Orbital currents and accumulation provide a new avenue to boost spintronic effects in nanodevices. Here, we use interconversion effects between charge current and orbital angular momentum to demonstrate a dramatic increase in the magnon spin injection and detection efficiencies in nanodevices consisting of a magnetic insulator contacted by $\mathrm{Pt}/{\mathrm{CuO}}_{\mathrm{x}}$ electrodes. Moreover, we note distinct variations in efficiency for magnon spin injection and detection, indicating a disparity in the direct and inverse orbital Rashba-Edelstein effect efficiencies.

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• Electrical spin injection
• Magnons
• Spin generation
• Spin injection
• Spin waves
• Spintronics