Magnetic proximity effects are typically limited to a few nanometers due to the short-range nature of the underlying magnetic interactions. Here, we use off-axis electron holography to reveal an electrostatically induced long-range magnetic proximity effect that extends over a distance of 40 nm at a ferromagnetic/paramagnetic interface in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_3$. We show that this behavior results from carrier diffusion and drift across the interface, which changes the ${\mathrm{Mn}}^{3+}/{\mathrm{Mn}}^{4+}$ ratio and hence the local Curie temperature and density of magnetic moments.

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• Magnetism
• Magnetic multilayers
• Strongly correlated systems
• Thin films
• Electron energy loss spectroscopy
• Electron microscopy
• Magnetization measurements