Optical and magneto-optical properties in Fe-doped glasses irradiated with femtosecond laser
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Optical, magnetic, and magneto-optical properties have been investigated for the α-Fe2O3-doped transparent glasses irradiated with an infrared fs laser and subsequently annealed. The values of the saturation magnetization at room temperature for the irradiated glasses were increased compared with the as-prepared samples, which is due to the precipitation of the ferrimagnetic ferrite nanoparticles (NPs). By adding further dopants as precursors of plasmonic metals, Au or Al NPs were space-selectively precipitated together with the ferrite NPs in a confined region after irradiation and thermal annealing. In the case of the glass codoped with Al, magneto-optical Faraday effect was plasmonically enhanced and exhibited a negative distinct peak ascribed to a coupling between the ferrimagnetism of ferrite NPs and the localized surface plasmon resonance of Al NPs, while the glass, in which ferrite and Au NPs were precipitated, showed a positive enhancement of Faraday effect due to a coupling of plasmon resonance with diamagnetism of glass matrix.
KeywordsHAuCl4 Localize Surface Plasmon Resonance Nonbridging Oxygen Localize Surface Plasmon Resonance Peak Faraday Rotation Angle
This work was financially supported by a Grant-in-Aid for Young Scientist (B, No. 20860095) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan, and by the Research Foundation for Opto-Science and Technology, and by the Nippon Sheet Glass Foundation for Materials Science and Engineering, and by the Asahi Glass Foundation.