardak, A. Y., Ognev, A. V., Samardak, A. S., Cho, J., & Kim, Y. K. (2022). Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers. Acta Materialia, 241, [118383]. https://doi.org/10.1016/j.actamat.2022.118383

Park, J, Kim, T, Kim, GW, Bessonov, V, Telegin, A, Iliushin, IG, Pervishko, AA, Yudin, D, Samardak, AY, Ognev, AV, Samardak, AS, Cho, J & Kim, YK 2022, 'Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers', Acta Materialia, vol. 241, 118383. https://doi.org/10.1016/j.actamat.2022.118383

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title = "Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers",

abstract = "The Dzyaloshinskii–Moriya interaction (DMI) is an antisymmetric exchange in magnetic structures with broken inversion symmetry. In magnetic heterostructures, the bulk DMI may coexist with the conventional interfacial DMI contributing to the chiral magnetic behavior of the system. Here, we report the enhancement of DMI in Pt/Co heterostructures wherein Pt-Co alloy intralayers with compositional gradients are sandwiched between Pt and Co. Due to the composition gradient-induced bulk magnetic asymmetry and the face-centered cubic (fcc) (111) multilayer crystal structure, the DMI shows a complex behavior attributed to both the interfacial (i-DMI) and bulk-like (b-DMI) contributions. While the b-DMI is defined by the presence of composition differences and structure symmetry, the i-DMI hosts the interfacial contributions in the multilayer structure. Our approach allows the creation of graded magnetic thin films, where the structural inversion symmetry is broken solely due to the predefined compositional gradient of an intralayer, thereby giving rise to an {\textquoteleft}all-interface-bulk{\textquoteright} DMI with the controllable spatial distribution.",

keywords = "Dzyaloshinskii-Moriya interaction, Interface, Microstructure, Pt-Co alloy layer",

author = "Junho Park and Taehyun Kim and Kim, {Gyu Won} and Vladimir Bessonov and Andrey Telegin and Iliushin, {Ilia G.} and Pervishko, {Anastasiia A.} and Dmitry Yudin and Samardak, {Aleksei Yu} and Ognev, {Alexey V.} and Samardak, {Alexander S.} and Jiung Cho and Kim, {Young Keun}",

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year = "2022",

month = dec,

doi = "10.1016/j.actamat.2022.118383",

language = "English",

volume = "241",

journal = "Acta Materialia",

issn = "1359-6454",

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T1 - Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers

AU - Park, Junho

AU - Kim, Taehyun

AU - Kim, Gyu Won

AU - Bessonov, Vladimir

AU - Telegin, Andrey

AU - Iliushin, Ilia G.

AU - Pervishko, Anastasiia A.

AU - Yudin, Dmitry

AU - Samardak, Aleksei Yu

AU - Ognev, Alexey V.

AU - Samardak, Alexander S.

AU - Cho, Jiung

AU - Kim, Young Keun

PY - 2022/12

Y1 - 2022/12

N2 - The Dzyaloshinskii–Moriya interaction (DMI) is an antisymmetric exchange in magnetic structures with broken inversion symmetry. In magnetic heterostructures, the bulk DMI may coexist with the conventional interfacial DMI contributing to the chiral magnetic behavior of the system. Here, we report the enhancement of DMI in Pt/Co heterostructures wherein Pt-Co alloy intralayers with compositional gradients are sandwiched between Pt and Co. Due to the composition gradient-induced bulk magnetic asymmetry and the face-centered cubic (fcc) (111) multilayer crystal structure, the DMI shows a complex behavior attributed to both the interfacial (i-DMI) and bulk-like (b-DMI) contributions. While the b-DMI is defined by the presence of composition differences and structure symmetry, the i-DMI hosts the interfacial contributions in the multilayer structure. Our approach allows the creation of graded magnetic thin films, where the structural inversion symmetry is broken solely due to the predefined compositional gradient of an intralayer, thereby giving rise to an ‘all-interface-bulk’ DMI with the controllable spatial distribution.

AB - The Dzyaloshinskii–Moriya interaction (DMI) is an antisymmetric exchange in magnetic structures with broken inversion symmetry. In magnetic heterostructures, the bulk DMI may coexist with the conventional interfacial DMI contributing to the chiral magnetic behavior of the system. Here, we report the enhancement of DMI in Pt/Co heterostructures wherein Pt-Co alloy intralayers with compositional gradients are sandwiched between Pt and Co. Due to the composition gradient-induced bulk magnetic asymmetry and the face-centered cubic (fcc) (111) multilayer crystal structure, the DMI shows a complex behavior attributed to both the interfacial (i-DMI) and bulk-like (b-DMI) contributions. While the b-DMI is defined by the presence of composition differences and structure symmetry, the i-DMI hosts the interfacial contributions in the multilayer structure. Our approach allows the creation of graded magnetic thin films, where the structural inversion symmetry is broken solely due to the predefined compositional gradient of an intralayer, thereby giving rise to an ‘all-interface-bulk’ DMI with the controllable spatial distribution.

KW - Dzyaloshinskii-Moriya interaction

KW - Interface

KW - Microstructure

KW - Pt-Co alloy layer

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DO - 10.1016/j.actamat.2022.118383

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JO - Acta Materialia

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ER -

Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers

Abstract

Keywords

ASJC Scopus subject areas

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