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Formation of skyrmion states in ion-irradiated CoPt thin films
Kalentyeva I. L.
1, Vikhrova O. V.1, Danilov Yu. A.1, Zdoroveishchev A. V.1, Zdoroveishchev D. A.1, Dorokhin M. V.1, Dudin Yu. A.1, Timiryazeva M. P.2, Timiryazev A. G.2, Sadovnikov A V.3,4, Yunin P. A.5
1Research Institute for Physics and Technology, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
2Fryazino Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia
3Laboratory of Magnetic Metamaterials, Saratov State University, Saratov, Russia
4Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
5Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
2Fryazino Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia
3Laboratory of Magnetic Metamaterials, Saratov State University, Saratov, Russia
4Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
5Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: istery@rambler.ru
The possibilities of controlled exposure to ion irradiation (He+ with an energy of 20 keV and a fluence in the range from 3·1014 to 3·1015 cm-2) as a method for modifying the magnetic properties and domain structure of Co0.35Pt0.65 thin ferromagnetic films have been studied. It was found that the ion irradiation causes a change in the Dzyaloshinskii-Moriya interaction constant and a change in the skyrmion density that correlates with it. This result shows the possibility of homogeneous ion irradiation as a way to control the micromagnetic structure, namely the process of formation of skyrmion states. Keywords: ferromagnetic thin films, ion irradiation, domain structure, magnetic force microscopy, Dzyaloshinskii-Moriya interaction, skyrmions.
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