Bistable behavior of active ring resonator on surface spin waves Vitalii V. Vitko, Andrey A. Nikitin, Roman V. Haponchyk, Andrey A. Stashkevich, Mikhail P. Kostylev and Alexey B. Ustinov Eur. Phys. J. Plus, 137 9 (2022) 1010 Published online: 06 September 2022 DOI: 10.1140/epjp/s13360-022-03213-5