Abstract
Light–Matter strong coupling in the vacuum limit has been shown, over the past decade, to enhance material properties. Oxide nanoparticles are known to exhibit weak ferromagnetism due to vacancies in the lattice. Here we report the 700-fold enhancement of the ferromagnetism of YBa2Cu3O7–x nanoparticles under a cooperative strong coupling at room temperature. The magnetic moment reaches 0.90 μB/mol, and with such a high value, it competes with YBa2Cu3O7–x superconductivity at low temperatures. This strong ferromagnetism at room temperature suggest that strong coupling is a new tool for the development of next-generation magnetic and spintronic nanodevices.
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