Abstract:
The effect of ion irradiation on the magnetic properties of films of the ferromagnetic CoPt alloy made by the method of electron beam evaporation is investigated. It has been established that with an increase in the He+ ion fluence from 1 × 1013 to 1 × 1016 cm−2, a decrease in the coercive field and an increase in the planar component of the axis of easy magnetization are observed. Using magnetic force microscopy and Mandel'shtam-Brillouin spectroscopy, it was shown that with certain ion fluence (3 × 1014 cm−2), the formation of isolated round domains representing magnetic skyrmions is observed in the CoPt layer.
Keywords:
electron beam evaporation, ferromagnetic alloy, ion irradiation, isolated round domains.
This work was supported by the project part of state task (no. 8.1751.2017/PCh) of the Ministry of Science and Higher Education of the Russian Federation and by the Russian Foundation for Basic Research (projects nos. 18-29-27026, 18-37-00358_mol_a, 18-57-76001_ERA_a, and 18-29-19137_mk) and also by the Government of the Russian Federation (Agreement no. 074-02-2018-286) for the laboratory of Terahertz Spintronics of the Moscow Institute of Physics and Technology.
Citation:
I. L. Kalentyeva, O. V. Vikhrova, Yu. A. Danilov, M. V. Dorokhin, Yu. A. Dudin, A. V. Zdoroveyshchev, A. V. Kudrin, M. P. Temiryazeva, A. G. Temiryazev, S. A. Nikitov, A. V. Sadovnikov, “Modifying the magnetic properties of the CoPt alloy by ion irradiation”, Fizika Tverdogo Tela, 61:9 (2019), 1694–1699; Phys. Solid State, 61:9 (2019), 1646–1651