Bulg. J. Phys. vol.27 no.S3 (2000), pp. 017-020



Energy Minimisation in Amorphous Ribbon Materials

N. Derebasi
Uludağ Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, 16059 Görükle, Bursa, Turkey
Abstract. A short development of magnetic domain theory and the properties of ferromagnetic materials can be explained by the macroscopic properties and the principle of energy minimisation. In ferromagnetic materials the magnetic domains exist in a large volumes which the atomic magnetic moments are aligned parallel due to the strong molecular field. The magnetostatic, inagnetocrystalline, magnetoelastic, exchange and domain wall energies determine the domain structure in a ferromagnetic crystal. The domain wall has an optimum thickness due to the exchange and magnetocrystalline anisotropy energies within the wall. A certain number of 180o domain occurs as a results of an interaction between the magnetoelastic and domain wall energies in an iron crystal. In amorphous ribbons a leaf domain pattern exists. But they become as a bar domain when an external stress is applied.

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