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It is shown that the deformations in thin ferromagnetic films submitted a t a magnetic perpendicular field involve the existence of "symmetrical walls", energies which widths are calculated. The experimental study is achieved by the Lorentz microscopy where a peculiar contrast is associated with those walls.Dans cet article, nous montrons que les deformations d'une couche mince ferromagnetique soumise B un champ magnetique perpendiculaire entrainent la presence de "parois symktriques" de largeurs et energies calculkes. L'Btude experimentale est realisee en microscopic de Lorentz oh un contraste particulier est associe i i ce type de paroi. Origin of Symmetrical WallsThe effective field through a ferromagnetic sample within a magnetic field H,is given by with M saturation magnetization and N , , demagnetization tensor.In uniformly magnetized materials it is 2 N , = 4 n [l]. For a very thin layer, the principal components Nr I directed, respectively, parallel and perpendicular to the layer are [0, 0, 4 z ] . The effective field parallel to the layer will bewhere iy is the angle between H, and the normal to the layer; it will be zero in a direction normal to the layer. Thin-waved layer in a magnetic fieldSuch a layer represented by a dihedral is submitted to a magnetic field H,. The direction of H, parallel to the symmetric plane of the dihedral is normal to the ridge (Fig. 1 ) . The components of H, parallel to the surface are symmetric relatively to the bisector plane. I n order to simplify, the easy axis Oy is supposed to be normal to the edge of the wedge. The magnetization vector will turn symmetrically from each side by the fold of an angle 8, given by [ 2 ]where 8 is the angle between the magnetization and the easy direction, H K = = 2 KIM with K being the uniaxial anisotropy constant,.The direction of magnetization is submitted to a discontinuity of 2 8 on the ridge of the dihedral. However, such a direction must be continuous (due to the exchange energy E = A(V 8)z). We must therefore introduce a transition zone or wall, symmetric relatively to the bisector plan of the wedge [3].

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