Near-field mechanism of the enhanced broadband magneto-optical activity of hybrid Au loaded Bi:YIG

Abstract

We unravel the underlying near-field mechanism of the enhancement of the magneto-optical activity of bismuth-substituted yttrium iron garnet films (Bi:YIG) loaded with gold nanoparticles.

Dielectric and gyromagnetic structure modulations of Zn–Sn codoped yttrium–iron–garnet based on the density‐generalized functional theory and P–V–L bond theory

“…Yttrium iron garnet (YIG) microwave ferrites are widely used in microwave communication systems, for example, microwave circulators and spintronic devices, [1][2][3][4] owing to their microwave properties such as relatively lowsaturation magnetization strength, low dielectric loss, and narrow ferromagnetic resonance (FMR) linewidth at GHz frequencies. [5][6][7][8][9] High-speed broadband networks and satellite communication systems impose challenges to the performance requirements of microwave ferrites.…”

Dielectric Effects in FeOx-Coated Au Nanoparticles Boost the Magnetoplasmonic Response: Implications for Active Plasmonic Devices

“…Among the approaches reported, the exploitation of robust and reproducible electron beam lithography allowed the fabrication of nanomaterials with improved magnetoplasmonic features, for instance, using a magnetic metal able to sustain a plasmonic resonance (such as Ni nanowires or nanodisks ,, ) or by designing appropriate hybrid magnetoplasmonic nanoheterostructures, in which noble metals are directly combined with magnetic metals , or metal alloys − at the nanoscale. Improved magnetoplasmonic performance was also achieved by embedding Au nanostructures in a magneto-optically active Bi:YIG film . An alternative to physical methods, chemical synthesis is a valuable and complementary tool as it can produce higher amounts of hybrid nanoheterostructures with good control over size, shape, and composition, which are readily dispersible in transparent solvents or polymeric matrices. − However, only a few examples of hybrid nanostructures with promising magnetoplasmonic properties have been reported through these approaches. − Moreover, the investigation was almost exclusively focused on the effect of LSPR on the MO activity of the magnetic counterpart, rather than on the possible role of the latter in the magnetic modulation of the LSPR in the noble metal domain.…”

“…Improved magnetoplasmonic performance was also achieved by embedding Au nanostructures in a magneto-optically active Bi:YIG film. 29 An alternative to physical methods, chemical synthesis is a valuable and complementary tool as it can produce higher amounts of hybrid nanoheterostructures with good control over size, shape, and composition, which are readily dispersible in transparent solvents or polymeric matrices. 30−35 However, only a few examples of hybrid nanostructures with promising magnetoplasmonic properties have been reported through these approaches.…”

Magnetoplasmonics beyond Metals: Ultrahigh Sensing Performance in Transparent Conductive Oxide Nanocrystals

“…For the design of efficient active magnetoplasmonic elements, two key factors come into play: the magnitude of the magnetic modulation and the quality of the optical resonance. Using magneto-optical spectroscopic techniques, magnetically driven modulation of localized surface plasmon resonance (LSPR) has been observed on different combinations of materials: pure noble metals, − dielectric-metallic hyperbolic nanoparticles, ferromagnetic Ni nanodisks, , hybrid noble metal/magnetic nanostructures, − and Au nanostructures embedded in transparent magnetic insulators. − Nevertheless, achieving strong magnetic modulation without degrading the plasmonic properties remains challenging, and real life applications are hampered by the magnetoplasmonic trilemma: (1) a good plasmonic metal has sharp optical resonances but low magneto-optical response; , (2) a magnetic metal has strong magnetoplasmonic response but a very broad plasmonic resonance; , (3) mixing the two components degrades the quality of both features. , The trilemma seems to set fundamental limitations to the development of high-performance magnetoplasmonic platforms, since an improvement in any parameter inevitably results in the deterioration of other parameters. These considerations, however, hold only for standard metals: a paradigm shift in material choice that goes beyond standard metallic plasmonic materials can indeed remove the limitations imposed by the trilemma.…”