Coherent Magnetization Precession in Ferromagnetic (Ga,Mn) As Induced by Picosecond Acoustic Pulses
Coherent Magnetization Precession in Ferromagnetic (Ga,Mn) As Induced by Picosecond Acoustic Pulses
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DOI：
10.1103/physrevlett.105.117204
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发表时间：
2010-09-09
影响因子：
8.6
通讯作者：
Bayer, M.
中科院分区：
文献类型：
--
作者：
Scherbakov, A. V.;Salasyuk, A. S.;Bayer, M.
我们表明，一个薄的铁磁（Ga，Mn）As层的磁化强度可以调制的皮秒声脉冲。在这种方法中，皮秒应变脉冲注入到结构中引起磁化矢量M的倾斜，随后是M围绕其平衡取向的进动。这种效应可以用脉冲引起的磁晶各向异性的变化来理解。只有一个各向异性常数受到应变脉冲影响的模型可以很好地描述观察到的时间相关响应。
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.