Study of Skyrmions Behavior in Magnetic Materials with Defects

• Grant number: 22/14053-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: June 01, 2023
• End date: August 31, 2025
• 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
• Associated scholarship(s): 23/17545-1 - Dynamical Behavior of Skyrmions On Magnetic Materials Interacting with Anisotropic Defects, BE.EP.MS

Abstract

In this work we will study the dynamical behavior of skyrmions on the presence of different defects configurations.Proposed initially by the english physicist Tony Skyrme, skyrmions are quasi-particles corresponding to a spin distribution pointing in all directions wrapping a sphere. It formation is primordially by two concurrent interactions: the ferromagnetic exchange and the Dzyaloshinskii-Moriya interaction. More recently, skyrmion have been found in magnetic materials. Skyrmions are set to motion by applying a spin polarized current, and the current density needed for starting its motion is 4 to 5 orders of magnitude smaller when compared to the current density necessary to move Bloch walls. Furthermore, skyrmions shows smaller sizes, on the order of some nanometers in MnSi at low temperatures. This makes skyrmions excellent for applications on spintronics, since there is a low energy cost and potential for higher density associate with it.A good understanding of skyrmion dynamics on the presence of different defects configurations, as well as deformations, annihilation and creation of skyrmions, are essential for future technological applications. On the present project, using the atomistic model, we will simulate the skyrmion behavior interacting with defects applying a spin polarized current.

Scientific publications

(5)

(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)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Controlled skyrmion ratchet in linear protrusion defects. PHYSICAL REVIEW B, v. 109, n. 5, p. 12-pg., 2024-02-07. (22/14053-8, 21/04655-8)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Soliton motion induced along ferromagnetic skyrmion chains in chiral thin nanotracks. Journal of Magnetism and Magnetic Materials, v. 587, p. 9-pg., 2023-09-25. (17/20976-3, 22/14053-8)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Shapiro steps and stability of skyrmions interacting with alternating anisotropy under the influence of ac and dc drives. PHYSICAL REVIEW B, v. 110, n. 1, p. 13-pg., 2024-07-03. (22/14053-8, 21/04655-8)

ROCHA, F. S.; SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Skyrmion transport and annihilation in funnel geometries. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 36, n. 11, p. 12-pg., 2024-03-20. (17/20976-3, 22/14053-8, 21/04655-8)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Skyrmionium dynamics and stability on one dimensional anisotropy patterns. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 37, n. 19, p. 7-pg., 2025-05-12. (22/14053-8, 23/17545-1, 24/02941-1, 24/13248-5)