Sunlight-induced tri-state spin memory in photovoltaic/ferromagnetic heterostructure

Manipulations of Spin Waves by Photoelectrons in Ferromagnetic/Non‐Ferromagnetic Alloyed Film

“…According to the reported works, changes in the magnetic anisotropy and magnetization in the ferromagnetic layer originating from photoinduced electron doping can be quantified by in situ measurements of ESR and VSM. [35][36][37][38] The M-H loops of Co 60 Al 40 (2 nm)/PTB7-Th:PC 71 BM/Pt are illustrated in Figure 3a, where a decrease of 13.4% of M s in Co 60 Al 40 is obtained under sunlight irradiation. Figure 3b shows a zoom-in view around the coercive field (H c ), which drops from 24 to 20 Oe.…”

“…In this regard, inspired by the achievements of sunlight control over magnetism of ferromagnetic (FM) materials, [35][36][37][38] we obtained CoAl alloy thin films by the co-sputtering method and prepared a prototype photovoltaic tunable spin-wave device based on the Pt/PTB7-Th:PC 71 BM/Co 60 Al 40 /Ta/Si heterojunction, where PTB7-Th:PC 71 BM is used as the photovoltaic layer (PV) to produce photoelectrons. [39,40] We investigated the spindynamics behavior of the Co 60 Al 40 alloy through the angle dependence of the zero-order ferromagnetic resonance (FMR) spectrum.…”

Perspectives: Light Control of Magnetism and Device Development

“…Their work provided a theoretical basis for developing environmentally friendly and energy-efficient solar-driven spintronics devices . The effect of sunlight irradiation on the control of interfacial magnetism by inserting different intermediate layers (Cu and Ta) into the photovoltaic/ferromagnetic heterostructures was found by Zhao et al, as shown schematically in Figure c . Introducing the intermediate Cu layer between the ferromagnetic and photovoltaic layers resulted in reversible tuning of the saturation magnetization strength and enhanced tunability, which illustrate the excellent reversibility of Cu insertion into the heterostructure.…”

“…210 The effect of sunlight irradiation on 10c. 211 Introducing the intermediate Cu layer between the ferromagnetic and photovoltaic layers resulted in reversible tuning of the saturation magnetization strength and enhanced tunability, which illustrate the excellent reversibility of Cu insertion into the heterostructure. As can be seen from Figure 10d, sunlightcontrolled magnetic bistability switching can be achieved in Cu-inserted heterostructures.…”

“…(e) Electron migration and cyclic characteristic diagrams of magnetic field and time in light control of Ta-inserted heterostructure in the four states. Reprinted with permission from ref . Copyright 2022, Elsevier Ltd. All rights reserved.…”