Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Phys Rev Lett. 2010 Sep 10;105(11):117204. doi: 10.1103/PhysRevLett.105.117204. Epub 2010 Sep 9.
We show that the magnetization of a thin ferromagnetic (Ga,Mn)As layer can be modulated by picosecond acoustic pulses. In this approach a picosecond strain pulse injected into the structure induces a tilt of the magnetization vector M, followed by the precession of M around its equilibrium orientation. This effect can be understood in terms of changes in magnetocrystalline anisotropy induced by the pulse. A model where only one anisotropy constant is affected by the strain pulse provides a good description of the observed time-dependent response.
我们证明了通过皮秒声波脉冲可以对一个薄的铁磁（Ga,Mn）As 层的磁化强度进行调制。在这种方法中，将皮秒应变脉冲注入到结构中会引起磁化强度矢量 M 的倾斜，随后 M 围绕其平衡方向进动。可以根据脉冲引起的磁晶各向异性的变化来理解这一效应。一个只受应变脉冲影响的一个各向异性常数的模型可以很好地描述观察到的随时间变化的响应。
