Synthesis of yttrium iron garnet/bismuth quantum dot heterostructures with localized plasmon enhanced magneto-optical performance
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第16期
论文作者：Lichuan Jin Caiyun Hong Dainan Zhang Peng Gao Yiheng Rao Gang Wang Qinghui Yang Zhiyong Zhong Huaiwu Zhang
文章页码：32 - 39
摘 要：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–QDenhanced magneto-optical effect enables development of efficient nanoscale light switching, spintronics,and even plasmonic nano-antennas.
Lichuan Jin1，Caiyun Hong2，Dainan Zhang1，Peng Gao3,4，Yiheng Rao1，Gang Wang1，Qinghui Yang1，Zhiyong Zhong1，Huaiwu Zhang1
1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China2. School of Science, Westlake University3. Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University
摘 要：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–QDenhanced magneto-optical effect enables development of efficient nanoscale light switching, spintronics,and even plasmonic nano-antennas.
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