The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

Alexander Vakhrushev; Aleksey Fedotov; Olesya Severyukhina; Anatolie Sidorenko

doi:10.3762/bjnano.14.3

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

Beilstein J Nanotechnol. 2023 Jan 4:14:23-33. doi: 10.3762/bjnano.14.3. eCollection 2023.

Authors

Alexander Vakhrushev^{1

2}, Aleksey Fedotov^{1

2

3}, Olesya Severyukhina^{1

2

3}, Anatolie Sidorenko^{2

4}

Affiliations

¹ Modeling and Synthesis of Technological Structures Department, Institute of Mechanics, Udmurt Federal Research Centre, Ural Division, Russian Academy of Sciences, Baramzinoy 34, Izhevsk 426067, Russia.
² Orel State University named after I.S. Turgenev, Komsomolskaya Str. 95, 302026, Orel, Russia.
³ Nanotechnology and Microsystems Department, Kalashnikov Izhevsk State Technical University, Studencheskaya 7, Izhevsk 426069, Russia.
⁴ Institute of Electronic Engineering and Nanotechnologies of Technical University of Moldova, Academiei 3/3, Chisinau 2028, Moldova.

Abstract

The present paper considers a mathematical model describing the time evolution of spin states and magnetic properties of a nanomaterial. We present the results of two variants of nanosystem simulations. In the first variant, cobalt with a structure close to the hexagonal close-packed crystal lattice was considered. In the second case, a cobalt nanofilm formed in the previously obtained numerical experiment of multilayer niobium-cobalt nanocomposite deposition was investigated. The sizes of the systems were the same in both cases. For both simulations, after pre-correction in the initial time stages, the value of spin temperature stabilized and tended to the average value. Also, the change in spin temperature occurred near the average value. The system with a real structure had a variable spin temperature compared to that of a system with an ideal structure. In all cases of calculations for cobalt, the ferromagnetic behavior was preserved. Defects in the structure and local arrangement of the atoms cause a deterioration in the magnetic macroscopic parameters, such as a decrease in the magnetization modulus.

Keywords: LAMMPS; magnetic materials; molecular dynamics; nanocomposites; nanofilms; spintronics.

Grants and funding

The research was supported by the Russian Science Foundation project 20-62-47009, "Physical and Engineering Foundations of Non-Von Neumann Architecture Computers Based on Superconductor Spintronics".