000624388 001__ 624388
000624388 005__ 20250310221550.0
000624388 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-00857
000624388 0247_ $$2arXiv$$aarXiv:2502.03301
000624388 037__ $$aPUBDB-2025-00857
000624388 041__ $$aEnglish
000624388 088__ $$2arXiv$$aarXiv:2502.03301
000624388 1001_ $$0P:(DE-H253)PIP1032134$$aMarotzke, S.$$b0$$udesy
000624388 245__ $$aFirst experiments with ultrashort, circularly polarized soft X-ray pulses at FLASH2
000624388 260__ $$c2025
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000624388 520__ $$aTime-resolved absorption spectroscopy as well as magnetic circular dichroism with circularly polarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic and magnetic dynamics in magnetic materials element- and site-selectively. Employing these methods, groundbreaking results have been obtained for instance for magnetic alloys, which helped to fundamentally advance the field of ultrafast magnetization dynamics. At the free electron laser facility FLASH key capabilities for ultrafast XAS and XMCD experiments have recently improved: In an upgrade, an APPLE-III helical afterburner undulator was installed at FLASH2 in September 2023. This installation allows for the generation of circularly polarized soft X-ray pulses with a duration of a few tens of femtoseconds covering the L3,2-edges of the important 3d transition metal elements with pulse energies of several uJ. Here, we present first experimental results with such ultrashort X-ray pulses from the FL23 beamline employing XMCD at the L-edges of the 3d metals, Co, Fe and Ni. We obtain significant dichroic difference signals indicating a degree of circular polarization close to 100%. With the pulse-length preserving monochromator at beamline FL23 and an improved pump laser setup, FLASH can offer important and efficient experimental instrumentation for studies on ultrafast spin dynamics in 3d transition metals, multilayers, and alloys.
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000624388 536__ $$0G:(GEPRIS)328545488$$aDFG project G:(GEPRIS)328545488 - TRR 227: Ultraschnelle Spindynamik (328545488)$$c328545488$$x2
000624388 536__ $$0G:(DE-Ds200)BMBF-05K22KE2$$a05K22KE2 - Messplatz für ultraschnelle Spindynamik bei FLASH (BMBF-05K22KE2)$$cBMBF-05K22KE2$$f05K22KE2$$x3
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000624388 650_7 $$2Other$$aMaterials Science (cond-mat.mtrl-sci)
000624388 650_7 $$2Other$$aFOS: Physical sciences
000624388 693__ $$0EXP:(DE-H253)F-PL23-20230101$$1EXP:(DE-H253)FLASHII-20150901$$6EXP:(DE-H253)F-PL23-20230101$$aFLASH2$$fFLASH2 Beamline FL23$$x0
000624388 7001_ $$aGupta, D.$$b1
000624388 7001_ $$0P:(DE-H253)PIP1085037$$aWang, R. -P.$$b2$$udesy
000624388 7001_ $$aPavelka, M.$$b3
000624388 7001_ $$aDziarzhytski, S.$$b4
000624388 7001_ $$aSchmising, C. von Korff$$b5
000624388 7001_ $$aJana, S.$$b6
000624388 7001_ $$aThielemann-Kühn, N.$$b7
000624388 7001_ $$aAmrhein, T.$$b8
000624388 7001_ $$aWeinelt, M.$$b9
000624388 7001_ $$aVaskivskyi, I.$$b10
000624388 7001_ $$aKnut, R.$$b11
000624388 7001_ $$aEngel, D.$$b12
000624388 7001_ $$aBraune, M.$$b13
000624388 7001_ $$aIlchen, M.$$b14
000624388 7001_ $$aSavio, S.$$b15
000624388 7001_ $$aOtto, T.$$b16
000624388 7001_ $$aTiedtke, K.$$b17
000624388 7001_ $$aScheppe, V.$$b18
000624388 7001_ $$aRönsch-Schulenberg, J.$$b19
000624388 7001_ $$aSchneidmiller, E.$$b20
000624388 7001_ $$aSchüßler-Langeheine, C.$$b21
000624388 7001_ $$aDürr, H. A.$$b22
000624388 7001_ $$aBeye, M.$$b23
000624388 7001_ $$aBrenner, G.$$b24
000624388 7001_ $$0P:(DE-H253)PIP1008858$$aPontius, N.$$b25$$eCorresponding author
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000624388 9141_ $$y2025
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