![]() However, thus far, few 2D vdW magnets have been revealed luminescence and exciton behaviors, and none examining magnetic coding of photoluminescence (PL), despite the discovery of luminescence in FM CrI 3 and AFM NiPS 3 ( Hwangbo et al., 2021 Kang et al., 2020 Seyler et al., 2017 Wang et al., 2021). Alternatively, air-stable metallic 2D vdW CrTe 2 and CrSe 2 with thickness-dependent magnetic orders have been directly synthesized by chemical vapor deposition (CVD) methods ( Li et al., 2021 Meng et al., 2021). FM Cr 2Ge 2Te 6 few-layer have demonstrated a p-type semiconducting behavior and gate-controllable magnetism ( Jiang et al., 2018a Verzhbitskiy et al., 2020) few-layer Fe 3GeTe 2 FM metal have shown high Curie temperature ( Tc) above room temperature through ionic/protonic gating, patterning, and interfacial exchange coupling ( Deng et al., 2018 Li et al., 2018 May et al., 2019 Wang et al., 2020a) magnetic topological insulator MnBi 2Te 4 has recently been reported to present layer-dependent magnetic phase and spin-flop behaviors ( Deng et al., 2020 Yang et al., 2021). To date, diverse 2D vdW FM and AFM metal, insulators, and even semiconductors have been explored ( Liu et al., 2021). 2D vdW bilayer CrI 3 FM insulators used as spin valve in a magnetic tunneling junction device have highlighted flexibilities for encoding information and data storage ( Jiang et al., 2018a Klein et al., 2018 Song et al., 2018). The magnetic orders can be switched between FM and atomic force microscope (AFM) states by magnetic field ( Klein et al., 2018 Zhong et al., 2017), electric gating ( Huang et al., 2018 Jiang et al., 2018a, 2018b Zhang et al., 2020), electrostatic doping ( Jiang et al., 2018a Zheng et al., 2020), and hydrostatic pressure ( Li et al., 2019 Song et al., 2019), which empower a pivotal foundation for realizing magnetic and electric control of magneto-optical coupling for information transfer. The emergence of long-range ferromagnetic orders in two-dimensional (2D) van der Waals (vdW) ferromagnetic (FM) material has provided a new avenue for creating on-chip lasers, isolators, and modulators for silicon photonics toward information processing and transmission through magneto-exciton coupling ( Deng et al., 2018 Gong et al., 2017 Huang et al., 2017 Liu et al., 2020, 2021 Mak et al., 2019 Song et al., 2018 Sun et al., 2019). This work enables numerous opportunities for creating magnetic encoding lasing for photonic integrated chips. Reversible magnetic coding of helical luminescence is realized in the range of 950–1100 nm. ![]() ![]() The resonant whispering-gallery modes (WGM) of SiO 2 microspheres cause strong oscillation helical emissions with a full width at half-maximum (FWHM) of ∼5 nm under continuous wave excitation. ![]() Here, we report a straightforward approach to realize strong coupling of narrow helical emission and FM orders in CrI 3 through microsphere cavity. However, 2D vdW ferromagnets explored so far have rarely possessed exciton behaviors to date, FM CrI 3 have been revealed to show ligand-field photoluminescence correlated with FM ordering, but typically with a broad emission peak. Two-dimensional (2D) van der Waals (vdW) ferromagnets have opened new avenues for manipulating spin at the limits of single or few atomic layers, and for creating unique magneto-exciton devices through the coupling of ferromagnetic (FM) orders and excitons.
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