Organic/metal interface–modulated magnetism in [Fe/C₆₀]₃ multilayers and Fe-C₆₀ composites

Abstract

Because of the expected long spin-transport length of organic materials, the magnetic metal/organic interface is crucial to the application of organic spintronics. In this study, [Fe/C 60 ] 3 multilayers were fabricated for the investigation of C 60 -mediated magnetic interlayer coupling. [Fe/C 60 ] 3 thin films were characterized using the magneto-optical Kerr effect, transmission electron microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy (XPS). The thin films revealed in-plane magnetic anisotropy, and the magnetic coercivity (H c ) drastically decreased from 6-8 mT to 0.5 mT with the increase of C 60 thickness from 0.1 nm to 5 nm. The insertion of the C 60 layer considerably reduced H c because a thickness greater than 1 nm of the C 60 layer is sufficient for blocking magnetic exchange coupling between Fe layers. In addition, post-annealing increased H c because of Fe inter-diffusion, which promotes magnetic exchange coupling and further Fe-C bonding, as confirmed by a comparative study of XPS C-spectra. The thermally triggered inter-diffusion between Fe and C 60 layers turned the multilayers into a mixed composite film and thus caused magnetic variation. Annealing time and temperature can be used as control parameters for the tuning of magnetism in Fe-C 60 composites.

Direct Magnetism Modulation of CsPbBr3 Quantum Dots/Cobalt Heterostructures by Laser Illumination for Spintronic Applications

“…The magnetic field is applied parallel to the film surface. To investigate the properties of the CsPbBr 3 /Co interface, in-house depth-profiling X-ray photoemission spectroscopy (XPS) combined with 3 keV Ar + ion sputtering was used to confirm the chemical state of Cs, Pb, Br, and Co at different depths …”