Skip to Main content Skip to Navigation
Journal articles

Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization

Abstract : 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.
Complete list of metadata

Cited literature [39 references]  Display  Hide  Download
Contributor : Gregory Malinowski <>
Submitted on : Tuesday, October 29, 2019 - 3:15:21 PM
Last modification on : Thursday, March 11, 2021 - 2:26:02 PM
Long-term archiving on: : Thursday, January 30, 2020 - 8:13:09 PM


2019-Alves-Resonant Faraday ef...
Files produced by the author(s)



Carla Alves, Guillaume Lambert, Victor Malka, Michel Hehn, Grégory Malinowski, et al.. Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2019, 100 (14), ⟨10.1103/PhysRevB.100.144421⟩. ⟨hal-02337593⟩



Record views


Files downloads