【摘 要】
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Interactions between light and magnetic matter attracted great attention lately due to their potential applications in nanophotonics,spintronics,and high-accura
【机 构】
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State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Scienc
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Interactions between light and magnetic matter attracted great attention lately due to their potential applications in nanophotonics,spintronics,and high-accuracy sensing.Here,we grew bismuth quantum dots (Bi-QDs) with strong spin-orbit coupling on a magnetic insulator yttrium iron garnet (YIG) via molecular beam epitaxy.The YIG/Bi-QDs material shows an enhanced magneto-optical Kerr rotation up to 130％ compared with that of a bare YIG film.The Bi-QDs were also introduced onto a lutetium-bismuth co-doped YIG film to form a hybrid system with remarkably enhanced Kerr rotation (from 1626 to 2341 mdeg).Ferromagnetic resonance measurements showed an increased effective magnetization as well as interfacial spin-orbit field in the YIG/Bi-QD heterostructures.Localized plasmons were mapped using electron energy loss spectroscopy with high spatial resolution,revealing enhanced plasmon intensity at both the Bi-QD surface and YIG/Bi-QD interface.Introducing Bi-QDs onto the YIG film enhanced Kerr rotation owing to the attenuated optical reflection and increased effective magnetization.The Bi-QD-enhanced magneto-optical effect enables development of efficient nanoscale light switching,spintronics,and even plasmonic nano-antennas.
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