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The nonlinear oscillation of a uniform cantilever is investigated.One small magnet is fixed at the free end.Another magnet is fixed at the host device and perpendicularly attracted by the previous one.The structural damping is modeled by the Kelvin viscoelastic relationship.The initial distance between the two magnets is an important parameter.Only if the initial distance is large enough, the cantilever has two static equilibria, one of which is stable and the other is unstable.