posted on 2020-09-02, 20:44authored byShishun Zhao, Yifan Zhao, Bian Tian, Junxue Liu, Shengye Jin, Zhuangde Jiang, Ziyao Zhou, Ming Liu
The
demand for low-power flexible spintronics for sensing, communicating,
and data processing applications boosts an intense search for novel
ways of controlling magnetism. In this work, a photovoltaic controllable
flexible spintronic device within a Kapton/Ta/Co/(PC71BM/PTB7-Th)/Pt
heterostructure was demonstrated, and the magnetic anisotropy change
of this flexible heterostructure as a function of the external light
radiation and strain was quantitatively determined. 150 mW/cm2 white light illumination induced 489 Oe out-of-plane ferromagnetic
resonance field modulation, which was attributed to the photogenerated
electron doping in the cobalt film. The chemical contamination effect
and the interfacial oxidation effect during the photovoltaic doping
process were eliminated. Moreover, it was found that the working function
of the thin-film electrodes were different from the bulk values via
an ultraviolet photoelectron spectroscopy test. Our results on flexible
photovoltaic spintronics systems will invigorate the research toward
the development of solar-driven energy-efficient spintronics.