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Room Temperature Spin-Phonon Coupling in Cr_2O_3 Nanocrystals

机译：Room Temperature Spin-Phonon Coupling in Cr_2O_3 Nanocrystals

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摘要

In this study, nanocrystals of antiferromagnetic Cr_2O_3 are shown via Ramanspectroscopy to display peculiar lattice dynamics in terms of phononsoftening and the occurrence of an exceptionally strong spin-phononcoupling. This effect, which is observed to persist well above the onset of theantiferromagnetic ordering temperature, is ascribed to locally correlated spinfluctuations due to the modulation of the magnetic exchange interactionsas the chromium atoms oscillate about their equilibrium position. It isfound that the spin-phonon coupling strength is governed by the competingantiferromagnetic and ferromagnetic interactions, where changes in thesurface spin configuration can also play a crucial role. Overall, this workproves the size dependence of the interplay between the crystalline andmagnetic structures in 3D antiferromagnets varying the surface-to-volumeratio and helps establish the fundamentals for a spin-phonon couplingengineering at the nanoscale via a simple route in a very stable and easyto synthesize material. More importantly, it demonstrates the possibility ofcoupling phononic excitations with the magnetization dynamics at roomtemperature, offering a highly prospective nanomaterial for the design ofnovel magnonic devices.

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