Hybrid perfect metamaterial absorber for microwave spin rectification applications.

Autor: Qian J; State Key Laboratory of Surface Physics, Institute of Nanoelectronic Devices and Quantum Computing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai, 200433, China.; Department of Physics and Astronomy, University of Manitoba, Winnipeg, R3T 2N2, Canada., Gou P; State Key Laboratory of Surface Physics, Institute of Nanoelectronic Devices and Quantum Computing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai, 200433, China., Pan H; State Key Laboratory of Surface Physics, Institute of Nanoelectronic Devices and Quantum Computing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai, 200433, China., Zhu L; State Key Laboratory of Surface Physics, Institute of Nanoelectronic Devices and Quantum Computing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai, 200433, China., Gui YS; Department of Physics and Astronomy, University of Manitoba, Winnipeg, R3T 2N2, Canada., Hu CM; Department of Physics and Astronomy, University of Manitoba, Winnipeg, R3T 2N2, Canada., An Z; State Key Laboratory of Surface Physics, Institute of Nanoelectronic Devices and Quantum Computing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai, 200433, China. anzhenghua@fudan.edu.cn.; Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China. anzhenghua@fudan.edu.cn.; Shanghai Qi Zhi Institute, 41th Floor, AI Tower, No. 701 Yunjin Road, Xuhui District, Shanghai, 200232, China. anzhenghua@fudan.edu.cn.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Nov 06; Vol. 10 (1), pp. 19240. Date of Electronic Publication: 2020 Nov 06.
DOI: 10.1038/s41598-020-76090-6
Abstrakt: Metamaterials provide compelling capabilities to manipulate electromagnetic waves beyond the natural materials and can dramatically enhance both their electric and magnetic fields. The enhanced magnetic fields, however, are far less utilized than the electric counterparts, despite their great potential in spintronics. In this work, we propose and experimentally demonstrate a hybrid perfect metamaterial absorbers which combine the artificial metal/insulator/metal (MIM) metamaterial with the natural ferromagnetic material permalloy (Py) and realize remarkably larger spin rectification effect. Magnetic hot spot of the MIM metamaterial improves considerably electromagnetic coupling with spins in the embedded Py stripes. With the whole hybridized structure being optimized based on coupled-mode theory, perfect absorption condition is approached and an approximately 190-fold enhancement of spin-rectifying photovoltage is experimentally demonstrated at the ferromagnetic resonance at 7.1 GHz. Our work provides an innovative solution to harvest microwave energy for spintronic applications, and opens the door to hybridized magnetism from artificial and natural magnetic materials for emergent applications such as efficient optospintronics, magnonic metamaterials and wireless energy transfer.
Databáze: MEDLINE
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