Vortex dynamics in finite mesoscopic superconductors under ac-magnetic fields
Danielly Brito, Talles Benites, Rodolfo Izquierdo, Rafael Zadorosny
São Paulo State University (UNESP), School of engineering, Campus Ilha Solteira – SP (Brazil) - Physics and Chemistry Department.
Abstract:
This work investigates vortex dynamics in a thin superconducting sample subjected to alternating magnetic fields [1]. A square-shaped geometry containing a regular array of square antidots was simulated using the generalized time-dependent Ginzburg-Landau (GTDGL) equations, implemented in Fortran 90 [2]. The system was subjected to a static magnetic field superimposed with an alternating one, both applied perpendicular to the sample surface. The results show that, at low field amplitudes, the material exhibits reduced energy dissipation. However, as the magnetic field approaches the upper critical field, the hysteresis pattern becomes more pronounced, increasing the energy dissipation due to the large number of vortices penetrating and exiting the system. These findings are crucial for understanding the vortex dynamics in superconducting devices operating in environments embedded in alternating signals, such as electric machines [3].
Acknowledgements:
CNPq. grant 310428/2021-1, and CAPES, financial code 001.
References:
[1] A. D. Hernández and D. Domínguez, Physical Review B vol. 66, page 144505 (2002).
[2] R. C. Santos, et al., Physics Letters A vol. 458, page 128595 (2023).
[3] H. Zhang et al., Energies vol. 14, page 2234 (2021).
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