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Ferrites are critical for nonreciprocal RF/microwave devices.However, they are generally bulky, and tuning of working frequency is slow if using magnetic field.Convenient electrical tuning of frequency and bandwidth of such microwave devices have been investigated and demonstrated in several approaches.Of particular interest is self-assembled 1-3 dimensional pervoskite-spinel nanocomposite films with magnetic spinel nano rods embedded in piezoelectric perovskite matrix, which have the joint advantages of high, tunable working frequency due to the magnetic shape anisotropy and magnetoelectdc effect.