Vomir M, Andrade L H F, Guidoni L, Beaurepaire E, Bigot J-Y
Institut de Physique et Chimie des Matériaux de Strasbourg, Unité Mixte 7504 CNRS, Université Louis Pasteur BP. 43, 23 rue du Loess, 67034 Strasbourg Cedex, France.
Phys Rev Lett. 2005 Jun 17;94(23):237601. doi: 10.1103/PhysRevLett.94.237601. Epub 2005 Jun 14.
We have measured the real space trajectory of the ultrafast magnetization dynamics in ferromagnetic metals induced by femtosecond optical pulses. Our approach allows the observation of the initial change of the modulus and orientation of the magnetization, occurring within a few hundreds of femtoseconds, as well as its subsequent precession and damping around the effective field. The role of the magnetocrystalline anisotropy shows up in the magnetization reorientation occurring during the electron-lattice relaxation. In addition, we propose a model which takes into account the initial demagnetization in the Bloch formalism describing the magnetization dynamics.
我们测量了飞秒光脉冲诱导的铁磁金属中超快磁化动力学的实空间轨迹。我们的方法能够观察到磁化强度模量和方向在几百飞秒内发生的初始变化，以及其随后围绕有效场的进动和阻尼。磁晶各向异性的作用在电子 - 晶格弛豫过程中发生的磁化重新取向中显现出来。此外，我们提出了一个在描述磁化动力学的布洛赫形式体系中考虑初始退磁的模型。
