Magnetic surfaces |
| |
Authors: | Bayreuther G |
| |
Institution: | 1.Institut für Angewandte Physik, UniversitÄt Regensburg, D-8400, Regensburg, FRG ; |
| |
Abstract: | The magnetic ground state, magnetic anisotropies and spin excitations of surfaces, interfaces and ultra-thin films of ferromagnetic
3d-metals are discussed. Enhanced magnetic ground state moments and altered hyperfine fields as predicted by ab initio band
calculations have not been conclusively verified by experiments up to now. Future calculations should take into account dipolar
fields and the role of interface roughness. Very large magnetic anisotropies are observed at magnetic surfaces and interfaces.
In Ni/Cu multilayered films, the superposition of surface and stress-induced anisotropies was used to switch the easy axis
of magnetization from the film plane to a perpendicular orientation by a proper choice of the Ni layer thickness. This could
be an attractive possibility to develop new magnetic materials for technical applications. The temperature dependence of the
spontaneous magnetization at surfaces and in ultra-thin films deviates from the behaviour of bulk material. Size effects as
well as surface effects of spin wave excitations are discussed, comparing theoretical and experimental results. The need for
more complete theories including surface exchange, surface anisotropy and realistic surface structures is emphasized. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|