Spin-Orbit Hybridization Points in the Face-Centered-Cubic Cobalt Band Structure

作     者：M. Pickel A. B. Schmidt F. Giesen J. Braun J. Minár H. Ebert M. Donath M. Weinelt 

作者机构：Physikalisches Institut Westfälische Wilhelms-Universität Münster Wilhelm-Klemm-Straße 10 48149 Münster Germany Max-Born-Institut Max-Born-Straße 2A 12489 Berlin Germany Department Chemie und Biochemie Physikalische Chemie Ludwig-Maximilians Universität München 81377 München Germany Freie Universität Berlin Fachbereich Physik Arnimallee 14 14195 Berlin Germany 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2008年第101卷第6期

页      面：066402-066402页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Deutsche Forschungsgemeinschaft [SPP 1133] Bundesministerium fur Bildung und Forschung 

主　　题：Band structure 

摘      要：Linear magnetic dichroism is observed in spin-, time-, and energy-resolved two-photon photoemission from valence bands of epitaxial fcc cobalt on Cu(001). With image-potential states as spectator states we identify initial bulk and surface states with minority spin character as the source for dichroic intensities and apparent dichroic lifetimes. Excellent agreement with ab initio fully relativistic calculations of the cobalt fcc band structure allows us to precisely determine spin-orbit hybridization points close to the Fermi level. These spin hot spots enhance spin-flip scattering by several orders of magnitude and are therefore assumed to be crucial in ultrafast demagnetization.