Radboud University Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, Netherlands.
Phys Rev Lett. 2010 Sep 3;105(10):107402. doi: 10.1103/PhysRevLett.105.107402.
The effective magnetic field induced by a femtosecond pulse of circularly polarized light, via the inverse Faraday effect, is shown to excite a magnetic-dipole forbidden exchange spin resonance in a lutetium iron garnet. An external magnetic field cannot excite this mode, as the iron sublattices have the same gyromagnetic ratio and no net torque can be applied between them. However, since the sublattices have different magneto-optical susceptibilities, the inverse Faraday effect induces different effective fields on different iron sites, allowing excitation.
通过反法拉第效应，圆偏振飞秒光脉冲产生的有效磁场被显示能在镥铁石榴石中激发一个磁偶极子禁戒的交换自旋共振。由于铁亚晶格具有相同的旋磁比，因此外部磁场不能激发这个模式，其间不能施加净扭矩。但是，由于亚晶格具有不同的磁光磁化率，反法拉第效应在不同的铁位上诱导不同的有效场，从而允许激发。
