This paper investigates a new application of nonlinear techniques for previous termvibrationnext termprevious termenergynext termprevious termharvestingnext term. The previous termSynchronousnext term Electric Charge previous termExtractionnext term (SECE) previous termenergynext termprevious termharvestingnext term technique for piezoelectric generators is extended and adapted to previous termelectromagneticnext term generators. This new circuit, which is the dual of the SECE circuit, is named SMFE for previous termSynchronousnext term Magnetic Flux previous termExtractionnext term. A theoretical model is developed, and the harvested power is simulated. Comparisons with a classical previous termenergynext termprevious termextractionnext term approach show that between 2.5 more power and 10% less power can be harvested, depending on the generator characteristics. It also allows the maximum power to be harvested whatever the value of the load. Finally, the SMFE circuit was embedded and tested on a simple centimeter-scale previous termelectromagneticnext term harvester. Measurements confirm the theoretical operating principle of the circuit.