Ferromagnetism and Spin-Polarized Luminescence in Lead-Free CsEuCl<sub>3</sub> Perovskite Nanocrystals and Thin Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 35072451.
- Also identified by DOI 10.1021/acsnano.1c09257.
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Abstract
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 CsEuCl<sub>3</sub> perovskite nanocrystals and thin films in the near-UV/visible region, stemming from the <i>f-d</i> transitions centered at the B-site Eu<sup>2+</sup> cations. We show that this material undergoes a ferromagnetic phase transition at ∼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 spin-polarized photoluminescence in the presence of a magnetic field at cryogenic temperatures, saturating with a large polarization ratio (Δ<i>I</i>/<i>I</i> = (<i>I</i><sub>L</sub> - <i>I</i><sub>R</sub>)/(<i>I</i><sub>L</sub> + <i>I</i><sub>R</sub>)) of nearly 30% at modest magnetic fields (∼2 T). These results highlight CsEuCl<sub>3</sub> as an intrinsically ferromagnetic, luminescent metal-halide perovskite with potentially interesting implications for future spin-based technologies using perovskites.