Dynamical Behavior of Skyrmions On Magnetic Materials Interacting with Anisotropic Defects

• Grant number: 23/17545-1
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• Start date: June 11, 2024
• End date: December 10, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Pablo Antonio Venegas Urenda
• Grantee: José Carlos Bellizotti Souza
• Supervisor: Charles Reichhardt
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
• Institution abroad: Los Alamos National Laboratory, United States
• Associated to the scholarship: 22/14053-8 - Study of Skyrmions Behavior in Magnetic Materials with Defects, BP.MS

Abstract

Skyrmions are magnetic quasiparticles characterized by a topological charge. The magnetic moments composing skyrmion wrapper a the unit sphere, pointing in all directions. The skyrmion motion can be achieved by thermal gradient, magnetic field gradients, spin waves and applied spin polarized current. The applied current density needed to depin skyrmions is between 4 and 5 magnitude orders smaller when compared with the applied current density needed to depin domain walls. Skyrmions exhibits smaller sizes, with the smallest reported size of 0.53nm on Pd/Fe/Ir and are very stable due to their topological protection. The more common material when dealing with magnetic skyrmions is the MnSi, which stabilizes skyrmions with a size of 18nm at low temperatures. These proprieties of skyrmions makes them excellent candidates for spintronic applications, since both the energy cost and the size are smaller when compared to other alternatives, such as domain walls. However, for applying skyrmions on spintronics the skyrmion motion must be precisely controlled. Therefore a good understanding of the skyrmion dynamics interacting with anisotropic defects and materials interfaces, such as deformations, annihilation and nucleation, are essential for technological applications. On this project, using the atomistic model for simulating individual atomic magnetic moments, we investigate the dynamical behavior of different types of skyrmions and other magnetic textures such as merons interacting with anisotropic defects and materials interfaces on the presence of an applied spin polarized current.

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)

SOUZA, J. C. BELLIZOTTI; VIZARIM, N. P.; REICHHARDT, C. J. O.; REICHHARDT, C.; VENEGAS, P. A.. Reversible to irreversible transitions for ac driven skyrmions on periodic substrates. NEW JOURNAL OF PHYSICS, v. 26, n. 11, p. 12-pg., 2024-11-01. (23/17545-1, 21/04655-8)