Domain walls in antiferromagnetically coupled multi-layered films

Energy comparison between Neel type and Bloch type walls is performed for antiferromagnetically coupled multilayered magnetic thin films. For the derivation of energy formulae, the coupling is dealt with as an effective field, H_s, which acts as a kind of uniaxial anisotropy. This causes substantial reduction in the width of the walls in the Neel and the Bloch types and an increase in the wall energy. Energy calculations are performed for [2 nm Co/1 nm Cu] multilayered films. It is confirmed that for higher H_s than about 8 kOe, there is a possibility of forming such Block types walls, as the magnetizations in the adjacent layers point antiparallel to each other. These are named antiparallel Bloch walls