Spin waves in artificial spin ice formed by ferro- and antiferromagnets: a new magnonic crystal representative

• Grant number: 19/23317-6
• Support type: Scholarships in Brazil - Doctorate (Direct)
• Effective date (Start): November 01, 2020
• Effective date (End): July 31, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal researcher: Kleber Roberto Pirota
• Grantee: Breno Malvezzi Cecchi
• Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 17/10581-1 - Emergent phenomena in reduced dimension systems, AP.TEM

Abstract

Magnonic crystals are periodically micro- or nanostructured metamaterials in order to manipulate and control the propagation of spin waves. They have attracted great interest from the Fundamental Physics point of view at the same time that are great promising of technological application at the area of magnonics. The purpose of this project is investigate the performance of systems known as artificial spin ice as magnonic crystals. These systems are formed by nanomagnets (ferromagnets), called islands, whose periodic lattice geometry prevents that each interacting pair minimize its energy simultaneously, an effect called geometric frustration. They have been extensively studied at the past decade due to the rich phenomenology originated by this frustration, such as ground state highly degenerate, magnetic monopoles emergence and 1D spin avalanches in a 2D system. All these phenomena are quasi-static, making this project one of the pioneers upon the study of dynamical excitations in artificial spin ice. However, the understanding of its dynamic is conditioned to the comprehension of its static behavior and, therefore, both regimes will be addressed in the project, but having the first at focus. Another innovative initiative launched is the study of magnonic crystals formed not only by ferromagnets but also by antiferromagnets, something never explored until now. In this sense, the proposal is to take the artificial spin ice design but fabricate islands as being bilayers, one ferro- and the other antiferromagnetic coupled via exchange bias. (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)

VELO, MURILO FERREIRA; PUYDINGER DOS SANTOS, MARCOS VINICIUS; CECCHI, BRENO MALVEZZI; PIROTA, KLEBER ROBERTO. General approach for anisotropic magnetoresistance calculations used for revealing the role of cobalt nanowire?s geometrical details. Journal of Magnetism and Magnetic Materials, v. 532, AUG 15 2021. Web of Science Citations: 0.

VELO, MURILO FERREIRA; CECCHI, BRENO MALVEZZI; PIROTA, KLEBER ROBERTO. Micromagnetic simulations of magnetization reversal in kagome artificial spin ice. Physical Review B, v. 102, n. 22 DEC 17 2020. Web of Science Citations: 0.