Electrical manipulation of spins is essential to design state-of-the-art spintronic devices and commonly relies on the spin current injected from a second heavy-metal material. The fact that chiral antiferromagnets produce spin current inspires us to explore the magnetization switching of chiral spins using self-generated spin torque. Here, we demonstrate the electric switching of noncollinear antiferromagnetic state in Mn3Sn by observing a crossover from conventional spin-orbit torque to the self-generated spin torque when increasing the MgO thickness in Ta/MgO/Mn3Sn polycrystalline films. The spin current injection from the Ta layer can be controlled and even blocked by varying the MgO thickness, but the switching sustains even at a large MgO thickness. Furthermore, the switching polarity reverses when the MgO thickness exceeds around 3 nm, which cannot be explained by the spin-orbit torque scenario due to spin current injection from the Ta layer. Evident current-induced switching is also observed in MgO/Mn3Sn and Ti/Mn3Sn bilayers, where external injection of spin Hall current to Mn3Sn is negligible. The inter-grain spin-transfer torque induced by spin-polarized current explains the experimental observations. Our findings provide an alternative pathway for electrical manipulation of non-collinear antiferromagnetic state without resorting to the conventional bilayer structure.
Inorganic perovskites have attracted intensive research attention. The perovskites ABX3 (X = Cl, Br, and I) can be used for blue, green, and red emission by adjusting the halogen X. However, it is very hard to avoid halogen exchanging when different halide perovskites are used together for optoelectronic devices. We synthesized the all-bromide inorganic perovskite nanocrystals with full color emission. The blue emission with a center wavelength of 405 nm originates from the exciton recombination through the charge-transfer exciton state in perovskite Cs4PbBr6. The green emission with a center wavelength of 520 nm results from band edge-exciton recombination in perovskite CsPbBr3. The red emission with a center wavelength of 606 nm comes from the trapped- and self-trapped-exciton recombination in perovskite CsPb2Br5. Our experimental results show that all-bromide inorganic perovskite nanocrystals have great potential for full color light emitting devices.
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