X-ray magnetic circular dichroism probed using high harmonics

Patrik Grychtol*, Ofer Kfir, Ronny Knut, Ronny Knut, Emrah Turgut, Dmitriy Zusin, Dimitar Popmintchev, Tenio Popmintchev, Hans Nembach, Justin Shaw, Avner Fleischer, Henry Kapteyn, Margaret Murnane, Oren Cohen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We demonstrate the first generation and phase matching of circularlypolarized high harmonics, which are bright enough for X-ray magnetic circular dichroism measurements at the M absorption edges of the magnetic materials Fe, Co and Ni. Circularly polarized light in the extreme ultraviolet (EUV) and soft X-ray regions of the electromagnetic spectrum is extremely useful for exploring chirality-sensitive light-matter interactions. X-ray magnetic circular dichroism (XMCD) makes it possible to extract detailed information about the magnetic state of matter and its interaction with phononic and electronic degrees of freedom on femtosecond time scales and nanometer length scales. Specifically, XMCD can be used to distinguish between spin and orbital contributions to the atomic magnetic moment in ferromagnetic materials, with element-specificity, which is not possible using ultrafast visible laser spectroscopy. To date, circularly polarized EUV and soft X-ray beams were restricted to large-scale electron storage facilities, such as synchrotrons and Xray free electron lasers. Such facilities have great advantages of high peak and average powers in the X-ray region. However, drawbacks include experimental complexity, limited access and temporal resolution, as well as pump/probe jitter.

Original languageEnglish
Title of host publicationUltrafast Phenomena XIX - Proceedings of the 19th International Conference
EditorsLouis DiMauro, Regina de Vivie-Riedle, Kaoru Yamanouchi, Makoto Kuwata-Gonokami, Steven Cundiff
PublisherSpringer Science and Business Media, LLC
Number of pages4
ISBN (Electronic)9783319132419
StatePublished - 2015
Externally publishedYes
Event19th International Conference on Ultrafast Phenomena, 2014 - Okinawa, Japan
Duration: 7 Jul 201411 Jul 2014

Publication series

NameSpringer Proceedings in Physics
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941


Conference19th International Conference on Ultrafast Phenomena, 2014


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