Ferromagnetism and Spin-Polarized Luminescence in Lead-Free CsEuCl3 Perovskite Nanocrystals and Thin Films

The emergence of next-generation spintronic and spin-photonic technologies will be aided by the development of materials showing strongly coupled magnetic, electronic, and optical properties. Through a combination of magneto-photoluminescence and magnetic circular dichroism spectroscopies we demonstrate strong magneto-optical responses from CsEuCl3 perovskite nanocrystals and thin films in the near-UV/visible region, stemming from the f-d transitions centered at the B-site Eu2+ cations. We show that this material undergoes a ferromagnetic phase transition at similar to 3 K in both the nanocrystal and thin-film samples, resulting in complete spin alignment and indicating intrinsic ferromagnetism. We also report the observation of spinpolarized photoluminescence in the presence of a magnetic field at cryogenic temperatures, saturating with a large polarization ratio (Delta I/I = (I-L - I-R)/(I-L + I-R)) of nearly 30% at modest magnetic fields (similar to 2 T). These results highlight CsEuCl3 as an intrinsically ferromagnetic, luminescent metal-halide perovskite with potentially interesting implications for future spinbased technologies using perovskites.