Vlutters R, van't Erve O M J, Kim S D, Jansen R, Lodder J C
Systems and Materials for Information Storage Group, MESA+ Research Institute, University of Twente, 7500 AE Enschede, The Netherlands.
Phys Rev Lett. 2002 Jan 14;88(2):027202. doi: 10.1103/PhysRevLett.88.027202. Epub 2001 Dec 26.
The relative importance of interface, volume, and thermal scattering in spin-dependent hot-electron transmission of magnetic trilayers is quantified. While interfaces produce significant attenuation (factor 2.2 per interface), the spin asymmetry is dominated by volume scattering. Extracted thermal attenuation lengths (130 A at 300 K for Ni80Fe20) show that thermal spin-wave scattering is stronger than hitherto assumed. This suggests that spontaneous spin-wave emission, rather than the details of the spin-dependent band structure, may cause the strong filtering of minority hot-electron spins.
在磁性三层膜的自旋相关热电子传输中，界面、体积和热散射的相对重要性得到了量化。虽然界面会产生显著的衰减（每个界面衰减因子为2.2），但自旋不对称性主要由体积散射主导。提取的热衰减长度（在300 K时，Ni80Fe20的热衰减长度为130 Å）表明，热自旋波散射比迄今所假设的更强。这表明，自发自旋波发射而非自旋相关能带结构的细节，可能导致少数热电子自旋的强过滤。
