Abstract
Magneto-optical Faraday effect is widely applied in optical devices and is indispensable for optical communications and advanced information technology. However, the bismuth garnet Bi-YIG is only the Faraday material since 1972. Here we introduce (Fe, FeCo)-(Al-,Y-fluoride) nanogranular films exhibiting giant Faraday effect, 40 times larger than Bi-YIG. These films have a nanocomposite structure, in which nanometer-sized Fe, FeCo ferromagnetic granules are dispersed in a Al,Y-fluoride matrix.
Highlights
Optical isolators utilizing Faraday rotation are of importance in many applications, such as quality assurance of optical amplifiers[1], optical ring lasers[2], and optical communication systems[3,4,5]
We analyzed the mechanism of the giant Faraday angle in nanogranular films
The surface/interface produces a main contribution to physical properties, where the orbital magnetic moments of 3d electrons are enhanced[31]
Summary
Optical isolators utilizing Faraday rotation are of importance in many applications, such as quality assurance of optical amplifiers[1], optical ring lasers[2], and optical communication systems[3,4,5]. We introduce (Fe, FeCo)-(Al-, Y-fluoride) nanogranular films exhibiting Faraday rotation 40 times larger than that of Bi-YIG at the wavelength of optical communication band (1500 nm). Nanogranular materials consisting of nanometer-sized magnetic metal granules and a ceramic insulating matrix exhibit various functional properties depending on the composition ratio of the two elements, granules and matrix[12,13,14,15]. Since they are fabricated and are thermally stable, they have significant practical advantages. Magnetization exceeds 18 kA/m (0.023 T) at room temperature
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