The formation of out-of-plane magnetization states in ultrathin films is an important problem for general knowledge and in terms of application for data storage. Discussion of the reorientation phase transitions (RPT) from  out-of-plane magnetization into in-plane  magnetization state  is focused on metallic nanostructures.  The RPT can be induced by different changes of: (i) magnetic layer thickness d; (ii) buffer and (iii) overlayer structures [1]. Changes of such overlayer thicknesses on nanometer or even sub-nanometer level are responsible for the appearance of the RPT. Magnetization spatial distributions were studied by micromagnetic simulations and novel types of distributions were found [2,3]. Approaching the RPT magnetic domain structure in ultrathin film changes from the classical Kittel structure into sinusoidal-like one; domain structure size drastically decreases down to sub-micrometer range. By shrinking the lateral size of a nanostructure one can induce reorientation from an in-plane to an out-of-plane magnetization state. Geometrically constrained magnetization distributions will be discussed using as examples nanodisks and nanowires.

The work was supported by the project EC MC ToK NANOMAG-LAB Combined study of nanostructured magnetic materials.  

1. M.Kisielewski, A.Maziewski, M.Tekielak, A.Wawro and  L.T.Baczewski, Phys. Rev.Lett. 89, 8, 87203 (2002).

2. M. Kisielewski, A. Maziewski, T. Polyakova, and V. Zablotskii, Phys.Rev.B 69 (2004) 184419.

3. Maziewski, V. Zablotskii, and M. Kisielewski, Phys. Rev. B 73 (2006) 134415.

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