Magnetization dynamics of nanostructured magnet in a large amplitude field

在本研究项目中，研究了具有垂直各向异性的纳米级磁体在亚纳秒时间范围内的磁化行为。研制了一种可与磁化反转时间相媲美的亚纳秒脉冲场发生器。对Co/Pd和Co/Pt多层膜的单点样品进行了磁化反转实验。这些点的磁化反转是由一个交换长度的胚胎控制的，这些胚胎的行为可以用一个从亚纳秒到静态时间段的热激活模型来很好地描述。

In this research project magnetization behavior of nanoscal magnets with perpendicular anisotropy in sub-nanoseconds time regime has been investigated. A Pulse field generator with sub nanoseconds duration, which is comparable with magnetization reversal time, was developed. Magnetization reversal experiments were carried out on single dots of Co/Pd and Co/Pt multi layers. Magnetization reversal of those dots is governed by an embryo with a dimension of exchange length, and the behavior of those embryos can be well described with a thermally activated model from sub-nanoseconds to static time regime.