Origin of the force exciting domain wall deformation in a thin magnetic film

The origin of the pinning force acting on Bloch or Neel domain walls in thi n magnetic films with a uniaxial anisotropy is discussed. The energy change s are investigated assuming that initially the external magnetic field indu ces the bulge of the domain wall attended with the pinning of the wall edge s. The critical values of the field when the wall moves to a new equilibriu m state were determined. The 'magnetic pressure' and the pinning force are calculated from the changes of the wall energy determined for both kinds of domain walls. These results provide a possibility to obtain the contributi on of the exchange energy at the wall deformation and to evaluate the influ ence of this energy on the wall behavior around the magnetic defects. (C) 1 999 Elsevier Science B.V. All rights reserved.