Zhang G P, Hübner W
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
Phys Rev Lett. 2000 Oct 2;85(14):3025-8. doi: 10.1103/PhysRevLett.85.3025.
The laser-induced femtosecond demagnetization in ferromagnetic metals is investigated theoretically. Different from the conventional nanosecond one, this ultrafast demagnetization is a cooperative effect of the external laser field and the internal spin-orbit coupling. The spin-orbit coupling smears out the original identities of triplets and singlets while the laser field uses it as an avenue to influence demagnetization. Importantly, this demagnetization can be manipulated controllably, an essential point to future applications, such as ultrafast control of magneto-optical gating. Finally, the polarization filter effect on the ultrafast time scale is discussed based upon the present theoretical results.
对铁磁金属中激光诱导的飞秒退磁进行了理论研究。与传统的纳秒退磁不同，这种超快退磁是外部激光场和内部自旋 - 轨道耦合的协同效应。自旋 - 轨道耦合消除了三重态和单重态的原始特性，而激光场将其作为影响退磁的途径。重要的是，这种退磁可以被可控地操纵，这是未来应用（如磁光门控的超快控制）的关键要点。最后，基于目前的理论结果讨论了超快时间尺度上的偏振滤波效应。
