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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
Effective date (Start): June 11, 2024
Effective date (End): 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
Research place: 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.

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