§The growing demand for storage space has promoted in-depth research on magnetic performance regulation in an energy-saving way.Recently,we developed a solar control of magnetism,allowing the magnetic moment to b...§The growing demand for storage space has promoted in-depth research on magnetic performance regulation in an energy-saving 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(J SC)(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 photo-induced electrons doping,and the variation of saturation magnetization(M S)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.展开更多
Flexible electronics/spintronics attracts researchers’attention for their application potential abroad in wearable devices,healthcare,and other areas.Those devices’performance(speed,energy consumption)is highly depe...Flexible electronics/spintronics attracts researchers’attention for their application potential abroad in wearable devices,healthcare,and other areas.Those devices’performance(speed,energy consumption)is highly dependent on manipulating information bits(spin-orientation in flexible spintronics).In this work,we established an organic photovoltaic(OPV)/ZnO/Pt/Co/Pt heterostructure on flexible PET substrates with perpendicular magnetic anisotropy(PMA).Under sunlight illumination,the photoelectrons generated from the OPV layer transfer into the PMA heterostructure,then they reduce the PMA strength by enhancing the interfacial Rashba field accordingly.The coercive field(Hc)reduces from 800 Oe to 500 Oe at its maximum,and the magnetization can be switched up and down reversibly.The stability of sunlight control of magnetization reversal under various bending conditions is also tested for flexible spintronic applications.Lastly,the voltage output of sunlight-driven PMA is achieved in our prototype device,exhibiting an excellent angular dependence and opening a door towards solar-driven flexible spintronics with much lower energy consumption.展开更多
基金the National Key R&D Program of China(Nos.2019YFA0307900 and 2018YFB0407601)the National Natural Science Foundation of China(Nos.91964109,11534015,51802248,11804266,and 62001366)+2 种基金the National 111 Project of China(No.B14040)the Fundamental Research Funds for the Central Universities(No.xjh012019042)the China Postdoctoral Science Foundation(Nos.2018M643636).
文摘§The growing demand for storage space has promoted in-depth research on magnetic performance regulation in an energy-saving 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(J SC)(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 photo-induced electrons doping,and the variation of saturation magnetization(M S)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.
基金The work was supported by the National Key R&D Program of China(Grant No.2022YFB3203903)the National Natural Science Foundation of China(Grant Nos.52172126 and 62001366)the China Postdoctoral Science Foundation(Grant No.2022M722509).
文摘Flexible electronics/spintronics attracts researchers’attention for their application potential abroad in wearable devices,healthcare,and other areas.Those devices’performance(speed,energy consumption)is highly dependent on manipulating information bits(spin-orientation in flexible spintronics).In this work,we established an organic photovoltaic(OPV)/ZnO/Pt/Co/Pt heterostructure on flexible PET substrates with perpendicular magnetic anisotropy(PMA).Under sunlight illumination,the photoelectrons generated from the OPV layer transfer into the PMA heterostructure,then they reduce the PMA strength by enhancing the interfacial Rashba field accordingly.The coercive field(Hc)reduces from 800 Oe to 500 Oe at its maximum,and the magnetization can be switched up and down reversibly.The stability of sunlight control of magnetization reversal under various bending conditions is also tested for flexible spintronic applications.Lastly,the voltage output of sunlight-driven PMA is achieved in our prototype device,exhibiting an excellent angular dependence and opening a door towards solar-driven flexible spintronics with much lower energy consumption.
