Effect of Ion Irradiation on the Magnetic Properties of CoPt Films

The possibility of using implantation of 20-keV He + ions for modification of the domain structure and magnetic properties of CoPt films (formed by the electron-beam evaporation method) with different cobalt contents (Co 0.45 Pt 0.55 and Co 0.35 Pt 0.65 ) has been investigated. A decrease in the coe...

Full description

Saved in:
Bibliographic Details
Published in:Physics of the solid state 2021-03, Vol.63 (3), p.386-394
Main Authors: Kalentyeva, I. L., Vikhrova, O. V., Danilov, Yu. A., Zdoroveyshchev, A. V., Dorokhin, M. V., Dudin, Yu. A., Kudrin, A. V., Temiryazeva, M. P., Temiryazev, A. G., Nikitov, S. A., Sadovnikov, A. V.
Format: Article
Language:English
Subjects:
Alloys
Cobalt
Cobalt base alloys
Cobalt compounds
Coercivity
Domain walls
Electron beams
Fluence
Hypothetical particles
Hysteresis loops
Intermetallic compounds
Ion implantation
Ion irradiation
Magnetic fields
Magnetic properties
Magnetic saturation
Magnetism
Magnetization
Metals
Particle theory
Physics
Physics and Astronomy
Platinum compounds
Reinforced reaction injection molding
Solid State Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The possibility of using implantation of 20-keV He + ions for modification of the domain structure and magnetic properties of CoPt films (formed by the electron-beam evaporation method) with different cobalt contents (Co 0.45 Pt 0.55 and Co 0.35 Pt 0.65 ) has been investigated. A decrease in the coercive field (narrowing of the hysteresis loop in the magnetic-field dependences of the Faraday angle and magnetization) with an increase in the He + ion fluence from 2 × 10 14 to 4 × 10 14 cm –2 has been found for the irradiated CoPt samples of both compositions. The residual magnetization of the Co 0.35 Pt 0.65 films coincides with the saturation magnetization, and a decrease in the residual magnetization is observed for Co 0.45 Pt 0.55 . It is shown by magnetic force microscopy that the largest number of round isolated domains (skyrmions) for the Co 0.45 Pt 0.55 alloy are formed when the ion fluence increases to 3 × 10 14 cm –2 , while 360-degree domain walls (1D skyrmions) are observed along with round isolated domains for the Co 0.35 Pt 0.65 films irradiated with a He + fluence of 4 × 10 14 cm –2 . An analysis of CoPt films by Mandelstam–Brillouin spectroscopy revealed an increase in the shift between the Stokes and anti-Stokes components of the spectrum and a significant enhancement of the Dzyaloshinski–Moriya interaction in the irradiated samples. Model calculations performed using the SRIM program showed that the ion irradiation facilitates asymmetric mixing of Co and Pt atoms in CoPt films, which may underlie the mechanism of the observed effects of ion irradiation on their magnetic properties and domain structure.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783421030082