Dynamic behavior of Skyrmions in infinite Chiral Films in the presence of periodic Pinning potentials at zero temperature

• Grant number: 21/04941-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): August 01, 2021
• Effective date (End): December 31, 2022
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Pablo Antonio Venegas Urenda
• Grantee: José Carlos Bellizotti Souza
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

In this work, we will study the dynamic behavior of skyrmions on chiral magnets, in the presence of periodic pinning potentials. In particular, we will analyze pinning centers with funnel-type geometry. Initially proposed by the English physicist Tony Skyrme, skyrmions are quasi-particles that correspond to a distribution of spins pointing in all directions under a sphere and are present in ferromagnetic materials, liquid crystals, Bose-Einstein condensates, and others. Its formation is primarily due to two competing interactions: the ferromagnetic exchange interaction and the Dzyaloshinskii-Moriya interaction. More recently, magnetic skyrmions have also been found on chiral magnets. Skyrmions have different physical properties, but they have some characteristics in common with vortices in superconductors, both minimize their repulsive interactions forming a regular triangular network, stabilize in equilibrium positions in the presence of trapping centers and go into motion when subjected to a transport current, and show critical currents and commensurability effects. The ability of skyrmions to start moving at low current values of polarized spins is remarkable, this means that they can be manipulated with a low energy cost. This makes them excellent candidates for applications in spintronics. A good understanding of the dynamics of skyrmions and the control of their movement is essential for future technological applications. In the present project, using Molecular Dynamics techniques, we will simulate the dynamic behavior of skyrmions in a two-dimensional chiral magnet, under the influence of a periodic distribution of trapping centers with funnel-like geometry and zero temperature, subjected to an external current. We will calculate for various values of the density of obstacles as well as the Magnus force and damping. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

VIZARIM, N. P.; SOUZA, J. C. BELLIZOTTI; REICHHARDT, C. J. O.; REICHHARDT, C.; MILOSEVIC, M. V.; VENEGAS, P. A.. Soliton motion in skyrmion chains: Stabilization and guidance by nanoengineered pinning. PHYSICAL REVIEW B, v. 105, n. 22, p. 12-pg., 2022-06-16. (21/04941-0, 17/20976-3)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Magnus induced diode effect for skyrmions in channels with periodic potentials. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 35, n. 1, p. 10-pg., 2023-01-11. (17/20976-3, 21/04941-0)

BELLIZOTTI SOUZA, J. C.; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Clogging, diode and collective effects of skyrmions in funnel geometries. NEW JOURNAL OF PHYSICS, v. 24, n. 10, p. 14-pg., 2022-10-01. (21/04941-0, 17/20976-3)