Journal
ACTA MATERIALIA
Volume 241, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2022.118383
Keywords
Pt-Co alloy layer; Microstructure; Interface; Dzyaloshinskii-Moriya interaction
Funding
- National Research Foundation of Korea - Ministry of Science and ICT [2020M3F3A2A01082591]
- Samsung Electronics Co., Ltd. [IO201211-08104-01]
- Russian Science Foundation [21-72-20160, 22-11-00074]
- Global Ph.D. Fellowship Program through the National Research Foundation of Korea - Ministry of Education [2018H1A2A1062616]
- Russian Ministry of Science and Higher Education [075-15-2021-607]
- Russian Foundation for Basic Research [19-32-60020]
- Russian Federation President Scholarship for Young Scientists [SP-1640.2021.5]
- National Research Foundation of Korea [2018H1A2A1062616] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The Dzyaloshinskii-Moriya interaction (DMI) is enhanced in Pt/Co heterostructures with compositionally graded Pt-Co alloy intralayers, leading to complex behavior attributed to both interfacial and bulk-like contributions.
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. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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