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https://doi.org/10.1007/s12274-021-3841-x

Improving solar control of magnetism in ternary organic photovoltaic system with enhanced photo-induced electrons doping

Yujing Du1,§, Shiping Wang2,§, Lei Wang3 (✉), Shengye Jin2, Yifan Zhao1 (✉), Tai Min3, Zhuangde Jiang4, Ziyao Zhou1, and Ming Liu1

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1 Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China
2 State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
3 Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
4 State Key Laboratory for Manufacturing Systems Engineering, Collaborative Innovation Center of High-End Manufacturing Equipment, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China
§ Yujing Du, and Shiping Wang contributed equally to this work.

Keywords: multiferroic heterostructure, magnetoelectric coupling, ferromagnetic resonance, magnetic anisotropy, interface charge doping
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  • Abstract
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The growing demand for storage space has promoted in-depth research on magnetic performance regulation in an energysaving way. Recently, we developed a solar control of magnetism, allowing the magnetic moment to be manipulated by sunlight instead of the magnetic field, current, or laser. Here, binary and ternary photoactive systems with different photon-to-electron conversions are proposed. The photovoltaic/magnetic heterostructures with a ternary system induce larger magnetic changes due to higher short current density (JSC) (20.92 mA·cm−2) compared with the binary system (11.94 mA·cm−2). During the sunlight illumination, ferromagnetic resonance (FMR) shift increases by 80% (from 169.52 to 305.48 Oe) attributed to enhanced photoinduced electrons doping, and the variation of saturation magnetization (MS) is also amplified by 14% (from 9.9% to 11.3%). Furthermore, photovoltaic performance analysis and the transient absorption (TA) spectra indicate that the current density plays a major role in visible light manipulating magnetism. These findings clarify the laws of sunlight control of magnetism and lay the foundation for the next generation solar-driven magneto-optical memory applications.
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Improving solar control of magnetism in ternary organic photovoltaic system with enhanced photo-induced electrons doping. Nano Res. https://doi.org/10.1007/s12274-021-3841-x

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