Time and Spatially Resolved Hard X-Ray MCD Measurement on a Co/Pt Multilayer Dot Excited by Pulsed RF Field
Time and Spatially Resolved Hard X-Ray MCD Measurement on a Co/Pt Multilayer Dot Excited by Pulsed RF Field
复制标题
对脉冲 RF 场激励的 Co/Pt 多层点进行时间和空间分辨硬 X 射线 MCD 测量
DOI：
10.1109/tmag.2017.2745211
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发表时间：
2018
影响因子：
2.1
通讯作者：
and Osamu Kitakami
中科院分区：
文献类型：
--
作者：
Nobuaki Kikuchi;Hitoshi Osawa;Motohiro Suzuki;and Osamu Kitakami
理解磁性纳米结构的磁化行为是未来磁性/自旋电子器件的关键问题。时间分辨X射线磁圆二色性（XMCD）是一种具有纳米级空间分辨率、皮秒级时间分辨率和元素选择性的强有力的测量技术。我们利用硬X射线探测SPring-8的BL 39 XU的Pt L3边缘的XMCD，对Co/Pt多层膜点进行了时间和空间分辨的XMCD显微测量。研究了直径为2.6 μm的Co/Pt多层膜点在频率约为2.5GHz、最大振幅约为400 Oe的脉冲射频场作用下的瞬态磁响应。用亚微米级的纳米晶，可以清楚地观察到点中感生Pt磁矩的磁化进动的增长。100 ps时间分辨率和亚微米空间分辨率。所开发的测量装置可以适用于广泛的时间分辨硬X射线实验的研究。
Understanding of magnetization behavior in magnetic nanostructures is a key issue for future magnetic/spintronic devices. Time-resolved X-ray magnetic circular dichroism (XMCD) is a powerful measurement technique with potential of nanometer spatial resolution, picosecond time resolution, and element selectivity. We have carried out time and spatially resolved XMCD microscopy measurement on a Co/Pt multilayer dot by detecting XMCD at the Pt L3edge at BL39XU of SPring-8 using hard X-ray. Transient magnetic response of Co/Pt multilayer dots with diameter of 2.6 μm was investigated against pulsed RF field with frequency around 2.5 GHz and the maximum amplitude of about 400 Oe. By synchronizing excitation RF field pulse with X-ray pulses, the growth of magnetization precession of the induced Pt magnetic moment in the dot was clearly observed with sub-100 ps time resolution and submicrometer spatial resolution. The developed measurement setup can be applicable for a wide range of studies for time-resolved hard X-ray experiments.