Work

Geometry-driven control of magnetic states and spin-wave modes in bridged magnetic dots

Year: 2025

Type: article

Abstract: Through micromagnetic simulations, we have investigated the influence of bridge geometry—specifically the modulation parameter λ -on the static and dynamic magnetic properties of bridged dot nanostructures. Our analysis revealed two distinct magnetic evolution paths: one leading to metastable vortex and antivortex configurations, and another converging to quasi-uniform ferromagnetic states. The dynamic susceptibility spectra show that each magnetic path supports a characteristic set of spin-wave resonance modes, with frequencies and spatial profiles that vary systematically with λ . We demonstrate that by tuning this geometric parameter, it is possible to achieve precise control over the number, frequency, and spatial localization of spin-wave modes. These findings provide a foundation for designing reconfigurable magnonic devices and open new avenues for the development of geometry-engineered spintronic and signal-processing applications.

Source: Physica Scripta

DOI: 10.1088/1402-4896/ae1074

Authors: Eduardo Saavedra, Ulises Guevara, Tamara González-Vega, Pablo Díaz, David Laroze

Institutions: Universidad de Santiago de Chile, University of La Serena, Viña del Mar University, Universidad de La Frontera, University of Tarapacá

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Santiago de Chile, Fondo Nacional de Desarrollo Científico y Tecnológico

Awards: G8054144353, G8748522087