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000476742 1001_ $$0P:(DE-H253)PIP1096915$$aFan, Guangyu$$b0
000476742 245__ $$aUltrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source
000476742 260__ $$aWashington, DC$$bOSA$$c2022
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000476742 520__ $$aDevelopment of ultrafast table-top x-ray sources that can map various spin, orbital, and electronic configurations and reordering processes on their natural time and length scales is an essential topic for modern condensed matter physics as well as ultrafast science. In this work, we demonstrate spatiotemporally resolved resonant magnetic scattering (XRMS) to probe the inner-shell 4d electrons of a rare-earth (RE) composite ferrimagnetic system using a bright >200eV soft x-ray high harmonic generation (HHG) source, which is relevant for future energy-efficient, high-speed spintronic applications. The XRMS is enabled by direct driving of the HHG process with power-scalable, high-energy Yb laser technology. The optimally phase-matched broadband plateau of the HHG offers a record photon flux (>2×109photons/s/1% bandwidth) with excellent spatial coherence and covers the entire resonant energy range of RE’s N4,5 edges. We verify the underlying physics of our x-ray generation strategy through the analysis of microscopic and macroscopic processes. Using a CoTb alloy as a prototypical ferrimagnetic system, we retrieve the spin dynamics, and resolve a fast demagnetization time of 500±126fs, concomitant with an expansion of the domain periodicity, corresponding to a domain wall velocity of ∼750m/s. The results confirm that, far from cross-contamination of low-energy absorption edges in multi-element systems, the highly localized states of 4d electrons associated with the N4,5 edges can provide high-quality core-level magnetic information on par with what can be obtained at the M edges, which is currently accessible only at large-scale x-ray facilities. The analysis also indicates the rich material-, composition-, and probing-energy-dependent driving mechanism of RE-associated multicomponent systems. Considering the rapid emergence of high-power Yb lasers combined with novel nonlinear compression technology, this work indicates potential for next-generation high-performance soft x-ray HHG-based sources in future extremely photon-hungry applications on the table-top scale, such as probing electronic motion in biologically relevant molecules in their physiological environment (liquid phase), and advanced coherent imaging of nano-engineered devices with 5∼8nm resolution.
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000476742 7001_ $$aLégaré, K.$$b1
000476742 7001_ $$aCardin, V.$$b2
000476742 7001_ $$0P:(DE-H253)PIP1088740$$aXie, Xinhua$$b3
000476742 7001_ $$aSafaei, R.$$b4
000476742 7001_ $$aKaksis, E.$$b5
000476742 7001_ $$aAndriukaitis, G.$$b6
000476742 7001_ $$0P:(DE-HGF)0$$aPugžlys, A.$$b7
000476742 7001_ $$0P:(DE-HGF)0$$aSchmidt, B. E.$$b8
000476742 7001_ $$aWolf, J. P.$$b9
000476742 7001_ $$0P:(DE-H253)PIP1085164$$aHehn, M.$$b10
000476742 7001_ $$aMalinowski, G.$$b11
000476742 7001_ $$aVodungbo, B.$$b12
000476742 7001_ $$0P:(DE-H253)PIP1027650$$aJal, Emmanuelle$$b13
000476742 7001_ $$0P:(DE-H253)PIP1009070$$aLüning, J.$$b14
000476742 7001_ $$aJaouen, N.$$b15
000476742 7001_ $$0P:(DE-H253)PIP1087131$$aGiovannetti, G.$$b16
000476742 7001_ $$0P:(DE-H253)PIP1023238$$aCalegari, F.$$b17
000476742 7001_ $$0P:(DE-HGF)0$$aTao, Z.$$b18$$eCorresponding author
000476742 7001_ $$aBaltuška, A.$$b19
000476742 7001_ $$aLégaré, F.$$b20
000476742 7001_ $$0P:(DE-H253)PIP1095255$$aBalciunas, Tadas$$b21
000476742 773__ $$0PERI:(DE-600)2779175-0$$a10.1364/OPTICA.443440$$gVol. 9, no. 4, p. 399 -$$n4$$p399 - 407$$tOptica$$v9$$x2334-2536$$y2022
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