Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
Phys Rev Lett. 2011 Sep 9;107(11):117202. doi: 10.1103/PhysRevLett.107.117202. Epub 2011 Sep 8.
Using 100 fs laser pulses, a high-frequency exchange and a low-frequency ferromagnetic resonance mode have been excited and detected in an amorphous Gd(1-x)Co(x) (78≤x≤85) ferrimagnetic thin film, on both sides of its angular momentum compensation composition. The excitation efficiency of these modes strongly depends on the amount of laser-induced heating. Ways of selectively and efficiently exciting either one or both of these two coexisting magnetic modes by adjusting laser pulse intensity are demonstrated.
使用 100fs 激光脉冲，在非晶态 Gd(1-x)Co(x)（78≤x≤85）铁磁薄膜的角动量补偿组成两侧，激发并检测到高频交换和低频铁磁共振模式。这些模式的激发效率强烈依赖于激光诱导加热的量。通过调节激光脉冲强度，展示了选择性和有效地激发这两种共存的磁模式之一或两者的方法。
