Element Specificity of Transient Extreme Ultraviolet Magnetic Dichroism

Dewhurst, J. K.; Willems, Felix; Elliott, Peter; Li, Q. Z.; Schmising, Clemens von Korff; Strüber, Christian; Engel, Dieter; Eisebitt, Stefan; Sharma, S.

doi:10.1103/physrevlett.124.077203

Cited by 36 publications

(36 citation statements)

References 45 publications

(68 reference statements)

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“…In order to understand the difference between Co and CoPt, we first theoretically calculate the same observable as in the experiment, namely the transient helicity dependent absorption. This is done by performing linear-response calculations using the laser-excited state of the system at various times following the procedure detailed in Dewhurst et al 40 . Figure 3b displays the theoretical helicity dependent absorption at 60.3 eV for Co and CoPt.…”

Section: Resultsmentioning

confidence: 99%

“…Laser pulses used in the present work are linearly polarized (in-plane polarization) with a frequency of 1.55 eV, with a FWHM of 40 fs and incident fluence of 13 mJ/cm². The transient helicity dependent absorption is determined by performing linear-response calculations using the laser-excited state of the system at various times following the procedure detailed in 40 .…”

Section: Methodsmentioning

confidence: 99%

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Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy

et al. 2020

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Optically driven spin transport is the fastest and most efficient process to manipulate macroscopic magnetization as it does not rely on secondary mechanisms to dissipate angular momentum. In the present work, we show that such an optical inter-site spin transfer (OISTR) from Pt to Co emerges as a dominant mechanism governing the ultrafast magnetization dynamics of a CoPt alloy. To demonstrate this, we perform a joint theoretical and experimental investigation to determine the transient changes of the helicity dependent absorption in the extreme ultraviolet spectral range. We show that the helicity dependent absorption is directly related to changes of the transient spin-split density of states, allowing us to link the origin of OISTR to the available minority states above the Fermi level. This makes OISTR a general phenomenon in optical manipulation of multi-component magnetic systems.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy

et al. 2020

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“…In the spectral range between 45 and 72.5 eV, we can probe the local magnetization of Pt via the Pt O 2,3 and Pt N 7 resonances at 51.7, 65.3 and 71.2 eV, respectively [24,39]. For more details on the magneto-optical functions of the transition metals, as well as their ab initio description in a static and transient state, we refer to our recent works Willems et al [38] and Dewhurst et al [40].…”

Section: Static Magneto-optical Functionsmentioning

confidence: 99%

Element-Specific Magnetization Dynamics of Complex Magnetic Systems Probed by Ultrafast Magneto-Optical Spectroscopy

et al. 2020

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The vision to manipulate and control magnetism with light is driven on the one hand by fundamental questions of direct and indirect photon-spin interactions, and on the other hand by the necessity to cope with ever growing data volumes, requiring radically new approaches on how to write, read and process information. Here, we present two complementary experimental geometries to access the element-specific magnetization dynamics of complex magnetic systems via ultrafast magneto-optical spectroscopy in the extreme ultraviolet spectral range. First, we employ linearly polarized radiation of a free electron laser facility to demonstrate decoupled dynamics of the two sublattices of an FeGd alloy, a prerequisite for all-optical magnetization switching. Second, we use circularly polarized radiation generated in a laboratory-based high harmonic generation setup to show optical inter-site spin transfer in a CoPt alloy, a mechanism which only very recently has been predicted to mediate ultrafast metamagnetic phase transitions.

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“…Indeed, performing pure absorption measurements at X-ray free electron lasers (FELs) has been challenging, due to intrinsic fluctuations of the photon parameters and the lack of a reliable and linear incident intensity monitor [25]. However, motivated by time-resolved absorption experiments performed at femtoslicing facilities [17,22], as well as time-and spin-resolved photoelectron spectroscopy at high harmonic generation (HHG) sources [26,27], new technical advances were recently made to probe X-ray absorption dynamics using FEL [25,[28][29][30][31] and HHG [32,33], thereby laying the ground for a systematic analysis of charge and spin dynamics [30,34].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni M2,3-Edges

et al. 2020

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Ultrashort optical pulses can trigger a variety of non-equilibrium processes in magnetic thin films affecting electrons and spins on femtosecond timescales. In order to probe the charge and magnetic degrees of freedom simultaneously, we developed an X-ray streaking technique that has the advantage of providing a jitter-free picture of absorption cross-section changes. In this paper, we present an experiment based on this approach, which we performed using five photon probing energies at the Ni M2,3-edges. This allowed us to retrieve the absorption and magnetic circular dichroism time traces, yielding detailed information on transient modifications of electron and spin populations close to the Fermi level. Our findings suggest that the observed absorption and magnetic circular dichroism dynamics both depend on the extreme ultraviolet (XUV) probing wavelength, and can be described, at least qualitatively, by assuming ultrafast energy shifts of the electronic and magnetic elemental absorption resonances, as reported in recent work. However, our analysis also hints at more complex changes, highlighting the need for further experimental and theoretical studies in order to gain a thorough understanding of the interplay of electronic and spin degrees of freedom in optically excited magnetic thin films.

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Element Specificity of Transient Extreme Ultraviolet Magnetic Dichroism

Cited by 36 publications

References 45 publications

Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy

Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy

Element-Specific Magnetization Dynamics of Complex Magnetic Systems Probed by Ultrafast Magneto-Optical Spectroscopy

Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni M2,3-Edges

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