The Single Ion Model Concerning the Magnetic Anisotropy of TbCo Thin Film

The single ion model of the perpendicular magnetic anisotropy in TbCo amorphous film has been proposed,according to the anisotropic arrangement of the nearest neighbor atoms around rare atom in film sputtering deposition process,and the perpendicular magnetic anisotropy energy of these films is calculated.The calculation results are in good accordance with experimental results.The results shows that the interactions between the non-S state Tb ion in nonspherical electric charge distribution and the deformed local crystalline field,accounts for the major source of perpendicular magnetic anisotropy of TbCo amorphous films.