The Effect of the Modulation Period on the Diffusion Intermixing and Magnetic Properties Behavior of Pt/Co Thin Films Induced by Ion Pre-irradiation

Editorial Board PCSS Journal; Andrii Orlov; Roman Pedan; Ivan Kruhlov; Yurii Yavorskyi; Oleksander Dubikovskyi; Oleksander Kosulya; Andrii Bodnaruk; Igor Vladymyrskyi

doi:10.15330/pcss.26.3.489-499

Authors

Andrii Orlov National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Roman Pedan National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Ivan Kruhlov National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine https://orcid.org/0000-0003-2078-4159
Yurii Yavorskyi National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Oleksander Dubikovskyi National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine; V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
Oleksander Kosulya V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
Andrii Bodnaruk National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine; Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine https://orcid.org/0000-0002-8280-0209
Igor Vladymyrskyi National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.3.489-499

Keywords:

Magnetic thin films, Ion irradiation, Diffusion, Co-Pt alloy, Interface, Phase formation

Abstract

The effects of modulation period and N⁺ ion pre-irradiation on the layers intermixing and magnetic properties modification of Pt/Co and Pt/Co/Pt/Co stacks were investigated. The correlation between structural changes, diffusion intermixing, and magnetic properties behavior was discussed as a function of ion fluence. An experimental analysis was performed using X-ray diffraction, secondary ions mass-spectrometry, and in-plane vibrating sample magnetometry characterization. The nonlinear behavior of the saturation magnetization values for the bi- and four-layered stacks was observed. Based on the results of the study, it was found that a significant increase in coercivity (498 Oe) of the four-layered stack after the pre-irradiation with a fluence of 5 × 10¹⁴ ions/cm², related to the ion-induced collisional intermixing and more pronounced formation of the structural defects. It was demonstrated that employing a significant enhancement of the formation of additional defects and intrinsic strains may stretch the crystal lattice of the A1-CoPt phase, resulting in a modification of exchange interaction between Co atoms in the thin-film composition.

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