Study on the initial stage of thin film growth to control the structure of hetero-interface on the atomic level

这是由第一原则理论，Au/Co-Fe metallic multilayr will, show a largeperpendicular magnetic anisotropy. Then this system was actually prepared by molecular beam epitaxymethod and it is confirmed the perpendicular magnetic anisotropy energy of this system isactually larger than Au/Co multilayr. metallic multilayr is an artificial material which isfabricated by alternate deposition of a few kinds of different metals. Metallic multilayrs show someinteresting properties suoh as perpendicular magnetic anisotropy and giant magnetoresisitance. Theyare good candidates for high-density magneto-optical recording media. The存在hetero-interface, i.e.e interface between different metals，is responsible for these interesting physical properties.We have calculated the perpendicularmagnetic anisotropy energies of metallic multilayrs.它已经明确了both interfaceanisotropy and strain-induced anisotropy are responsible for perpendicular magnetic anisotropy. Itis also found that the interface anisotropy can be expressed as a function of the number of valenceelectrons in the system. in particular，这是预测一个Au/Co-Fe multilayr will exhibit a large perpendicular magnetic anisotropy of关于2 meV/unit cell This system was actually prepared by molecular beam epitaxy method. It wasconfirmed the perpendicular magnetic anisotropy of this system is larger than that of Au/Co.This结果suggests the possibility of controlling the magnetic anisotropy by changing the numberof valence electrons。

It is predicted by first-principles theory that Au/Co-Fe metallic multilayr will・show a large perpendicular magnetic anisotropy. Then this system was actually prepared by molecular beam epitaxy method and it is confirmed that the perpendicular magnetic anisotropy energy of this system is actually larger than Au/Co multilayr.Metallic multilayr is an artificial material which is fabricated by alternate deposition of a few kinds of different metals. Metallic multilayrs show some interesting properties suoh as perpendicular magnetic anisotropy and giant magnetoresisitance. They are good candidates for high-density magneto-optical recording media. The existence of hetero-interface, i.e.interface between different metals, is responsible for these interesting physical properties.We have calculated the perpendicular magnetic anisotropy energies of metallic multilayrs. It has been clarifed that both interface anisotropy and strain-induced anisotropy are responsible for perpendicular magnetic anisotropy. It is also found that the interface anisotropy can be expressed as a function of the number of valence electrons in the system. In particular, it is predicted that a Au/Co-Fe multilayr will exhibit a large perpendicular magnetic anisotropy of about 2 meV/unit cell This system was actually prepared by molecular beam epitaxy method. It was confirmed that the perpendicular magnetic anisotropy of this system is larger than that of Au/Co. This result suggests the possibility of controlling the magnetic anisotropy by changing the number of valence electrons.