English Post:
Researchers have been working on fabricating thin films of 2D layered organic–inorganic hybrid perovskites (2D-OIHPs) for spintronic applications using solution-based processes like the Langmuir–Blodgett technique. Despite numerous 2D Ruddlesden–Popper (RP) OIHPs being known as quasi-2D Heisenberg magnets in bulk form, monolayer or few-layered 2D magnets have not been realized. Now, chemical exfoliation using solvent engineering has successfully synthesized large-sized, few unit-cell-thick 2D RP-OIHPs. Structural characterization indicates that binary co-solvents with high relative polarity in the spin coating technique are most effective. This method produces few-layered 2D RP-OIHP ultrathin films that maintain intrinsic magnetic order. Notably, ferromagnetism driven by the Jahn–Teller effect remains robust in seven-layered (C6H5CH2CH2NH3)2CuCl4 ultrathin films, while Ising-like dipolar anisotropy in ten-layered (C6H5CH2CH2NH3)2MnCl4 is greatly reduced. This approach opens new possibilities for creating 2D RP-OIHP van der Waals magnets for energy-efficient spintronic and opto-spintronic devices. -Science Journal cover design by scapiens
