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Magnetic recording based on coherent rotation is hitting its physical limitations. An alternative of driving magnetization reversal using an oscillating field has been proposed. We performed systematic studies of the magnetization reversal process in the presence of oscillating fields. The oscillating field reduces the coercivity significantly, and for isolated particles, we observed consistent results reported previously. For a circularly polarized field, we obtained a hysteresis loop that exhibits a behavior that would not be observed in the absence of oscillating fields.