Plasmon-enhanced Brillouin light scattering spectroscopy for magnetic systems: Theoretical model

Autor(en)

Valeri Lozovski, Andrii V. Chumak

Abstrakt

Brillouin light scattering (BLS) spectroscopy is an effective method for detecting spin waves in magnetic thin films and nanostructures. While it provides extensive insight into the properties of spin waves, BLS spectroscopy is impeded in many practical cases by the limited range of detectable spin wave wavenumbers and its low sensitivity. Here, we present a generalized theoretical model describing plasmon-enhanced BLS spectroscopy. Three types of plasmonic nanoparticles in the shape of an ellipsoid of rotation are considered: a single plasmon resonator, a sandwiched plasmonic structure in which two nanoparticles are separated by a dielectric spacer, and an ensemble of metallic nanoparticles on the surface of a magnetic film. The effective susceptibilities for the plasmonic systems at the surface of the magnetic film are calculated using the electrodynamic Green functions method, and the enhancement coefficient is defined. It is analytically shown that the ratio of the plasmon resonator height to its radius plays the key role in the development of plasmon-enhanced BLS spectroscopy. The developed model serves as a basis for numerical engineering of the optimized plasmon nanoparticle morphology for BLS enhancement.

Organisation(en)

Nanomagnetismus und Magnonik, Forschungsplattform Internationales Erwin Schrödinger Institut für Mathematik und Physik

Externe Organisation(en)

Taras Shevchenko National University of Kyiv (KNU), Erwin Schrödinger Institut

Journal

Physical Review B

Band

110

Anzahl der Seiten

12

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.110.184419

Publikationsdatum

11-2024

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ea410b73-1796-49a5-9be3-0155c3127c68