Study of spin wave propagation in a microwave guide based on a YIG film with magnetite nanoparticles

Abstract

Recent advancements in magnonics, a novel branch of spintronics, focus on utilizing ferrite-garnets for information transfer through spin waves (SW) rather than relying on the transport properties of spin-polarized electrons. This approach enables the development of functional signal processing blocks based on magnonic principles. Concurrently, there is growing interest in the application of magnetic materials in biomedicine. Magnetic nanoparticles are particularly valuable due to their unique properties, such as high adsorption capacity and the ability to be remotely controlled. These nanoparticles are used not only in diagnostics, where they enhance MRI contrast, but also in targeted drug delivery.

Iron Yttrium Garnet (YIG) films, known for their exceptionally low spin wave damping even at nanometer thicknesses, are a key material for creating magnetic waveguiding structures. This study investigates a YIG film with an array of magnetite nanoparticles on its surface. Micromagnetic simulations were conducted using the MuMax3 software package, where the structure was divided into a grid at the nodes of which Landau-Lifshitz equation with Gilbert damping was numerically solved. in the simulations created conditions for the excitation of a surface magnetostatic wave, with an external magnetic field applied along the positive or negative Oy direction. The magnitude of the external magnetic field was set to 1200 Oe.

The findings from this study contribute to the understanding of dynamics of spin wave propagation in YIG-based magnonic devices with magnetite nanoparticles, providing insights that are crucial for the future development of both magnonic technologies and biomedical applications involving magnetic nanoparticles.

Speaker

Fedor E. Garanin
Saratov State University
Russia

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