Time resolved imaging of magnetic nanostructures with magnetic transmission soft X-ray microscopy

磁透射软X射线显微术是一种利用X射线磁圆二色性作为大对比度机制对铁磁系统中磁畴结构进行成像的新技术。它具有元素特异性，横向分辨率低至25 nm，对薄磁性层具有高灵敏度。具有面内和面外磁化的两种系统都可以在变化的外部磁场内记录。因此，可以解决磁性元件中各个层的切换行为。该方案的目标是利用泵浦探测技术实现同步辐射光源的频闪成像。因此，可以研究磁有序多层和纳米结构元件中的动力学过程。这将为基本问题提供新的见解，而且是在技术背景下。所获得的结果将是互补的其他磁成像技术，并将作为高分辨率的实验输入到快速开关过程的数值模拟。

Magnetic transmission soft X-ray microscopy is a novel technique using X-ray magnetic circular dichroism as large contrast mechanism to image magnetic domain structures in ferromagnetic systems. It features element-specificity, a lateral resolution down to 25 nm and a high sensitivity to thin magnetic layers. Both systems with in-plane and out-of-plane magnetization can be recorded within varying external magnetic fields. Thus the switching behaviour of individual layers in magnetic elements can be addressed. The goal of this proposal is to implement the time structure of the synchrotron radiation light source by a stroboscopic imaging with a pump-probe technique. Thus dynamical processes in magnetically ordered multilayered and nanostructured elements can be studied. This will both provide new insight into fundamental questions but moreover in a technological context. The results obtained will be complimentary to other magnetic imaging techniques and will serve as high resolution experimental input to numerical simulations of fast switching processes.