Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses
Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses
复制标题
DOI：
10.1088/1367-2630/18/1/013019
复制
发表时间：
2016-01-08
影响因子：
3.3
通讯作者：
Hauri, Christoph P.
中科院分区：
文献类型：
--
作者：
Shalaby, Mostafa;Vicario, Carlo;Hauri, Christoph P.
磁化反转的速度是磁数据存储的一个关键特征。最近，强太赫兹脉冲产生的磁场已被证明可以在亚皮秒时间尺度上在钴薄膜中感应出小的磁化动态。在这里，我们表明，在较高的场强度下，太赫兹电场开始发挥作用，强烈改变钴薄膜的介电性能。发现电子和磁响应同时发生，电场响应持续的时间尺度比太赫兹刺激长几个数量级。
The speed of magnetization reversal is a key feature in magnetic data storage. Magnetic fields from intense THz pulses have been recently shown to induce small magnetization dynamics in a cobalt thin film on the sub-picosecond time scale. Here, we show that at higher field intensities, the THz electric field starts playing a role, strongly changing the dielectric properties of the cobalt thin film. Both the electronic and magnetic responses are found to occur simultaneously, with the electric field response persistent on a time scale orders of magnitude longer than the THz stimulus.