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Modulation of magnetic properties through voltage-driven ion motion and redoxprocesses, i.e., magneto-ionics, is a unique approach to control magnetism withelectric field for low-power memory and spintronic applications. So far,magneto-ionics has been achieved through direct electrical connections to theactuated material. Here we evidence that an alternative way to reach suchcontrol exists in a wireless manner. Induced polarization in the conductingmaterial immersed in the electrolyte, without direct wire contact, promoteswireless bipolar electrochemistry, an alternative pathway to achievevoltage-driven control of magnetism based on the same electrochemical processesinvolved in direct-contact magneto-ionics. A significant tunability ofmagnetization is accomplished for cobalt nitride thin films, includingtransitions between paramagnetic and ferromagnetic states. Such effects can beeither volatile or non-volatile depending on the electrochemical cellconfiguration. These results represent a fundamental breakthrough that mayinspire future device designs for applications in bioelectronics, catalysis,neuromorphic computing, or wireless communications.

Wireless magneto-ionics: voltage control of magnetism by bipolar electrochemistry