Stamm C, Tudosa I, Siegmann H C, Stöhr J, Dobin A Yu, Woltersdorf G, Heinrich B, Vaterlaus A
Stanford Linear Accelerator Center, California 94309, USA.
Phys Rev Lett. 2005 May 20;94(19):197603. doi: 10.1103/PhysRevLett.94.197603. Epub 2005 May 19.
Applying one ultrashort magnetic field pulse, we observe up to 10 precessional switches of the magnetization direction in single crystalline Fe films of 10 and 15 atomic layers. We find that the rate at which angular momentum is dissipated in uniform large angle spin precession increases with time and film thickness, surpassing the intrinsic ferromagnetic resonance spin lattice relaxation of Fe by nearly an order of magnitude.
施加一个超短磁场脉冲，我们在10和15个原子层的单晶铁薄膜中观察到磁化方向多达10次的进动切换。我们发现，在均匀大角度自旋进动中角动量耗散的速率随时间和薄膜厚度增加，比铁的本征铁磁共振自旋晶格弛豫快近一个数量级。
