Abstract
To investigate the possibility of a magnetization-buckling mode in a perpendicular magnetic film with columnar structure, the magnetic energy of the film is calcu lated on the assumption that the film is a two-dimensional array of single-domain prisms. From the energy, the nucleation field HN is calculated and compared with HN for the magnetization-curling and coherent-rotation modes. It is found that the magnetization rotates in the coherent-rotation mode for a small reduced-radius S and in the curling mode for a large S. The buckling mode occurs in the range of S between the ranges for the coherent-rotation and curling modes. However, the range of S in which the buckling mode occurs is very small or non-existent when the space between the crystallites and the axial ratio of the crystallite constituting the film are small. Moreover, HN in the buckling mode is very close to HN in the coherent-rotation mode. Therefore the buckling mode need not be taken into account in perpendicular magnetic films with columnar structure.
