EXCHANGE-COUPLED DOMAIN-WALLS - RESONANCE IN MULTILAYERS

Exchange coupling between magnetic films can lead to an attractive for ce between domain walls in the separate films. The coupling between th e films allows for small amplitude oscillations around the equilibrium configuration of the walls, analogous to optic and acoustic type spin wave resonance modes. Since the restoring force acts only over the le ngth of a domain wall, this suggests the possibility of sensitive meas urements of the local coupling by studying domain wall resonances. The effects of applied fields are also examined. With antiferromagnetic c oupling, small static fields push the walls apart and result in differ ent behaviors of the acoustic and optic domain wall resonances. (C) 19 97 American Institute of Physics.