The electric field control of the exchange bias has considerable application scope in modern spintronic devices such as magnetic random-access memories. Herein, we utilize an all-solid-state $\mathrm{Li}$-ion redox capacitor with an antiferromagnetic electrode for reversible control of the exchange bias in a $\mathrm{Co}/{\mathrm{Co}}_3{\mathrm{O}}_4$ heterostructure. The controlled intercalation and deintercalation of Li ions in the antiferromagnetic ${\mathrm{Co}}_3{\mathrm{O}}_4$ anode via galvanostatic charge and discharge enables reversible and nonvolatile control of the exchange bias. The mechanism of exchange-bias control in the $\mathrm{Co}/{\mathrm{Co}}_3{\mathrm{O}}_4$ heterostructure is studied using various characterization techniques. This work establishes an approach to control the exchange bias in all-solid-state magnetoionics, which is of great practical importance for the development of modern spintronic devices.

• Received 26 November 2019
• Revised 29 April 2020
• Accepted 2 July 2020

DOI:https://doi.org/10.1103/PhysRevApplied.14.014062