Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization
Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization
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使用高次谐波的谐振法拉第效应研究超快退磁
DOI：
10.1103/physrevb.100.144421
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发表时间：
2019
影响因子：
3.7
通讯作者：
B. Vodungbo
中科院分区：
文献类型：
--
作者：
Carla Alves;G. Lambert;V. Malka;M. Hehn;G. Malinowski;Marcel Hennes;V. Chardonnet;E. Jal;J. Lüning;B. Vodungbo
在过去的几年中，高次谐波产生（HHG）通过提供桌面和负担得起的飞秒极紫外（EUV）和软x射线源，为超快光谱领域开辟了一个更大的社区。特别是，飞磁学领域在很大程度上得益于这些来源的发展。然而，使用x射线磁圆二色性（XMCD）作为一种最通用和可靠的磁化探针，受到HHG源缺乏偏振控制的限制，因此研究依赖于更具体的磁光效应。即使是最近在产生椭圆偏振谐波方面的进展，也只导致了一些依赖于这种强大技术的时间分辨实验，因为它们增加了本已困难的测量的复杂性。在本文中，我们展示了如何通过利用法拉第效应，轻松地探测具有类似于XMCD的多功能性的线性极化EUV或软x射线光的磁化动力学。在Co M边缘周围给出了法拉第效应的静态和时间分辨测量。利用简单的理论考虑，我们展示了如何从法拉第旋转和椭圆瞬态中检索样品的磁化动力学。用该方法测量了几纳米钴基样品在面外和面内两种磁化结构下的超快退磁动力学，显示了该方法在飞磁学研究中的巨大潜力。
During the past few years high-order harmonic generation (HHG) has opened up the field of ultrafast spectroscopy to an ever larger community by providing a table-top and affordable femtosecond extreme ultraviolet (EUV) and soft-x-ray source. In particular, the field of femtomagnetism has largely benefited from the development of these sources. However, the use of x-ray magnetic circular dichroism (XMCD) as a probe of magnetization, the most versatile and reliable one, has been constrained by the lack of polarization control at HHG sources, so studies have relied on more specific magneto-optical effects. Even the recent developments on the generation of elliptically polarized harmonics have only resulted in a few time-resolved experiments relying on this powerful technique since they add complexity to already-difficult measurements. In this article we show how to easily probe magnetization dynamics with linearly polarized EUV or soft-x-ray light with a versatility similar to XMCD by exploiting the Faraday effect. Static and time-resolved measurements of the Faraday effect are presented around the Co M edges. Using simple theoretical considerations, we show how to retrieve the samples magnetization dynamics from the Faraday rotation and ellipticity transients. Ultrafast demagnetization dynamics of a few nanometers in Co-based samples are measured with this method in out-of-plane as well as in-plane magnetization configurations, showing its great potential for the study of femtomagnetism.
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DOI：
10.1073/pnas.1201371109
发表时间：
2012-03-27
影响因子：
11.1
作者：
Mathias, Stefan;La-O-Vorakiat, Chan;Kapteyn, Henry C.
通讯作者：
Kapteyn, Henry C.
影响因子：
16.6
作者：
通讯作者：
--
影响因子：
16.6
作者：
Rudolf, Dennis;La-O-Vorakiat, Chan;Oppeneer, Peter M.
通讯作者：
Oppeneer, Peter M.
影响因子：
35
作者：
Kfir, Ofer;Grychtol, Patrik;Cohen, Oren
通讯作者：
Cohen, Oren